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1
Tao, Ziyu, Zihao Hu, Ganming Wu, Conghui Huang, Chao Zou e Zhiyun Ying. "Train-Induced Vibration Predictions Based on Data-Driven Cascaded State-Space Model". Buildings 12, n. 2 (25 gennaio 2022): 114. http://dx.doi.org/10.3390/buildings12020114.
Testo completoAbstract (sommario):
Over-track buildings above metro depots have become common in megacities due to urban land shortages. The transmission of vibrations into the over-track buildings during routine train operations has the potential to adversely impact the occupants in terms of perceptible vibration and noise. There is a need to quantify the potential impacts before construction for planning and design purposes. Train-induced vibration measurements were carried out on a six-story over-track building at the Luogang metro depot in Guangzhou, China, which is located adjacent to the tracks. The measurements were used to develop a data-driven cascaded state-space model, which can be applied to planned over-track buildings located in track areas to predict and assess whether train-induced vibrations would adversely affect the buildings’ future occupants. Vibration levels in the platform of the building’s columns were used as inputs to the models, thereby avoiding the complexity of modeling the transfer behavior of the platform. The predicted vibration levels corresponded with measurements in the existing building. This comparison validated the use of the model for future residential buildings where the predictions indicate that the impacts on its occupants will be within the applicable criteria.
2
Moskovets, Mariya, e Nikolay Kanev. "Assessment of Rail Vibration Transmission from the Ground to the Foundation of a Building". MATEC Web of Conferences 320 (2020): 00005. http://dx.doi.org/10.1051/matecconf/202032000005.
Testo completoAbstract (sommario):
This paper presents the problem of rail transport vibration transmission from the ground to building foundations. Field measurement results of vibration parameters on the ground near buildings and their foundations have been covered in this study. It has been shown that vibrations at the foundation of a building are much smaller than vibrations on the ground. The most intense vibrations on the foundation slab occur in the vertical direction. Comparison with other experimental data on vibration transfer from the ground to buildings structures has been made. The data obtained can be utilized in designing vibration protection measures and to analytically predict vibration effects in buildings. This analysis can be performed after measuring the vibration of rail transport on the ground surface.
3
Kożuch, Barbara, Filip Pachla e Tadeusz Tatara. "Vibrations induced by the passage of trains at various speeds and their effect on the structural response of buildings - an experimental and numerical analysis". MATEC Web of Conferences 211 (2018): 13007. http://dx.doi.org/10.1051/matecconf/201821113007.
Testo completoAbstract (sommario):
This paper presents a selection of vibration measurement results and analyses performed with regard to their harmfulness to residential buildings. The first part of the paper refers to the analysis of railway vibrations measured in situ at the foundation level of residential building. These vibration records were then used to assess the harmfulness of vibrations relating to each train speed. Assessment of the vibration harmfulness of the building was performed with an indicator of the perceptibility of vibration through a structure (WODB), according to the Polish standard. The second part of the study refers to the creation of dynamic models of buildings with the use of the ‘Diana’ software program and analysis of their responses to railway vibrations. The thresholds specified by the standard in any of the train speeds of up to 250 km/h were not exceeded. Nevertheless, propagation of vibrations induced by train passages and their effect on the structural response of buildings is a complex phenomenon. Without in situ measurements, it is hard to assess the impact of induced vibrations on buildings. As proven in the paper, a train moving on a track at various speeds does not uniformly make the vibration greater in each frequency band.
4
Haladin, Ivo, Marijan Bogut e Stjepan Lakušić. "Analysis of Tram Traffic-Induced Vibration Influence on Earthquake Damaged Buildings". Buildings 11, n. 12 (28 novembre 2021): 590. http://dx.doi.org/10.3390/buildings11120590.
Testo completoAbstract (sommario):
The Zagreb 2020 earthquake severely damaged the historic centre of the city. Most of the damage occurred on historic masonry residential buildings, many of which are situated very close to the tram track. Although traffic-induced vibrations generally do not affect surrounding buildings, they can be harmful to buildings damaged by a previous earthquake. Vibrations could contribute to the further propagation of existing cracks. The effect of vibrations depends on many factors, one of the most important being the distance between the track and the building. The vibrations are highest at the source, and the energy loss occurs due to transfer through the soil to the recipients. The impact of tram-induced vibrations on earthquake-damaged buildings in the city of Zagreb is investigated in this paper. The analysis is conducted on a tramway network scale to identify critical locations by performing continuous monitoring on the tramway network and risk analysis based on the distance of buildings from the track, vibration amplitude at source, and building damage. Further investigation is based on the level of buildings to evaluate the influence of vibrations on actual buildings damaged in the Zagreb earthquake. Based on detailed signal analysis, the vibration characterization is performed, and the influence on damaged masonry buildings is evaluated.
5
Moskovets, Mariya, e Nikolay Kanev. "Transmission of Railway Induced Vibrations in Buildings". MATEC Web of Conferences 320 (2020): 00003. http://dx.doi.org/10.1051/matecconf/202032000003.
Testo completoAbstract (sommario):
This paper presents the problem of vibration transmission in building structures, which is induced by rail transport, and it discusses the effect of acoustic isolation used at the foundation. The vibration sources generate acoustic waves which are transmitted to the foundation and propagate trough the floors and slabs of the building. The transmission coefficients of the acoustic waves induced by metro trains and trams were determined in the building foundation and slabs. It was shown that mechanical resonances have a significant influence on the vibrations of the slabs. The characteristics of vibration propagation through vibration-insulated floors were found. Using the data obtained in this study, vibration effects in buildings located near vibration sources can be estimated, vibration protection measures can be developed.
6
Zou, Chao, Yimin Wang e Ziyu Tao. "Train-Induced Building Vibration and Radiated Noise by Considering Soil Properties". Sustainability 12, n. 3 (27 gennaio 2020): 937. http://dx.doi.org/10.3390/su12030937.
Testo completoAbstract (sommario):
Constructing buildings above subway tracks exploits urban-area space intensively by adopting the three-dimensional overlapping development mode, which is one of the important measures for solving the contradictions among urban population increase, land resource shortage, and environmental protection. However, the vibration generated by the frequent train operations is transmitted to the upper buildings through the track structure and ground soil, which can cause structural vibrations and radiated noise and bring physical and mental side effects to occupants within the buildings. Subway projects are often located in geologically sensitive areas, while the influences of the encountered geological problems on the generation and propagation of structural vibration and structure-radiated noise within the buildings are not yet clear. Hence, this paper presents a method of studying the train-induced vibration transmission from the ground up into the buildings and the structure-radiated noise within the building. The method consists of a train-track model, track-soil-building model, and structure-radiated noise simulation. The impact of soil properties on the building vibration and structure-radiated noise is analyzed and ground-improvement measures are proposed in order to mitigate vibration and structure-radiated noise within buildings. The results show that the interaction between soil and structure has a great impact on vibration transmission from the ground into the building. Good foundations reduce vibration transmission from ground soil up into the building and lead to a lower level of structure-radiated noise. Ground improvements increase the impedance of ground soil, thereby weakening the vibration transmission and lowering the structure-radiated noise.
7
Feher, Jan, Jozef Cambal, Blazej Pandula, Julian Kondela, Marian Sofranko, Tawfik Mudarri e Ivan Buchla. "Research of the Technical Seismicity Due to Blasting Works in Quarries and Their Impact on the Environment and Population". Applied Sciences 11, n. 5 (27 febbraio 2021): 2118. http://dx.doi.org/10.3390/app11052118.
