Dissertations / Theses on the topic 'Seismic Isolation System'
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Kelly, John P. (John Peter) 1977. "The installation of a seismic isolation system for building retrofit." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84262.
Full textLUCIA, TROZZO. "Low Frequency Optimization and Performance of Advanced Virgo Seismic Isolation System." Doctoral thesis, Università di Siena, 2018. http://hdl.handle.net/11365/1052744.
Full textKalantari, Afshin. "Artificially generated nonlinear structural system by smart seismic isolation using variable dampers." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144542.
Full text0048
新制・課程博士
博士(工学)
甲第11870号
工博第2563号
新制||工||1358(附属図書館)
23650
UT51-2005-N704
京都大学大学院工学研究科土木システム工学専攻
(主査)教授 家村 浩和, 教授 松久 寛, 助教授 五十嵐 晃
学位規則第4条第1項該当
ZEESHAN, BADAR-UL-ALI. "Constructing an Innovative Base-Isolation System under Masonry Structures." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2540704.
Full textEroz, Murat. "Advanced models for sliding seismic isolation and applications for typical multi-span highway bridges." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19709.
Full textCommittee Chair: DesRoches, Reginald; Committee Member: Goodno, Barry; Committee Member: Jacobs, Laurence; Committee Member: Streator, Jeffrey; Committee Member: White, Donald.
Zhang, Zhi, and Zhi Zhang. "Analytical Investigation of Inertial Force-Limiting Floor Anchorage System for Seismic Resistant Building Structures." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625385.
Full textTROVATO, DANIELE. "Degradation of Dissipative Characteristics of Friction Pendulum Isolators due to Thermal Effect." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2518996.
Full textWenzel, Moritz. "Development of a Metamaterial-Based Foundation System for the Seismic Protection of Fuel Storage Tanks." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/256685.
Full textWenzel, Moritz. "Development of a Metamaterial-Based Foundation System for the Seismic Protection of Fuel Storage Tanks." Doctoral thesis, Università degli studi di Trento, 2020. http://hdl.handle.net/11572/256685.
Full textDehghanpoor, Sichani Ahmad. "Soil-pile-superstructure systems under combined horizontal and vertical strong ground motions." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207885/1/Ahmad_Dehghanpoor%20Sichani_Thesis.pdf.
Full textHill, K. E. "The utility of ring springs in seismic isolation systems." Thesis, University of Canterbury. Mechanical Engineering, 1995. http://hdl.handle.net/10092/7923.
Full textMori, Atsushi. "Investigation of the behaviour of seismic isolation systems for bridges." Thesis, University of Canterbury. Department of Civil Engineering, 1993. http://hdl.handle.net/10092/2455.
Full textSusila, Gede Adi. "Experimental and numerical studies of masonry wall panels and timber frames of low-rise structures under seismic loadings in Indonesia." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-numerical-studies-of-masonry-wall-panels-and-timber-frames-of-lowrise-structures-under-seismic-loadings-in-indonesia(3ceb094b-4e6e-432a-b3de-3d4c306b0551).html.
Full textAcar, Emre. "Comparison Of Design Codes For Seismically Isolated Structures." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607015/index.pdf.
Full textand discussion of various isolator types are involved in this work. Seismic isolation consists essentially of the installation of mechanisms, which decouple the structure, and its contents, from potentially damaging earthquake induced ground motions. This decoupling is achieved by increasing the horizontal flexibility of the system, together with providing appropriate damping. The isolator increases the natural period of the overall structure and hence decreases its acceleration response to earthquake-generated vibrations. This increase in period,together with damping, can reduce the effect of the earthquakes, so that smaller loads and deformations are imposed on the structure and its components. The key references that are used in this study are the related chapters of FEMA and IBC2000 codes for seismic isolated structures. In this work, these codes are used for the design examples of elastomeric bearings. Furthermore, the internal forces develop in the superstructure during a ground motion is determined
and the different approaches defined by the codes towards the &lsquo
scaling factor&rsquo
concept is compared in this perspective.
Han, Mengyu. "Application of Base Isolation Systems to Reinforced Concrete Frame Buildings." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35722.