Testo completoAbstract (sommario):
Vibrations caused by blasting works have an impact not only on buildings but also the internal environment of the buildings. If these buildings are situated in the surroundings of quarries, the citizens can perceive these vibrations negatively. By applying an appropriate millisecond timing interval, it is possible to lower the intensity of vibrations to the levels that the citizens will not perceive as negative effects inside the buildings. The limit values for this vibration intensity have not been defined to date. For the protection of the building from the vibrations, normative values of the particle velocity and frequency were determined. Hygienic standards for the inhabitants of the housing were applied, which assessed the impact of the vibration on humans through the measurement of the vibration acceleration in the housing. In this article, the results of the research carried out in Trebejov Quarry are presented. The experimental blasts carried out in Trebejov Quarry proved that the reduction in the vibration intensity under the value 2 mm.s−1 led to the satisfaction of the inhabitants.
8
Erkal, Aykut, Debra Laefer, Paul Fanning, Eser Durukal, Ufuk Hancilar e Yavuz Kaya. "Investigation of the Rail-Induced Vibrations on a Masonry Historical Building". Advanced Materials Research 133-134 (ottobre 2010): 569–74. http://dx.doi.org/10.4028/www.scientific.net/amr.133-134.569.
Testo completoAbstract (sommario):
Increasingly historic masonry buildings are subjected to higher levels of traffic and rail vibrations due to urbanization and population growth. Deterioration and destabilisation of these buildings may result, especially if they were previously damaged (e.g. earthquakes or settlement problems). To better understand building response, vibration measurements were conducted on the Little Hagia Sophia Mosque, located adjacent to Istanbul’s Sirkeci-Halkali railway line. Transport-induced vibrations were recorded at several points on the ground and building. Attenuation characteristics in the ground and amplification features on the building were examined. Peak particle velocities often exceeded previously established thresholds for human perception and in some cases for structural damage. These are evaluated with respect to the building’s condition.
9
Vogiatzis, Konstantinos, e Harris Mouzakis. "Ground_borne noise and vibration transmitted from subway networks to multi_storey reinforced concrete buildings". Transport 33, n. 2 (4 settembre 2017): 446–53. http://dx.doi.org/10.3846/16484142.2017.1347895.
Testo completoAbstract (sommario):
During the operation of urban subway rail transit systems, vibrations are generated that transmitted through the soil, induce vibrations in nearby buildings. The transmission of ground-borne vibrations from subway rail transit systems in a building is governed by the soil-foundation interaction, the reduction of vibration level between floors, and the amplication due to resonances of building elements. These are influenced by the type of the building, its construction materials, the foundation soil, and the frequency content of the excitation. A methodology is proposed for the determination of the sound vibration along the height of the building for a specic construction type, demonstrating how the attenuation and amplication parameters can be calculated. For this particular building type, a notable amplication of the vibration due to floor and other structural resonances was found, whereas the vibration and hence the radiated noise levels are similar from the first floor up. An overall building amplication factor is proposed, taking into account all the above mentioned transmission mechanisms.
10
Kłosak, Andrzej, Alicja Kowalska-Koczwara, Filip Pachla, Krzysztof Stypuła, Tadeusz Tatara e Bogusław Zając. "Proposal of new vibro-acoustic floor". MATEC Web of Conferences 211 (2018): 10001. http://dx.doi.org/10.1051/matecconf/201821110001.
Testo completoAbstract (sommario):
Human perception of vibration could be the basic parameter in designing a new buildings located close to public transport. It is also one of parameter that is considered in diagnosis of building vibration. People perceived vibrations through the floor. The problem of floor vibration appear especially in old historical buildings with wooden floor when source of transport vibration change because of infrastructure development. During years road, tramway or railway infrastructure is more expanded that it was when the old buildings were built. That is why new solutions of protection against noise and vibration are needed. One of that kind solution could be vibro-acoustic floor which can reduce impact sounds and vibrations. A flooring system that insulates both acoustically and vibrantly is a common solution to reduce noise coming from impact sounds or to propagate from lower levels to higher ones and to limit the influence of vibration on people receiving vibration in buildings passively. The flooring system should therefore be capable to damp vibrations up to 100 Hz and have sound insulation of min. 25 dB. The composition of vibration insulation materials and their material parameters will be selected to optimize the acoustic and vibration protection. At the same time, the acoustic and vibration-insulating flooring system should have all the functional features that are common to the floor: ease of installation and adequate rigidity. In paper three types of vibro-acoustic floors will be considered: with full vibro-insulation, with insulation strips and with point insulation. Advantages and disadvantages of these three considered solutions will be presented. The paper is pilot study to in-situ measurement which will be held under the project of EU commission support.
11
Smirnov, V. A. "Protection of Bearing Structures of Buildings Against the Influence of Vibration Generated by Railway Transport". Zhilishchnoe Stroitel'stvo, n. 12 (2020): 40–46. http://dx.doi.org/10.31659/0044-4472-2020-12-40-46.
Testo completoAbstract (sommario):
Currently, the railway network is widely developed, many of which pass through settlements and cities; in some proximity to buildings, including high-rise buildings. The movement of trains on the track causes a certain level of vibrations that are transmitted through the ground to nearby buildings, and cause vibrations of various structures. In this regard, when designing railway tracks or constructing buildings in some proximity to railways, it is necessary to assess the possible vibration impact of rail transport on structures at the design stage and, if necessary, provide measures to protect buildings from negative vibration effects. However, to date, there has not been a standardized method for determining the vibration level at the design stage. The method of predicting the vibration impact of railway transport presented in the article will make it possible to estimate the degree of vibration impact of railway transport on buildings and structures at the design stage, and, if necessary, develop design solutions for vibration isolation that protect buildings and structures from negative vibration effects and create acoustic comfort conditions in the premises.
12
Stypuła, Krzysztof. "Practical aspects of applying the principles of environmental protection against vibrations in the process of preparation and implementation of railway investment". Transportation Overview - Przeglad Komunikacyjny 2019, n. 8 (1 agosto 2019): 1–12. http://dx.doi.org/10.35117/a_eng_19_08_01.
Testo completoAbstract (sommario):
Both in the case of reconstruction (modernization) of existing railway lines and construction of new ones - it is necessary to take into account the impact of these investments on the environment. One of such influences are vibrations caused by train passing. Vibrations transmitted to the building through the ground have an impact on: the construction of the buildings, the people staying in them and the vibration-sensitive devices if they are in the building. These receipts are not always sufficiently included in environmental documents. This issue often raises a number of doubts. The paper presents the basis for the assessment of the vibration effects mentioned above. Then the following is presented: an algorithm to take into account these influences at the stage of preparation and design and implementation of railway investments, the problem of determining the extent of zones of dynamic impact from the operation of the railway line, indications regarding the typing of representative buildings, rules for performing pre-realization tests of the impact of vibrations on representative buildings and on people in these buildings (dynamic background measurements) and the principles of post-implementation measurements, the problem of forecasting the impact of vibrations on representative buildings and on people in these buildings. It also presents some remarks about problems of protection of neighboring buildings against vibrations from construction works related to the implementation of investments.
13
Maciag, Edward, Krystyna Kuzniar e Tadeusz Tatara. "Response Spectra of Ground Motions and Building Foundation Vibrations Excited by Rockbursts in the LGC Region". Earthquake Spectra 32, n. 3 (agosto 2016): 1769–91. http://dx.doi.org/10.1193/020515eqs022m.
Testo completoAbstract (sommario):
Surface vibrations induced by mining rockbursts resulting from underground exploitation in the mines in western Poland were analyzed and classified into three different categories. Comparison of the accelerograms simultaneously recorded on the ground and on the foundations of typical buildings, as well as the response spectra determined on the basis of these records, leads to the conclusion that ground vibration characteristics have a significant influence on the nature of vibration transmission from the ground to the building foundation. Analysis of the response spectra, separately determined from both ground vibrations and building foundation vibrations, indicates that the standard response spectrum based on building foundation vibrations is more useful in the design of new buildings in areas of mining tremors than the spectrum based on ground vibrations. Moreover, the usefulness of the models of soil-structure interaction based on seismic data in California was investigated with respect to mine-induced rockbursts in Poland.
14
Chen, Fan, Gengsheng He, Shun Dong, Shunjun Zhao, Lin Shi, Xian Liu, Baichuan Zhang, Ning Qi, Shenggui Deng e Jin Zhang. "Space-Time Effect Prediction of Blasting Vibration Based on Intelligent Automatic Blasting Vibration Monitoring System". Applied Sciences 12, n. 1 (21 dicembre 2021): 12. http://dx.doi.org/10.3390/app12010012.
Testo completoAbstract (sommario):
The vibration produced by blasting excavation in urban underground engineering has a significant influence on the surrounding environment, and the strength of vibration intensity involves many influencing factors. In order to predict the space-time effects of blasting vibration more accurately, an automatic intelligent monitoring system is constructed based on the rough set fuzzy neural network blasting vibration characteristic parameter prediction model and the network blasting vibrator (TC-6850). By setting up the regional monitoring network of monitoring points, the obtained monitoring data are analyzed. An artificial intelligence model is used to predict the influence of stratum condition, excavation hole, and high-rise building on blasting vibration velocity and frequency propagation. The results show that the artificial intelligence prediction model based on a rough set fuzzy neural network can accurately reflect the formation attenuation effect, hollow effect, and building amplification effect of blasting vibration by effectively fuzzing and standardizing the influencing factors. The propagation of blasting vibration in a soil–rock composite stratum is closely related to the surrounding rock conditions with a noticeable elastic modulus effect. The hollow effect is regional, which has a significant influence on the surrounding ground and buildings. Besides, the blasting vibration of the excavated area is stronger than that of the unexcavated area. The propagation of blasting vibration on high-rise buildings was complicated, of which the peak vibration velocity is maximum at the lower level of the building and decreased with the rise of the floor gradually. The whip sheath effect appears at the top floor, which is related to the blasting vibration frequency and the building’s natural vibration frequency.
15
Cheng, Ming Hei, e Thomas H. Heaton. "Simulating Building Motions Using Ratios of the Building's Natural Frequencies and a Timoshenko Beam Model". Earthquake Spectra 31, n. 1 (febbraio 2015): 403–20. http://dx.doi.org/10.1193/011613eqs003m.
Testo completoAbstract (sommario):
A simple prismatic Timoshenko beam model with soil-structure interaction (SSI) is developed to approximate the dynamic linear elastic behavior of buildings. A closed-form solution with complete vibration modes is derived. It is demonstrated that building properties, including mode shapes, can be derived from knowledge of the natural frequencies of the first two translational modes in a particular direction and from the building dimensions. In many cases, the natural frequencies of a building's first two vibrational modes can be determined from data recorded by a single seismometer. The total building's vibration response can then be simulated by the appropriate modal summation. Preliminary analysis is performed on the Caltech Millikan Library, which has significant bending deformation because it is much stiffer in shear.
16
Ko, J. M., S. T. Luk e C. Y. Cheng. "Pile-driving Induced Vibration and its Transmission to Buildings". Journal of Low Frequency Noise, Vibration and Active Control 11, n. 3 (settembre 1992): 76–88. http://dx.doi.org/10.1177/026309239201100302.
Testo completoAbstract (sommario):
The paper reports a case study of pile-driving induced vibration and its transmission to buildings which was carried out in the construction site of the Phase IV development of the Hong Kong Polytechnic. Ground vibration caused by driving prestressed concrete tubular piles using a diesel hammer in the. reclaimed site are measured and analysed. Vibrations transmitted from the driving source to a concrete pavement, a two-storey building with shallow foundation and an eight-storey building with deep foundation are also measured and analysed The results are discussed and compared with those given by other researchers.
17
Et. al., M. Vishnu Vardhana Rao,. "A Machine Learning-based Damage Prediction Techniques for Structural Health Monitoring". Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, n. 2 (10 aprile 2021): 3392–405. http://dx.doi.org/10.17762/turcomat.v12i2.2401.
Testo completoAbstract (sommario):
Nowadays, the Structural Building Health Damage Monitoring System (SBHDMS) is a crucial technology for predicting the civil building structures' health. SBHDMS contains abnormal changes in the buildings in terms of damage levels. Natural Disasters like Earthquakes, Floods, and cyclones affect the unusual changes in the buildings. If the building undergoes any natural disaster, the sensors capture the vibration data or change the buildings' structure. Due to the vibration data, these unusual changes can be analyzed. Here sensors or Machine Learning based Building Damage Prediction (MLBDP) are used for capturing and collecting the vibration data. This paper proposes a Novel Rough Set based Artificial Neural Network with Support Vector Machine (RAS) metaheuristic method. RAS method is used to predict the damaged building's vibration data levels captured by the sensors. For the feature reduction subset, we use one of the essential pre-processing method called the Rough set theory (RST) strategy. RAS has two contributions. The first one is the Support Vector Machine (SVM) classification method used for identifying the structures of the buildings. The artificial Neural Network (ANN) method used to predict the buildings' damage levels is the second contribution. The proposed method (RAS) is accurately predicting the conditions of the construction building structure and predicting the damage levels, without human intervention. Comparing the results states that the proposed method accuracy is better than SVM's classification methods, ANN. The prediction analysis depicts that the RAS method can effectively detect the damage levels.
18
Mangushev, R. A., A. V. Gurskiy e V. M. Polunin. "ESTIMATION OF DYNAMIC EFFECTS FROM VIBRATION DIPPING OF SHEET PILES ON ENVIRONMENTAL BUILDINGS IN CONDITIONS OF WEAK WATER-SATURATED SOILS". Construction and Geotechnics 11, n. 3 (15 dicembre 2020): 102–16. http://dx.doi.org/10.15593/2224-9826/2020.3.09.
Testo completoAbstract (sommario):
In weak, structurally unstable soils, the use of the technology of high-frequency vibration immersion of sheet piles, in some cases, is obviously dangerous, and the issue of assessing the limits of applicability of this technology in certain conditions is relevant. The assessment of the dynamic impact on the soil foundation can be made by the level of vibrations. Regulatory documents impose requirements on the level of vibrations of the surrounding soil mass and buildings, however, it is not entirely correct to assess the influence of the technology of high-frequency vibration driving of sheet piles only by the values of vibration acceleration and vibration velocity. The object of the study is the values of deformations of foundations reinforced with piles. At the experimental construction site, we were carried out for the level of vibrations of foundations reinforced with piles 18 m length, from high-frequency vibration immersion of a pipe sheet pile with a diameter of 1200 mm and a length of 18 m. In the process of driving the sheet piles, we were making constant geodesic control over the deformations of adjoining buildings was carried out. The main results are: the example given in the article shows that when the foundations are strengthened, the deformations of the foundation (settlement) remain within the permissible values, despite the significant excess of the permissible level of vibrations of the building foundations. The proposed methodology for the numerical prediction of base deformations from vibration immersion of sheet piles gives satisfactory convergence with the results of field observations and makes it possible to assess qualitatively and quantitatively the settlements of buildings in the surrounding development from vibration immersion / extraction of sheet piles at the preliminary stages of construction.
19
Lin, Jui-Liang, Keh-Chyuan Tsai e Yi-Jer Yu. "Coupled Tuned Mass Dampers for the Seismic Control of Asymmetric-Plan Buildings". Earthquake Spectra 26, n. 3 (agosto 2010): 749–78. http://dx.doi.org/10.1193/1.3435347.