Full textTaghikhany, Touraj. "Effect of variation of normal force on seismic performance of resilient sliding isolation systems." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145348.
Full text0048
新制・課程博士
博士(工学)
甲第11134号
工博第2413号
新制||工||1321(附属図書館)
22703
UT51-2004-R10
京都大学大学院工学研究科土木システム工学専攻
(主査)教授 家村 浩和, 教授 スコーソン チャールズ, 教授 鈴木 祥之
学位規則第4条第1項該当
Brisebois, Philippe. "Combination of thermal and seismic displacements for the design of base isolation systems of bridges in Canada." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107718.
Full textLes isolateurs sismiques sont utilisés de plus en plus couramment pour la conception des nouveaux ponts ou pour la réfection des ponts existants. Or, ces isolateurs sont relativement nouveaux au Canada. En général, ils protègent la structure du pont en découplant le mouvement du sol du mouvement de la structure et en augmentant la période de vibration afin de réduire les accélérations transmises à la structure. Ces appuis sont conçus pour des déplacements admissibles spécifiés. La norme canadienne des ponts (CSA-S6) adresse les déplacements sismiques et thermiques, mais n'offre aucune directive sur la combinaison de ces déplacements. L'objectif de ma thèse est de présenter les méthodes de calcul pour ces déplacements et de suggérer diverses approches pour faire la combinaison des déplacements. Les ponts de Madrid et de l'autoroute 30 au-dessus du fleuve St-Laurent sont analysés sous les charges sismiques et thermiques de Montréal et Vancouver pour établir une combinaison optimale des déplacements sismiques et thermiques des isolateurs sismiques des ponts au Canada.
Soyoz, Serdar. "Effects Of Soil Structure Interaction And Base Isolated Systems On Seismic Performance Of Foundation Soils." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605119/index.pdf.
Full textIvanoska-Dacikj, Aleksandra, Gordana Bogoeva-Gaceva, René Jurk, Sven Wießner, and Gert Heinrich. "Assessment of the dynamic behavior of a new generation of complex natural rubber-based systems intended for seismic base isolation." Sage, 2017. https://tud.qucosa.de/id/qucosa%3A35604.
Full textFitoz, Hatice Eda. "Response Of Asymmetric Isolated Buildings Under Bi-directionalexcitations Of Near-fault Ground Motions." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614121/index.pdf.
Full textResponse of Isolated Structures Under Bi-directional Excitations of Near-fault ground Motions&rdquo
(Ozdemir, 2010). Each ground motion set (fault normal and fault parallel) are applied simultaneously for different range of effective damping of lead rubber bearing (LRB) and for different isolation periods.
Wang, Jun. "Seismic isolation analysis of a roller isolation system." 2005. http://proquest.umi.com/pqdweb?did=982824301&sid=28&Fmt=2&clientId=39334&RQT=309&VName=PQD.
Full textTitle from PDF title page (viewed on Mar. 15, 2006) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Lee, George C. Includes bibliographical references.
Huang, Shung-Sheng, and 黃清森. "Seismic Analysis on Sliding Isolation System for Bridges." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/50439861486485839346.
Full text國立交通大學
土木工程研究所
83
In this thesis,the seismic behaviors of bridges isolated with sliding systems,including the Teflon bearing and the friction pendulum bearing,are investigated. Since in reality the impact -ing directions of the earthquakes are not necessary along the longitudinal direction of the bridge ,plan motions of the isol -ated are considered in the dynamic analysis.
Kun-AnShiao and 蕭堃安. "An interactive-type dual-isolation system for vertical and horizontal seismic isolation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/68u66q.