Testo completoAbstract (sommario):
An innovative tuned mass damper, referred to as a coupled tuned mass damper (CTMD), is proposed for the control of a coupled vibration mode of one-way asymmetric-plan buildings. The CTMD simultaneously translates and rotates almost resonantly with the vibration of the controlled mode, which actually vibrates in translation, as well as rotation. Thus, the CTMD can be viewed as a direct approach for controlling the modal vibration of asymmetric-plan buildings. First, the CTMD is developed from the two-degree-of-freedom modal system, which has one active and one spurious vibration frequency. It is illustrated that the optimum parameter values of the CTMD can be conveniently determined from those of the corresponding tuned mass damper (TMD). Second, in order to apply the CTMD to a building structure, the properties of the CTMD obtained in the modal space are transformed into the physical space. Finally, the effectiveness of the CTMD in reducing the vibrations of asymmetric-plan structures is verified by investigating the frequency response functions and the response histories of three eight-story asymmetric-plan buildings with and without dampers. These three buildings are respectively torsionally stiff, torsionally similarly stiff, and torsionally flexible. This study confirms that the CTMD is an effective alternative for the seismic control of asymmetric-plan buildings.
20
Gaile, Liga, e Ivars Radins. "EVALUATION OF VIBRATION-BASED GLOBAL STRUCTURAL HEALTH MONITORING METHOD FOR MEDIUM-RISE BUILDINGS". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (16 giugno 2021): 55–61. http://dx.doi.org/10.17770/etr2021vol1.6598.
Testo completoAbstract (sommario):
The automated monitoring of a building’s structural health during its exploitation is a way to extend its design life without compromising structural safety. In turn, it helps increase the rate of building renovation works compared to demolition works, which reduces future construction and demolition waste levels.This research explores the vibration-based global monitoring method application to structurally stiff medium-rise reinforced concrete buildings by analysing predicted building vibration amplitudes and spectrum under regular city traffic excitation. These predictions are based on the results obtained from finite element calculations of building models with variated structural stiffness and inertial mass of the building.Regular traffic-generated ground frequency spectrum differs from the first natural frequencies of medium-rise reinforced concrete buildings, and the vibration energy is low. Nevertheless, it is found that the structural identification of such building dynamic parameters is still possible, particularly natural frequencies. It was found that the ratio between fundamental frequency for the fixed base model of the building and elastic spring foundation model is the decisive parameter for selecting the building part to be monitored. Structural health monitoring vibration-based methods are also a promising technology for medium-rise mass house buildings when tailored according to some damage sensitive feature.
21
Stolarik, Martin, Miroslav Pinka e Jan Nedoma. "Ground-Borne Vibration Due to Construction Works with Respect to Brownfield Areas". Applied Sciences 9, n. 18 (9 settembre 2019): 3766. http://dx.doi.org/10.3390/app9183766.
Testo completoAbstract (sommario):
Ground-borne vibration caused by mechanized construction works is the most common problem in built-up areas in general. In post-industrial cities, there are many building facilities in the category of brownfields. Parts of these buildings are often technically and culturally valuable buildings with varying degrees of decay. These are very susceptible to vibrations. The revitalization of brownfield areas employs a wide range of works and practices, among which are those that have adverse effects in the form of vibrations and shocks. This paper presents a theoretical study and original results concerning the seismic load on historical and dilapidated buildings in brownfield areas due to the ground-borne vibration caused by mechanized construction works. Original data from seismic measurements are related to the post-industrial Ostrava agglomeration, in the area of one of the biggest successfully revitalized brownfields in Central Europe. All measurements were evaluated in terms of both amplitude and frequency. The results of all measurements were processed in the form of attenuation curves.
22
Benčat, Ján, e Juraj Koňár. "Dynamic Response of Buildings and Structures due to Microtremor Part 2: Construction Works – Pile Driving Effects". Advanced Materials Research 969 (giugno 2014): 133–39. http://dx.doi.org/10.4028/www.scientific.net/amr.969.133.
Testo completoAbstract (sommario):
Operation of construction equipment causes ground vibrations which spread through the ground and diminish in strength with distance. The construction vibrations should be reduced by planed and controlled use of construction machinery. We studied the effect of the construction vibration in the Bratislava Airport buildings caused by sheet piles driving near the operated Airport building and site of new terminal building.
23
Qian, Xia, e Qu Wen-Jun. "Experimental and Numerical Studies of Metro Train-Induced Vibrations on Adjacent Masonry Buildings". International Journal of Structural Stability and Dynamics 16, n. 10 (dicembre 2016): 1550067. http://dx.doi.org/10.1142/s0219455415500674.
Testo completoAbstract (sommario):
This paper studies the subway-induced vibrations on two adjacent masonry structures in Shanghai with focus on the vibration level and frequency. The results show that: (1) the vibration levels of the two masonry structures in three directions are all higher during the peak traffic hours than the off-peak hours and are higher in the daytime than at night. In addition, they are higher at the mid-span of the floor than the wall-floor junctions and staircase. (2) The parameters of the numerical model were calibrated by the measured vibration response. The slab properties, room size, and other factors can affect the vibration response distribution. (3) The vertical vibrations in the rooms with precast slab are greater than those with cast-in-situ slab. The vertical vibrations at the ash seam between the precast slabs are amplified. In addition, the room depth has a small effect on the vibration intensity. The relationship between the room depth and the vibration intensity depends on the relative width and depth of the room. (4) The width of the room has a significant effect on the vertical vibration. The floor corner and surrounding wall constraint conditions greatly affect the vibration intensity.
24
He, Ru, Nan Jiang, Dong-Wei Li e Jian-Feng Qi. "Dynamic Response Characteristic of Building Structure under Blasting Vibration of underneath Tunnel". Shock and Vibration 2022 (4 gennaio 2022): 1–13. http://dx.doi.org/10.1155/2022/9980665.
Testo completoAbstract (sommario):
The vibration induced by blasting excavation of the subway tunnel in complex urban environments may cause harmful effects on adjacent buildings. Investigating the dynamic response of adjacent buildings is a key issue to predict and control blasting hazards. In this paper, the blasting excavation of the subway tunnel right below a building was selected as a case study, and the blast vibrations in the field were monitored. The Hilbert–Huang Transform (HHT) model was used to extract and analyze the time-frequency characteristic parameters of blasting dynamic response signals. By substituting intrinsic mode functions (IMF) component frequency and instantaneous energy for main frequency and blasting total input energy, respectively, the characteristics of time-instantaneous frequency-instantaneous energy of buildings under blasting seismic load were analyzed, and the concept of effective duration of vibration was proposed.
25
Buijs, J. H. N. "The Susceptability of Computers to Vibration". Journal of Low Frequency Noise, Vibration and Active Control 11, n. 1 (marzo 1992): 23–32. http://dx.doi.org/10.1177/026309239201100104.
Testo completoAbstract (sommario):
The computer is now used in many kinds of building. When building contractors are constructing nearby, the vibration sensitivity of disk drives can be a problem. If computers are of vital importance in a production process, the consequences of a possible break-down and information loss because of vibrations cannot be neglected or underestimated. In this paper the information needed to judge the possible risks of damage in practice is discussed The information given by computer manufacturers is, in general, neither complete nor unequivocal. Furthermore, results of vibration measurements in buildings are presented and discussed. Exposure to low frequency vibrations caused by different building activities such as demolition by means of pneumatic drills, driving in sheet piles and last, but not least, driving in piles made of concrete or steel using impact driving techniques are considered. The most sensitive parts of a computer mainframe, the disk drives, in general produce more vibration themselves during read or write operations than that permitted by the computer manufacturer. Although the vibrations caused by building activities are in most cases significantly lower than the computer limits, several cases of breakdown or information loss have occurred. Who is responsible for computer damage?
26
Kowalska-Koczwara, Alicja, e Filip Pachla. "Transmission of transport vibrations from the ground to the building - case study". MATEC Web of Conferences 313 (2020): 00018. http://dx.doi.org/10.1051/matecconf/202031300018.
Testo completoAbstract (sommario):
Transport vibrations are transmitted from the ground the foundations and building walls to the building and received by its construction and by people in the buildings. During the vibration of buildings, inertia forces generate an additional (apart from the static one) loading of the structure. In the diagnosis and design of buildings, these forces are taken into account by analyzing the requirements for stiffness and strength of the building structure. Exceedance of these requirements may lead to accelerated wear and even structural damages of the building. In this paper a simple relationship between ground and building vibration was made. The building chosen for analysis is light-weight wooden building located close to Cracow near Zakopianka road. What is worth noting that building is so called passive building. The excitation which was simulated on the dynamical polygon was car (bus) and truck lorry passages. The sensors were accelerations in three orthogonal directions, one sensor was placed about 2.5 m far from the building and the second on the foundation wall. The different types of excitation were compared and the conclusion from the analysis was made.
27
Liu, Pei, Peng-Yu Lian e Wei-Guo Yang. "Horizontal Resonance of a 13 Story Building Under External Machine Vibrations". International Journal of Structural Stability and Dynamics 18, n. 01 (gennaio 2018): 1850005. http://dx.doi.org/10.1142/s0219455418500050.
Testo completoAbstract (sommario):
Excessive vibrations seriously affected the comfort of residents living on the upper floors of a high-rise shear walled building in Beijing. The ambient vibration tests were conducted to measure the floor acceleration responses, which were found to contain almost periodic signals likely to be excited by vibration sources with frequency of about 1.5[Formula: see text]Hz. The transverse vibration levels of the building above the 8th floor are not acceptable as revealed by the one-third octave spectra and weighted acceleration levels according to the ‘Standard for Allowable Vibration of Building Engineering’ of China. The modal properties of the building are identified by a Bayesian FFT method, indicating that the resonance between the building and the vibration sources caused the excessive vibrations. For comparison, the vibration test of an adjacent building with the same structural design was also conducted, together with modal analysis by the finite element method. It is found that as the story level increases, different trends of amplification in floor root mean square (RMS) acceleration and mode shape component of the two buildings cause different vibration levels. After tests outside the residence community, the main vibration sources were identified to be the working machines in two stone processing factories a few hundred meters away from the building. The vibration tests with measurements in the building and near the vibration sources with different number of machines in the two factories were also conducted. The results show that the vibration levels of the building can be controlled below the acceptance value by reducing the number of machines.
28
Chen, Fa Ben. "Experimental Study on the Effect of Vibration of Pile Foundation Construction". Applied Mechanics and Materials 711 (dicembre 2014): 392–96. http://dx.doi.org/10.4028/www.scientific.net/amm.711.392.
Testo completoAbstract (sommario):
Impact drill holes into the pile construction technology is widely used in pile foundation construction job, construction vibrating pile thus to bring the impact of the increasingly prominent on the surrounding environment, the impact of this article on the construction site of a pile of drilled hole pile construction vibration effects on the surrounding environment experiment monitored by the monitoring data analysis found that the peak acceleration increases with distance attenuation occurs quickly, on the basis of analysis of pile foundation construction vibration velocity, frequency, and duration of the impact on the surrounding buildings, it is found that the frequency of vibration velocity with less impact on the housing, the duration of the construction will have an impact. Finally, analysis of the impact acceleration caused by the building structure from the perspective of seismic intensity, vibration intensity was found equivalent vi degree seismic intensity of little effect on the surrounding structures. Furthermore, the greatest impact of vibration on the residential buildings, by the way of excavating vibration attenuation ditch to control effect of vibration is proposed.
29
Hunt, H. E. M. "Transmission of Vibration into Vibration-Isolated Buildings". Journal of Low Frequency Noise, Vibration and Active Control 10, n. 3 (settembre 1991): 72–77. http://dx.doi.org/10.1177/026309239101000301.
Testo completo
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Zhang, J. W., e Q. S. Li. "Mitigation of Wind-Induced Vibration of a 600m High Skyscraper". International Journal of Structural Stability and Dynamics 19, n. 02 (febbraio 2019): 1950015. http://dx.doi.org/10.1142/s0219455419500159.
Testo completoAbstract (sommario):
The serviceability of super-tall buildings depends primarily on the wind-induced structural responses, especially accelerations. To mitigate the discomforting structural vibrations, pendulum-type tuned mass damper (TMD) systems are commonly employed in high-rise buildings. However, for a super-tall building with a considerably low fundamental natural frequency, the suspension length of a pendulum-suspended TMD (PTMD) becomes too long to be feasible as it would occupy substantial building space. For the sake of saving valuable space in a super-tall building, a multistage PTMD system is recommended for vibration control. This paper presents a detailed assessment study on the performance of a multistage PTMD system designed for a 600 m high skyscraper located in a typhoon-prone region in China. Wind tunnel tests are first conducted to determine the wind loads on the building for estimation of structural dynamic responses for the scenarios with and without installation of the multistage PTMD system. Optimal design of the multistage PTMD system is then carried out through examining the mitigation efficiency of the PTMD system for a variety of mass and damping ratios. To restrict the strokes of mass dampers in the PTMD system, two-section damping strategy is proposed. The assessment results demonstrate that the multistage PTMD system with two-section damping can function efficiently to suppress the excessive vibrations of the skyscraper, while occupying a minimal space in vertical and horizontal directions. This paper aims to provide an effective and economic design strategy for vibration control of super-tall buildings under wind excitations.
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Stypuła, Krzysztof, e Krzysztof Kozioł. "Metro in Warsaw as an example of protection against vibration in the process of rail transport infrastructure creation". Transportation Overview - Przeglad Komunikacyjny 2016, n. 4 (1 aprile 2016): 13–21. http://dx.doi.org/10.35117/a_eng_16_04_02.
Testo completoAbstract (sommario):
The work addresses the problem of environmental protection against vibration caused by rail transport considered in the stage of preparation and design of rail transport infrastructure. In the example the subway in Warsaw, guidelines and standards for assessing the impact of vibration on buildings and people in these buildings were indicated. We presented procedures for protection against vibrations in the case of the rail transport and discussed kinds of analyses of the impact of vibration on structures of buildings and people staying in them. We also described the design procedure of vibroisolation in the structure of the rail track.
32
Egorov, Vladimir, e Grigory Belyy. "Nonlinear properties of hybrid construction of coatings of buildings and structures". E3S Web of Conferences 217 (2020): 01001. http://dx.doi.org/10.1051/e3sconf/202021701001.
Testo completoAbstract (sommario):
Stress and strain state of hybrid (combined) systems including flexible and rigid elements is studied in the article. Theoretical approach is presented. The feature of the systems studied is described, i.e. structural nonlinearity. Numerical analysis is presented. It is pointed out that vibrations of such structures upon conditions of resonance differ from those of classical bar structures, i.e. if for rigid bar systems the amplitudes of vibration at resonant disturbance increase monotonously, in combined (hybrid) system alternate switching off tie-bars stabilizes the amplitude of vibration at a certain value and transfers vibrations in the beating mode that can be considered as an internal vibration absorber.
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Okafor, Chinedum Vincent. "Finite Element Analysis of Vortex Induced Responses of Multistory Rectangular Building". European Journal of Engineering Research and Science 3, n. 2 (25 febbraio 2018): 35. http://dx.doi.org/10.24018/ejers.2018.3.2.612.