Full text國立成功大學
土木工程學系
106
Many studies have confirmed that seismic isolation technology can effectively protect buildings or equipment in strong earthquakes. However, application of seismic isolation systems (SISs) is mostly limited to horizontal isolation, and SISs with both horizontal and vertical isolation capability are rare. Because a vertical SIS must be flexible enough vertically to mitigate vertical ground excitation, this may also reduce the rocking stiffness of the system, simultaneously. As a result, it will easily cause large rocking response and lead to isolation failure in a strong earthquake. On the other hand, an earthquake usually involves both horizontal and vertical ground motions, so the development of horizontal and vertical bi-directional SISs is very important. In this paper, a novel interactive-type dual-isolation system (IDIS) for vertical and horizontal seismic isolation is proposed. The IDIS use the dynamic interaction force between the upper and the bottom substructures exerted by an earthquake to reduce the rocking response (displacement and absolute acceleration) of the isolated structural system. To determine the better parameters for the IDIS, a systematic procedure for parametric study is proposed in this paper. Fourteen sets of earthquake records are considered in the numerical study to verify the capacity of the IDIS. The simulation results show that the IDIS has good anti-rocking capability. As compared with its single-layer isolation counterpart system, the average rocking displacement of the bottom and the upper structure of IDIS can be reduced by 29% and 57%, respectively. The average acceleration of the bottom and the upper substructures of the IDIS can be reduced by 57% and 21%, respectively. Moreover, the corner rocking amplification effect of the IDIS system is less than that of the single-layer system.
Kuo, Tzu-Ching, and 郭子敬. "Seismic protection of structures using stiffness controllable isolation system." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/84084875966927683956.
Full text國立高雄第一科技大學
營建工程所
92
Although conventional sliding isolators are very effective for vibration mitigation of structures subjected to regular far-field earthquakes, recent research has shown that they may not be effective for near-field earthquakes, which usually possess a long-period pulse-like waveform. Adding active device in the isolation systems may improve the near-fault responses of conventional sliding isolation, but the required control force is usually very large. In order to overcome this problem, a semi-active sliding isolation system, called Stiffness Controllable Isolation System (SCIS), was proposed in this study. This isolation system produces a semi-active control force by adjusting the isolator’s stiffness. The semi-active force is determined based on a target control force, which is computed according to an active control law. In this study, two types of active control laws were employed to determine the target force, namely, optimal feedback control and modal control. The numerical results showed that for far-field and near-fault earthquakes, the proposed SCIS system is more effective on mitigating both the base displacement and the super-structural acceleration than the pass isolation (conventional sliding isolator), while it requires less control force than its active control counterparts. Finally, a lever mechanism to realize the SCIS system was also proposed in this study. This mechanism alters the restoring stiffness of the isolator by controlling the lever arm. The numerical results demonstrated that the mechanism can achieve the goal of SCIS.
Yeh, Chun-Chih, and 葉俊志. "System Identification of Building with Mid.-Floor Seismic Isolation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/56048880479693707653.
Full textKuo, Tai-Chuan, and 郭泰銓. "System Identification of a Building With Mid-story Seismic Isolation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/95918937497899053939.
Full text國立臺灣大學
土木工程學研究所
101
The objective of the research is to establish a system identification procedure of building with mid-story isolation, expecting to identify meaningful and physical parameters of building with a simplified model. We use lump mass method, simplifying a building with mid-story isolation into a four lump mass system. Respectively, these are superstructure, floor above isolation system, substructure and equivalent foundation. And we consider there are three degrees of freedom (longitudinal, transverse and torsional) in every lump mass, total of twelve degrees of freedom. For the superstructure, we use effective modal mass method to simplify multiple degrees of freedom system, and consider torsional coupling effect with it. Bilinear mechanical behavior assumed in isolation story with LRB, following the Skeleton curve in Masing Rule. Besides, in equivalent foundation, we describe the soil-structure interaction system with the Soil Spring Method. Soil and structure are simplified impedance between the effective spring and damping, and assume that the reaction is a non-linear response, following the Bouc-Wen Modal. We use the concept of least square method in the identification. This is a non-linear least square problem because there two eccentricities in superstructure. Therefore, we used Levenberg-Marquardt algorithm to solve non-linear least square problem. In numerical example, we estimated the structure parameter with twelve degrees of freedom of mid-story isolation building modal. Next, we input El Centro earthquake and calculated dynamics response of all degrees of freedom by Newmarkβ linear acceleration method. Subsequently, regarding the behavior of each degree of freedom as measurement data, the identification procedure is executed to verify the suitability of identification theory and modified identification model. The data gathered by strong motion instrumentation program in the New Research Building of Civil Engineering department of National Taiwan University is adopted as measurement data to implement practical analysis, both the single and multi-section identification are accomplished and discussed in the research. Finally, the reliability of the identification procedure is verified by calculating the error index between the result of identification procedure and measurement data.