Testo completoAbstract (sommario):
High-rise buildings may experience high levels of vibrations under the actions of wind which cause building motions, adversely affecting serviceability and occupant comfort. The paper analyzed the vortex shedding responses of a multistory building with moment resisting frame. It presents a numerical model based on computational wind engineering technique to simulate the wind action over a typical high-rise building using wind speed data of Lagos state Nigeria. The vortex shedding frequency of the vortices and the natural frequency of vibration of the entire high-rise building structural system were calculated by computing fast Fourier transform algorithm (FFT) of the force coefficient and finite element analysis (FEA) of the structural system respectively. From the result obtained, the vortex shedding frequency of the wind vortices was lower than the fundamental frequency of vibration of the typical high-rise building. Hence, vortex shedding was not responsible for the failure of high-rise buildings in the locality being considered due to the reasons stated in the author’s conclusion.
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Okafor, Chinedum Vincent. "Finite Element Analysis of Vortex Induced Responses of Multistory Rectangular Building". European Journal of Engineering and Technology Research 3, n. 2 (25 febbraio 2018): 35–42. http://dx.doi.org/10.24018/ejeng.2018.3.2.612.
Testo completoAbstract (sommario):
High-rise buildings may experience high levels of vibrations under the actions of wind which cause building motions, adversely affecting serviceability and occupant comfort. The paper analyzed the vortex shedding responses of a multistory building with moment resisting frame. It presents a numerical model based on computational wind engineering technique to simulate the wind action over a typical high-rise building using wind speed data of Lagos state Nigeria. The vortex shedding frequency of the vortices and the natural frequency of vibration of the entire high-rise building structural system were calculated by computing fast Fourier transform algorithm (FFT) of the force coefficient and finite element analysis (FEA) of the structural system respectively. From the result obtained, the vortex shedding frequency of the wind vortices was lower than the fundamental frequency of vibration of the typical high-rise building. Hence, vortex shedding was not responsible for the failure of high-rise buildings in the locality being considered due to the reasons stated in the author’s conclusion.
35
Bulat, A. F., A. S. Kobets, V. I. Dyrda, V. A. Lapin, N. G. Marienkov, N. I. Lisitsa e G. N. Agaltsov. "Some problems vibration and protection of buiding and structures using blocks". Bulletin of Kazakh Leading Academy of Architecture and Construction 79, n. 1 (30 marzo 2021): 177–86. http://dx.doi.org/10.51488/1680-080x/2021.1-23.
Testo completoAbstract (sommario):
The basic concept of vibration and seismic insulation of buildings and structures based on the use of rubber seismic blocks (RSB) is considered. The concept of seismic isolation of structures is very relevant. In Japan, New Zealand, France, Greece, England, the United States and a number of other countries, it has been successfully used to protect such important structures as nuclear power plants, schools, bridges, museums, administrative and residential buildings from earthquakes. In Ukraine, the concept developed in two ways: the development of seismic isolation blocks for earthquake protection of residential buildings; development of vibration isolation blocks for vibration protection of heavy equipment (weight up to 300 tons, used in Russia, Ukraine) and residential buildings. For the practical application of building seismic isolation systems by the N. S. Geotechnical Mechanics Institute. Experimental studies were carried out to substantiate the RSB parameters, their designs were patented, design documentation was developed and experimental samples of three types of rubber-metal seismic protection blocks with a diameter of 400 mm and 500 mm and a total height of the rubber layer: 2 120 120 mm, 2х70 mm and 2х50 mm were made. The results of the calculation of a rubber-metal seismic support used as an element of vibration-seismic protection of multi-storey residential buildings are presented. The calculation results obtained by approximate analytical methods are compared with experimental data for samples of seismic supports. The design of a pile with vibration-insulating rubber supports is considered. The developed and tested RSB structures were used for vibration protection against metro trains and vehicles of residential buildings in Kiev: a 10-section 10-storey residential building on Kikvidze Street, three 27-storey buildings on Obolonsky Avenue and a residential complex of three houses in Lviv. Vibration and seismic isolation with the help of RSB provides the natural vibration frequency of the building in the horizontal plane of less than 1 Hz, which meets the requirements of the DBN and Eurocode 8 for the design of the building seismic isolation systems.
36
Hu, Jiang Chun, Ya Dong Bian e Hong Fang Wang. "The Vibration Affects the Adjacent Sensitive Building and its Control Countermeasures". Advanced Materials Research 163-167 (dicembre 2010): 4058–63. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4058.
Testo completoAbstract (sommario):
In order to forecast the vibration affecting the nearby buildings, the analysis methods that the adjacent buildings are influenced due to the construction vibration are researched in the paper. The highway vibration affecting the near chimney is taken as an example. The curve of characteristics seismic coefficient is used as response spectrum. The max values of ground velocity and acceleration come from the vibration roller parameters. The effect range of vibratory roller and the distance of the chimney to the highway are used to analyze the vibration effect and control countermeasures by geotechnical engineering software. Results show that the vibration main effect is foundation soil not the chimney, and we can take reducing construction vibration, establishing isolation measures or strengthening building to ensure safety of the buildings.
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Bulat, A. F., A. S. Kobets, V. I. Dyrda, V. A. Lapin, S. M. Grebenyuk, M. I. Lysytsia, M. H. Marienkov, H. M. Ahaltsov e Ye V. Kalhankov. "VIBROSEISMIC PROTECTION OF BUILDINGS AND STRUCTURES AGAINST NATURAL AND TECHNOGENEOUS DYNAMIC IMPACTS". Series of Geology and Technical Sciences 445, n. 1 (1 febbraio 2021): 58–65. http://dx.doi.org/10.32014/2021.2518-170x.9.
Testo completoAbstract (sommario):
In this article, the authors analyze results of their long-term researches on protection of buildings and structures against dynamic loads caused by the nature and/or human activities. They also give the grounds for necessity to provide vibration insulation of buildings, and show how to choose and calculate proper parameters for rubber vibroseismic insulators. Specifics of finite element method applied for static calculating the vibroseismic insulators is also described. In order to take into account weak compressibility of rubber, a moment finite element scheme was used, which assumes a triple approximation of the displacement vector components consisting of strain tensor and volume change function. Stress-strain state of the shock absorbers was determined for different standard sizes and diameters. The authors also describe two variants of calculation depending on the method of fixing the insulator’s ends. In the first case, the ends are vulcanized to the metal plates. In the second variant, the ends are free and can move in a horizontal plane. Influence of ratio of the shock absorber height and radius to the strain state of a structure was also analyzed. In order to determine factual levels of the soil and pile vibration (in two horizontal and one vertical directions), vibrodynamic studies were carried out. The obtained vibration signals were registered by the one-component vibration transducers 731A (vibration sensors) produced by the Wilcoxon Research company (the USA). Then, the vibration records were processed by the specialized program “Seismic Monitoring”. Based on the results of these studies, numerical calculations were performed in order to determine whether the predicted levels of the residential building vibrations are in compliance with the existing sanitary standards when exposed to real technogeneous loads. Vibrodynamic tests on vibration acceleration levels of the vibration-insulated reinforced concrete slabs and floors in residential building confirmed high effectiveness of the used vibroseismic insulation system with the rubber elements: the registered vibration acceleration levels in the residential building on all floors did not exceed acceptable levels set by the sanitary standards, and ensured comfortable living conditions under different dynamic impacts. The results of this work make it possible to design buildings with anti-seismic protection by using the designed rubber elements in accordance with the local conditions of the city of Almaty.
38
Yao, Qiang, Xingguo Yang e Hongtao Li. "Development of Absorbed Blasting Vibration Energy Index for the Evaluation of Human Comfort in Multistorey Buildings". Shock and Vibration 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/9567657.