Fenz, Daniel Mark. "Further development, testing and modeling of the Axon seismic isolation system." 2005. http://wwwlib.umi.com/dissertations/fullcit/1426749.
Full textTitle from PDF title page (viewed on Feb. 2, 2006) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Michael C. Constantinou.
Chang, Cheng-Lin, and 張正霖. "Effects of Near-Fault Ground Motions on Hysteretic Seismic Isolation System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/73428312149375981512.
Full text國立臺灣科技大學
營建工程系
104
The concept of seismic isolation design method has been accepted as an effective method for the seismic mitigation. However, to design a seismic isolation system against near-fault ground motions has been an important and challenging issue in seismic isolation design. In this study, it is an attempt to identify the effect of various characteristics of near-fault ground motion in affecting the seismic response of isolation system. These important characteristics may include but not limited to the velocity pulse, incremental velocity, peak ground velocity, pulse period, input energy, and momentary input energy. For so doing, 10 far-field ground motions and 30 near-fault ground motions provided by Jack. W. Baker identified based on the wavelet analysis are used for this analytical study. A simple bi-linear base isolation system is assumed and nonlinear response history analysis is conducted to identify the importance of the aforementioned characteristics of near-fault ground motions. The results indicate that peak ground velocity (PGV), incremental velocity, and momentary input energy may be the significant characteristics of near-fault ground motions in affecting the seismic response of isolation system. In addition, the duration of velocity pulse extracted from the original ground motion may also play an important role. However, further study is required to ascertain the importance of the residual ground velocity history after the velocity pulse extraction.
SEBASTIANI, PAOLO EMIDIO. "Performance-based seismic assessment for life-cycle cost analysis of existing bridges retrofitted with seismic isolation." Doctoral thesis, 2016. http://hdl.handle.net/11573/874444.
Full textHuang, Cheng-Kang, and 黃承康. "System Identification of Building with Mid.-Floor Seismic Isolation by Using Output-error method." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/29268377010880830894.
Full text國立臺灣大學
土木工程學研究所
98
Abstract The objective of the research is to establish a system identification procedure of mid-story isolation building to identify the meaningful parameters of building with simplified building model. The research simplifies the mid-story isolation building as four degree of freedom system by using lump mass method. The four degree of freedom systems are superstructure, floor above isolation system, substructure and equivalent foundation, respectively. By using effective modal mass and effective modal height method, the multiple degrees of freedom system for superstructure are divided into single degree of freedom system. Assuming the mechanical behaviors of superstructure and substructure are linear, and the behavior of isolation story is non-linear; further, the behavior of isolation story is simplified from non-linear to bilinear behavior by using massing criteria. The damping of isolation story is assumed as non-linear damping in the research, the other freedoms are linear damping. As for the equivalent foundation, a set of equivalent damping and spring is adopted to simulate the soil-structure interaction of the mid-story isolation building, and the mechanic behavior of foundation is assumed as linear; finally, the Output-error method is applied to each degree of freedom to identify the linear parameter of superstructure, substructure and equivalent foundation, and the non-linear parameter of LRB. In numerical examples section, according to the 「Structural computation statement in the New Research Building of Civil Engineering department of Nation Taiwan University」, mass, stiffness, damping parameter of each degree of freedom can be estimated voluntarily. Following the research regards the ground acceleration of TAP089EW921 earthquake as input data, and then the Newmark’s linear acceleration method is used to obtain the behavior of each degree of freedom. Subsequently, regarding the behavior of each degree of freedom as measurement data, the identification procedure is executed to verify the suitability of identification theory and modified identification model. The data gathered by Strong Motion Instrumentation Program in the New Research Building of Civil Engineering department of Nation Taiwan University is adopted as measurement data to implement practical analysis, both the single and multi-section identification are accomplished and discussed in the research. Finally, the reliability of the identification procedure is verified by calculating the error indicators between the result of identification procedure and measurement data.