Testo completoAbstract (sommario):
There have been civil disputes and complaints regarding the negative effects of blasting vibration on buildings around the blasting site. By considering the effect of blasting vibration on a human body as a process of energy transfer and conversion, the human body absorbed blasting vibration energy (ABVE) index has been developed for comfort evaluation. Using dynamic monitoring and theoretical analysis, the elevation amplification effect and selective amplification effect on different frequency components of the ABVE have been investigated. The elevation amplification factor and selective amplification coefficients on different frequency components of the ABVE index for a typical 4-storey brick and concrete building have been determined. Based on the results, the magnitude and frequency components of the ABVE index in different parts especially in different storeys for the typical building have been determined. According to the characteristics of human body’s response to vibrations of different frequencies, the frequency-based weighting method of ABVE index has been simplified. By calculating the combined effect of vibrations from all directions, the total human body ABVE and its frequency components at different floors of the building can be determined accurately. This can be used to evaluate the human body comfort against blasting vibration at different floors.
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Khoroshavin, Evgeny A. "Dynamic testing of Krasnoyarskgrazhdanproekt office building in Krasnoyarsk". Vestnik MGSU, n. 2 (febbraio 2021): 128–43. http://dx.doi.org/10.22227/1997-0935.2021.2.128-143.
Testo completoAbstract (sommario):
Introduction. Experimental methods for studying vibrations of buildings and structures (dynamic tests) make it possible to determine an individual set of parameters of dynamic characteristics of natural vibrations inherent in each building and structure. The method of standing waves was chosen to determine dynamic characteristics; it allows to obtain detailed (with the required degree of detail) and, most importantly, reliable data on the technical condition of the building.
Materials and methods. Mobile diagnostic unit “Standing Wave Method” (MSW) recorded the micro-seismic vibrations of building constructions. The layout of sensors with a single reference point was chosen. The standing wave method was applied to develop the software package in order to process the micro-seismic vibrations of the building. Vibration coherence spectra were analyzed to identify the natural frequencies of the building. A GIS model was developed to demonstrate the amplitudes and phases of vibrations in the building.
Results. Eigenfrequencies, peak amplitudes, and phase characteristics of the building’s wave field were determined. Patterns of distribution of amplitudes and maps of vibration phases were constructed. Areas, accommodating destructive processes in the brickwork of the building’s bearing walls, were identified and the reasons for their occurrence were established.
Conclusions. The dynamic characteristics of the building were obtained in reliance upon the results of dynamic tests of the office building. The analysis of the distribution of these parameters allowed to assess the technical condition of the building and to make recommendations towards its strengthening. The author suggests that the mobile diagnostic system, employing the standing wave method, can be used to resolve a wide range of problems.
40
Petřík, Tomáš, Eva Hrubesova, Miroslav Pinka e Alice Hastíková. "Underground Barrier Protection against the Spread of Vibration - A Model Study". Advanced Materials Research 1020 (ottobre 2014): 451–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.451.
Testo completoAbstract (sommario):
The designs of the buildings are in addition to the static load exposed to ground vibrations spreading from the surrounding geological environment. Ground vibrations, which are produced by anthropogenic phenomena, are not usually the crucial load for the stability of the building. But this load have an adversely affect the walls of buildings or sensitive equipment in these buildings. This article will be deal with model study of underground barriers utilized as a protection against the spread of ground vibrations in geological environment. These underground barriers maybe used in the vicinity of roads or railway lines or in urban areas around the halls with heavy industrial activity. Material of underground barriers will be designed from material with different parameters, so that it could be assessed the best variant in terms of absorption of seismic waves. The different variations of the thickness of underground barriers and different distances from the source of vibration will be designed in the analysis. The analysis will be performed in mathematical models that will be created in the software’s based on the finite element method.
41
Hudeček, Leopold, Jiří Svoboda e Jan Kramný. "Reducing the Negative Effects of City Railways on Houses in Ostrava". Advanced Materials Research 1041 (ottobre 2014): 432–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1041.432.
Testo completoAbstract (sommario):
The paper discusses measures to reduce the negative effects of tram traffic on residential house in Ostrava, where the tram line passes through the street area located under the structure of the house see Figure 1.Fig.1HouseNo.1340inOstravaaffectedbyvibrationsfromrailtransportThe lines of urban railways are often kept at densely built-up areas, often in close proximity to the buildings. It is necessary to put a high emphasis on protection against noise and vibration. In case of structures for residential buildings it has a negative effect on residents. An efficient way to reduce the vibration levels of the protected structure and thus the secondary noise is elastic foundation structure as a whole to its support structure. But in practice, we need to solve the problem of the ex post, i.e. when the structure of a residential building already exists.To reduce the transmission of vibrations to the structure was carried out technical measures for vibration attenuation along the route of the spread it is the path from the source to the protected structure. Railway track was imposed on rubber anti-vibration mats under gravel bed of tram line. Furthermore, the test sections were established in order to test the application of different materials used as a grout space between the rails and the surrounding environment and the reference section to compare the resulting data.Subsequently was held the measurement of noise and vibration. Vibrations were measured on the own construction of the house, also on the communication - vertical vibration near the track (30 cm far from the running rail track), these data present the transmission of vibration from the rail and sleepers in the immediate surroundings, measuring the vertical vibrations of the road (150 cm far from the running rail track in place that was not affected by reconstruction), these data present the transmission of vibration to the subsoil neighborhood.
42
Grafkina, M. V., e M. V. Angelova. "Change of Vibration Safety of Industrial Objects in Reconstruction of External Environment". Izvestiya MGTU MAMI 2, n. 2 (20 gennaio 2008): 122–25. http://dx.doi.org/10.17816/2074-0530-69647.
Testo completoAbstract (sommario):
The changes in vibration safety of industrial objects in the conditions of reconstruction of external environment. The authors carried out the experimental research of vibrational speed levels changes in the buildings structures at different shop floors of NPO IT. The paper presents the necessary calculations which allow choosing appropriate shock-absorbers, which compensate vibration transmitting from internal work process at NC machine to control unit, as well as external vibration. The diagram of shock-absorbers installation directly in the concrete bottom is offered. To provide the general safety of new industrial building a special substructure absorbing external vibration is proposed. Some practical recommendations are given.
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Di, Guoqing, Ziyin Xie e Jingyi Guo. "Predict the Influence of Environmental Vibration from High-Speed Railway on Over-Track Buildings". Sustainability 13, n. 6 (15 marzo 2021): 3218. http://dx.doi.org/10.3390/su13063218.
Testo completoAbstract (sommario):
The vibration caused by railways is an environmental constraint in the development of over-track buildings. To study the influence of environmental vibration from the high-speed railway on over-track buildings, a finite element model including track, soil, and buildings was set up. Based on the vertical vibration acceleration sampled on the rail, the equivalent line load acting on rails vertically was obtained by a simplified model. On the basis of verifying the simulation model by measurement results, the vertical vibration induced by high-speed railways in over-track buildings was studied quantitatively. Through introducing correction terms relating to the thickness and height of the over-track platform, the story number, and the structure of the over-track building, an existing model released by the railway industry of China was improved. Compared with the existing model only being suitable for predicting vertical vibration of the first floor, the improved model can predict vertical vibration of different floors.
44
Hafeez, Ghazanfarah, Ghasan Doudak e Ghyslaine McClure. "Establishing the fundamental period of light-frame wood buildings on the basis of ambient vibration tests". Canadian Journal of Civil Engineering 45, n. 9 (settembre 2018): 752–65. http://dx.doi.org/10.1139/cjce-2017-0348.