Shih, Chi-Yang, and 施啟揚. "System Identification of a Building with Mid-story Seismic Isolation using Artificial Neural Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/54560133221255595438.
Full text國立臺灣大學
土木工程學研究所
102
In the recent years, the techniques against the earthquake are used to mitigate the effects of nature hazards on civil infrastructure, especially in isolation technology, which widely used in a lot of administrative, commercial and residential buildings. It will help a lot if we can clearly get the characteristics by simplifying isolation technology. So an identification model of isolation building can be established. The objective of the research is to establish a system identification model of building with mid-story isolation, expecting to identify meaningful and physical parameters of building with a simplified model. We use lump mass method, simplifying a building with mid-story isolation into a three lump mass system. Respectively, these are superstructure, isolated-structure and substructure. And we consider there are three degrees of freedom (longitudinal, transverse and torsional) in every lump mass, total of nine degrees of freedom. For the superstructure, we use effective modal mass method to simplify multiple degrees of freedom system, and consider torsional coupling effect with it. Bilinear mechanical behavior assumed in isolation story with LRB, following the Skeleton curve in Masing Rule. In the research, integrating following theory and Artificial Neural Network (ANN), we analyze the relationship between the structure vibration and ground-motion and use Back Propagation Network (BPN) to build the model. We can divide it into two stages, linear and nonlinear model, in the process of development. Linear model is major to build the framework with ANN. By the framework, we can set up bilinear mechanical behavior into nonlinear model. After developing, the model will be verified by numerical analysis after developing at each stage of model development. We design the structure parameter with nine degrees of freedom of mid-story isolation building model. Next, we input El Centro earthquake and calculated dynamics response of all degrees of freedom by Newmark β linear acceleration method. Subsequently, regarding the behavior of each degree of freedom as measurement data, the identification model is executed to verify the suitability of identification theory and modified network framework. In identification of real case, the data gathered by strong motion instrumentation program in the New Research Building of Civil Engineering department of National Taiwan University is adopted as measurement data to implement practical analysis, both the single and multi-section identification are accomplished and discussed in the research. At final, the reliability of the frame of network is verified by calculating the error index between the result of identification model and measurement data.
Wu, Bo-Tsang, and 吳柏蒼. "System Identification of a Building with Mid-Floor Seismic Isolation Using Bouc-Wen Model." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/07614116902163865629.
Full text國立臺灣大學
土木工程學研究所
99
This thesis constructs a system identification procedure of building with mid-story isolation , expecting to identify physical parameters of a building with a simplified modal. We used lump mass method, simplifying a building with mid-story isolation into a four degree of freedom system. These degrees of freedom are superstructure, floor above isolation system, substructure and equivalent foundation. For the superstructure, concepts of effective modal mass and effective modal height are adopted to simplify multiple degree of freedom to single degree of freedom. Linear mechanical behavior is assumed in superstructure and substructure; nonlinear mechanical behavior is assumed in isolation story, following the Bouc-Wen modal. Besides, in equivalent foundation part, to describe the soil structure interaction system with the Soil Spring Method. Soil and structure is a simplified impedance between the spring and damping, and assume that the reaction is a non-linear response. We used Output-error method to identify superstructure’ s, substructure’s , Bouc-Wen modal in floor above isolation’s and equivalent foundation’s parameters. In numerical example, we considered structural calculation to evaluate four degree of freedoms’ stiffness and damping, and we input TAP089EW921 to state spacement to calculate the response of all degree of freedom. We used the response to identify the parameters. By numerical example, we hope to improve the accurate of the modal and the reasonable of the procedure. Finally, the reliability of present procedure was verified by calculating the error index between the measured data and identified results from new Civil Engineering Building at NTU
Faiella, Diana. "The Intermediate Isolation System for new and existing buildings: seismic behavior and design criteria." Tesi di dottorato, 2017. http://www.fedoa.unina.it/12202/1/Faiella_Diana_30.pdf.
Full textHuang, Chung-Shing, and 黃中興. "A study on strengthening the seismic capacity of mobile equipments by a magnetic isolation system." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/49957191317790751121.
Full text國立成功大學
建築學系碩博士班
91
Many building equipment were damaged in past earthquakes due to lack of easy-to-use seismic resistant measures to prevent from overturning or sliding . This study suggests a new seismic resistant measure on mobile equipment : 「 To strengthen the seismic capacity of mobile equipment by magnetic force」. The first step is to install an energy saving electromagnetic chuck beneath or beside the equipment and to place a steel plate to the floor or to the dry wall with 3M’s double-face stickers. When charged by current, the electromagnetic chucks produce sufficient magnetic force which helps to attach the equipment to the steel plate, thus the equipment is anchored. This study has investigated the performance of this new measure by shaking table tests in two kinds of equipments : 1.Show cases in museum, vertically fixed to steel plate on floor by magnetic force. 2.Hospital beds, horizontally fixed to steel plate on dry wall by magnetic force. After the tests, several properties of mobile equipment fixed by magnetic force were founded: 1.The advantage is easy to operate, easy to move, no damage on the floor , and much cheaper than isolators . 2.Magnetic force won’t produce inertia force to the equipment nor extra bearing weight on the floor. 3.To prevent equipment from overturning or sliding, the stronger the magnetic force is used, the more seismic capacity the equipment has. 4.Strengthened by magnetic force, the show case on one hand was prevented from rocking, and on the other hand was allowed to slide moderately on the surface of the steel plate. This behavior provides the energy dissipation and reduces the acceleration of exhibition items inside the show case. 5.Analysis revealed that the vibration patterns of equipment and energy dissipation under seismic excitation are controlled by two factors: 1). The magnetic force 2). The friction between electromagnets and steel plate In conclusion, strengthening the seismic capacity of mobile equipment by magnetic force, which is named “Sliding Magnet Isolators(SMI)”, is easy to operate and can provide sufficient seismic capacity to the mobile equipment.
羅榮宗. "The Application of Seismic Isolation System-A Case Study of Mid-Story Isolated Building in Taipei." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/21222805432179942327.
Full text明新科技大學
土木工程與環境資源管理研究所
100
Abstract The typical seismic-resisting technics used for building structures can not reduce the large amount of lateral displacement and acceleration at the same time. However, seismic-isolated type building can reduce both displacement and acceleration. It is obvious that the latter provides more comfortable and safer structure and, meanwhile, allows the building to maintain its function. In addition, the new appearance of the building may be designed through the innovative development because of the use of above-mentioned building isolation system. In this study, a newly constructed 15-story building in Taipei which is applied by using the isolation system was investigated through detailed literature review, analysis and result comparison. The final conclusions are summarized as follows : 1. Due to the lack of technical experience on the seismic isolation system used in the local building industry, the study has made from literature review of related applications. Detailed discussions are given for different stages when using the isolation system, ie., planning, design, construction, and maintaining management. 2. By using the case study, it is expected that the building utilized by the isolation system can reach its design functions and reduce the structural damages caused by the earthquakes. The isolated system used in the building design may be one of the best selection for structural design. 3. In order to compare the difference between the seismic-resisting and seismic-isolation building, this study presents the design and construction details for the seismic-isolation building. The design specification, construction method, cost, facilities, fire-resistance and maintenance management are also discussed for their differences. Keywords : isolation buildings, seismic-resisting buildings, isolation components
Peng, Kuan-Wen, and 彭冠文. "Experimental and theoretical study on a vertical and horizontal bi-directional seismic isolation system for equipment in buildings." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87649575647925369534.