Testo completoAbstract (sommario):
This research project deals with dynamic field testing of light-frame wood buildings with wood-based shear walls. The primary objective of the investigation is to evaluate the building code formula for estimating light-frame wood building’s fundamental period for seismic analysis, through intensive field testing and numerical modeling. The project also aims to propose an alternative simplified rational approach to seismic analysis of these structures. The paper presents ambient vibration testing results of light-frame wood buildings in Canada. The dynamic characteristics of the measured buildings, such as natural frequency, mode shapes, and equivalent structural damping were obtained from frequency domain analysis of ambient motion records. Using a simplified method of period estimation based on the Rayleigh approximation while using the building mass and replacing the stiffness of shear walls by their length showed reasonable fit when compared with the finite element model results and ambient vibration testing measured periods. A formula was developed based on the regression analysis of the tested buildings. The expression is a function of building height, floor area, and shear wall length and it was shown to provide a reasonably good fit with the measured results.
45
Talbot, J. P., e H. E. M. Hunt. "The effect of side-restraint bearings on the performance of base-isolated buildings". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 217, n. 8 (1 agosto 2003): 849–59. http://dx.doi.org/10.1243/095440603322310404.
Testo completoAbstract (sommario):
Base-isolation of buildings is a common solution to the problem of ground-borne vibration from urban road and rail networks. Conventional designs incorporate vibration isolation bearings between a building and its foundation, aligned in the vertical direction so as to isolate the building from vertical motion of its foundation. In some cases, in order to accommodate horizontal loads, additional side-restraint bearings aligned in the horizontal direction are required. This paper describes a theoretical investigation into the effect of side-restraint bearings on the performance of base-isolated buildings. Three generic models, based on a modern concrete-framed building, are used to demonstrate that a building's flexibility, the nature of the vibration input and the presence of a flexible foundation are all important in determining isolation performance. It is also illustrated how the concept of isolation frequency, commonly used to indirectly specify the stiffness of base bearings, may not be generally extended to side-restraint bearings. The models indicate that, for maximum performance, the stiffness of any side-restraint bearings should be minimized.
46
Cho, Bong-Ho, Eunjong Yu e Hongjin Kim. "Mitigation of wind-induced vibration of a tall residential building using liquid column vibration absorber". Journal of Vibroengineering 18, n. 2 (31 marzo 2016): 1031–40. http://dx.doi.org/10.21595/jve.2015.16755.
Testo completoAbstract (sommario):
The most important thing in applying mass type dampers including Liquid Column Vibration Absorber (LCVA) is tuning its natural frequency to an optimum value which is a function of the natural frequency of the building and the mass ratio of damper to the building. However, exact prediction of the natural frequency of the building at design stage is very difficult especially for concrete buildings. Thus, continuous updating of the target frequency and correction of the design of the damper based on field measurement is necessary. In this paper, application of LCVAs to mitigate the wind-induced vibration of 64-story residential buildings is presented. The LCVA were designed to have adjustable dimension for vertical column to take the advantage of ease tuning and wide frequency range. For updating of initial design, the tuning and performance assessment of LCVA several tests and measurement were carried out. The ambient vibration measurement of a partially completed building and a completed building without water in LCVA was performed and final values of the width of vertical column and the height of water were determined from the system identification results based on the collected acceleration data. In addition, ambient vibration measurement of buildings with LCVA water was performed and the system identification results indicated that the apparent damping ratio due to LCVA was increased about 3.13 to 3.89 times.
47
van der Vecht, J., e R. Dokter. "Noise and Vibration Reducing Measures to the Souterrain Tramtunnel in the Hague Optimally Tuned to the Situation". Journal of Low Frequency Noise, Vibration and Active Control 24, n. 1 (marzo 2005): 49–58. http://dx.doi.org/10.1260/0263092054037685.
Testo completoAbstract (sommario):
Noise and vibration nuisance in residential and office buildings near to traffic tunnels can be prevented by paying attention to vibration isolating and reducing measures at the tunnel and/or the building whilst in the design phase. A vibration prognosis, supported by local measurements, enables optimal tuning of noise and vibration reducing measures to the local situation. This article explains the evaluation criteria and elaborates upon the noise and vibration isolating measures applied to the Souterrain Tramtunnel in The Hague intended to prevent nuisance in the residential and office buildings near to the tunnel.
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Shahsavar, Vahid Lal, e Samira Tofighi. "Uncertainties Concerning the Free Vibration of Inhomogeneous Orthotropic Reinforced Concrete Plates". Slovak Journal of Civil Engineering 22, n. 3 (1 settembre 2014): 21–30. http://dx.doi.org/10.2478/sjce-2014-0014.
Testo completoAbstract (sommario):
Abstract Analyzing nearly collapsed and broken structures gives good insights into possible architectural and engineering design mistakes and faults in the detailing and mismanagement of a construction by building contractors. Harmful vibration effects of construction operations occur frequently. The background reviews have demonstrated that the problem of the vibration serviceability of long-span concrete floors in buildings is complex and interdisciplinary in nature. In public buildings, floor vibration control is required in order to meet Serviceability Limit States that ensure the comfort of the users of a building. In industrial buildings, machines are often placed on floors. Machines generate vibrations of various frequencies, which are transferred to supporting constructions. Precision machines require a stable floor with defined and known dynamic characteristics. In recent years there has been increasing interest in the motion of elastic bodies whose material properties (density, elastic moduli, etc.) are not constant, but vary with their position, perhaps in a random manner. Concrete is a non-homogeneous and anisotropic material. Modeling the mechanical behavior of reinforced concrete (RC) is still one of the most difficult challenges in the field of structural engineering. One of several methods for determining the dynamic modulus of the elasticity of engineering materials is the vibration frequency procedure. In this method, the required variables except for the modulus of elasticity are accurately and certainly determined. In this research, the uncertainly analysis of the free vibration of inhomogeneous orthotropic reinforced concrete plates has been investigated. Due to the numerous outputs obtained, the software package has been written in Matlab, and an analysis of the data and drawing related charts has been done.
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Kowalska-Koczwara, Alicja, Filip Pachla e Veronika Valašková. "Influence of duration of single dynamical events on the result of evaluation of human perception of vibration in buildings". MATEC Web of Conferences 313 (2020): 00017. http://dx.doi.org/10.1051/matecconf/202031300017.
Testo completoAbstract (sommario):
The duration of vibration taken to the analysis influence on the result of evaluation of human perception of vibration. In this paper the relationship between the duration of individual events and the result of RMS and VDV analysis was investigated. The analysis was carried out on two buildings located close to Warsaw Metro line 1. The chosen buildings are typical masonry buildings located in the city center and subjected to three sources of traffic vibrations: subway, tramway and road. Evaluation of human perception of vibration was made using two different methods, the most popular, root mean squared method (RMS) and vibration dose value method (VDV). Methodology of these two methods is also described in the paper. The results from RMS and VDV methods are compared by using HPVR (human perception of vibration ratio) for RMS analysis. It is ratio discovered by prof. Stypula and it is very useful for the diagnosis. The conclusion from analysis are given.
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Scannell, Ken. "Practical Aspects of Investingating Complaints from Vibration in Buildings". Building Acoustics 2, n. 3 (settembre 1995): 505–19. http://dx.doi.org/10.1177/1351010x9500200302.
Testo completoAbstract (sommario):
Increasing environmental awareness has resulted in a large increase in the number of complaints about noise and vibration. Although many guidelines exist for noise and many excellent texts are available for vibration theory, few documents covering the practical aspects of investigating environmental vibration are readily accessible. This paper seeks to redress the balance by discussing the investigation of both the fear of building damage from vibration and the effects of whole body vibration within buildings.