Full text國立高雄第一科技大學
營建工程研究所
103
Recent studies have revealed that both horizontal and vertical seismic forces can cause damage to vibration-sensitive equipment within a building. Seismic isolation technology may be used for the protection of the equipment. However, most isolation systems are only applicable to horizontal isolation. Vertical seismic isolation systems are rare, because there is a conflict in the demands of isolation stiffness. In the other words, a seismic isolation system usually calls for a lower stiffness to mitigate the transmitted seismic force, while it also requires a higher vertical stiffness to carry its weight statically. In order to deal with this difficulty, an inertia-type bi-directional isolation system (IBIS) is proposed in this study. The IBIS uses a leverage mechanism and a counterweight to generate a lifting force in its static state and an inertial force in dynamic state. As a result, in the vertical direction, the IBIS has a higher equivalent static stiffness, while a lower equivalent dynamic stiffness. In order to investigate the IBIS behavior thoroughly, this thesis is divided into three topics: (1) Firstly, the equation of motion of the IBIS subjected to both horizontal and vertical ground motions is derived. After verified by a shaking table test, the analysis method was then employed to evaluate the isolation effectiveness of the IBIS. It is shown that because IBIS possesses an anti-resonance property, it performs well in both near-fault and far-field earthquakes. (2) For the second topic, an analysis method for an IBIS mounted on a building floor by considering three-directional floor excitations (namely, horizontal, vertical and rocking) was derived. After verified experimentally, the analysis method was used to assess the isolation effectiveness of an IBIS placed on a building floor. The results demonstrate that the isolation performance of the IBIS subjected to floor excitations is superior to that of IBIS subjected to ground excitations. (3) In the third topics, whether a vertical-horizontal bi-directional isolation system can provide better seismic protection for block-type equipment was investigated. Several possible failure patterns for block-type equipment were defined, first. Then, the performance of various isolation systems was evaluated based on the failure percentages of equipment. The studied parameters include: aspect ratio of equipment, friction coefficient of equipment base, horizontal-to-vertical excitation ratio and earthquake types, etc. The study shows that in a ground excitation, the difference of failure percentages between the bi-directional and the horizontal isolation systems is insignificant. However, in a floor excitation, the bi-directional isolation system is able to greatly improve the safety of equipment, as compared with the horizontal isolation along.
Pasala, Dharma Theja. "Seismic response control of structures using novel adaptive passive and semi-active variable stiffness and negative stiffness devices." Thesis, 2013. http://hdl.handle.net/1911/72017.
Full textCILLA, ROSARIO EMANUELE. "New frontiers for seismic isolation systems." Doctoral thesis, 2019. http://hdl.handle.net/11570/3146800.
Full textLin, Ging-Long, and 林錦隆. "Semi-active isolation systems for seismic structures." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/91622685759917301180.
Full text國立高雄第一科技大學
工程科技研究所
96
Base isolation technology may be used for seismic protection of critical structures or equipments. However, recent studies have revealed that a conventional passive isolation system may induce an excessive base displacement when subjected to a near-fault earthquake with strong long-period components. In order to enhance the efficiency and safety of seismic isolation for structures in near-fault areas, a semi-active isolation system (SAIS) that consists of isolators and a variable damper is proposed in this study. Three kinds of variable dampers are discussed in this study. The first is the variable stiffness damper, the second is the variable friction damper, and the third is the variable viscous damper. The resistant force of a variable damper can be adjusted by its controllable parameter according to an on-line control law and the measured system response. The seismic response of the SAIS system equipped with each of the three types of variable dampers mentioned previously and subjected to near-fault earthquakes was simulated numerically in this study. In addition, its isolation performance was also evaluated and compared with the performance of a passive and an active isolation system. The results of these comparisons are discussed in this study. The simulation result demonstrates that the SAIS system is able to prevent the excessive displacement and acceleration response of structure induced by long-period pulse components of near-fault earthquakes.
Liao, Wei-Hsin, and 廖偉信. "Seismic Isolation Systems for Earthquake Protection of Structures." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/51482751342403192725.
Full text國立交通大學
土木工程系
91
In this thesis, the feasibility and potential of using friction pendulum bearings as well as rocking mechanism for earthquake protection of structures have been explored. Both the friction pendulum bearings and rocking mechanism are considered seismic isolation systems that protect the structures by cutting off the path of earthquake transmission. The friction and rocking mechanisms are similar in that they are both highly nonlinear in nature due to discontinuity at the phase or direction changes of motion. A novel numerical algorithm has been developed for the nonlinear dynamic analysis of structures with sliding isolation. According to the proposed method, a unified motion equation is adopted for both the stick and slip modes of the system. Derived under the framework of state-space representations, the proposed algorithm proves to be more efficient and accurate than existing methods. Moreover, it is general enough for analysis of structures with multiple sliding isolators undergoing unsynchronized support motions. Feasibility of using friction pendulum bearings for seismic isolation of bridges has been investigated under real earthquakes. Under the revised configuration by replacing one of the roller supports on the abutments with hinge support, the isolated bridge performs consistently well during various earthquakes, regardless of the site conditions. The usefulness of seismic isolation of bridges is confirmed. Moreover, effectiveness of friction pendulum bearings on earthquake protection of stepped structures as well as continuous bridges under unsynchronized support motion has been verified. In the second part of this thesis, the feasibility of utilizing rocking mechanism for earthquake protection of viaduct-type structures has been explored both experimentally and analytically. The slender high-pier structure is represented by an A-shaped frame, which exhibits the basic features of RPS. Analytical modeling of this nonlinear dynamic system is derived and a numerical procedure developed based on the fourth-order Runge-Kutta-Nyström method. The amplitude-dependent cycling time and energy-dissipative nature of rocking mechanism has been derived analytically and observed experimentally in the free rocking tests. The coefficient of restitution derived theoretically matches closely with the test results. Good correlation between the experimental and analytical results has been achieved. The proposed analytical modeling and solution algorithm for dynamic analysis of rocking systems has been sufficient. Moreover, stability and effectiveness of the rocking pier system under severe earthquakes have been confirmed via shaking table tests. It has been observed from this series of tests that, the stronger the earthquake intensity the better the control efficiency.
Peternell, Altamira Luis E. 1981. "Stability-dependent Mass Isolation for Steel Buildings." Thesis, 2012. http://hdl.handle.net/1969.1/148042.
Full textChiung-LinLiu and 劉瓊琳. "Application of Air Springs for Inertial-type Seismic Isolation Systems." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/m27mcq.
Full textAliaari, Mohammad. "Development of seismic infill wall isolator subframe (SIWIS) system." 2005. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-748/index.html.
Full textHarvey, Jr Philip Scott. "Rolling Isolation Systems: Modeling, Analysis, and Assessment." Diss., 2013. http://hdl.handle.net/10161/8012.
Full textThe rolling isolation system (RIS) studied in this dissertation functions on the principle of a rolling pendulum; an isolated object rests on a steel frame that is supported at its corners by ball-bearings that roll between shallow steel bowls, dynamically decoupling the floor motion from the response of the object. The primary focus of this dissertation is to develop predictive models that can capture experimentally-observed phenomena and to advance the state-of-the-art by proposing new isolation technologies to surmount current performance limitations. To wit, a double RIS increases the system's displacement capacity, and semi-active and passive damped RISs suppress the system's displacement response.
This dissertation illustrates the performance of various high-performance isolation strategies using experimentally-validated predictive models. Effective modeling of RISs is complicated by the nonholonomic and chaotic nature of these systems which to date has not received much attention. Motivated by this observation, the first part of this dissertation addresses the high-fidelity modeling of a single, undamped RIS, and later this theory is augmented to account for the double (or stacked) configuration and the supplemental damping via rubber-coated bowl surfaces. The system's potential energy function (i.e. conical bowl shape) and energy dissipation model are calibrated to free-response experiments. Forced-response experiments successfully validate the models by comparing measured and predicted peak displacement and acceleration responses over a range of operating conditions.
Following the experimental analyses, numerical simulations demonstrate the potential benefits of the proposed technologies. This dissertation presents a method to optimize damping force trajectories subject to constraints imposed by the physical implementation of a particular controllable damper. Potential improvements in terms of acceleration response are shown to be achievable with the semi-active RIS. Finally, extensive time-history analyses establish how the undamped and damped RISs perform when located inside biaxial, hysteretic, multi-story structures under recorded earthquake ground motions. General design recommendations, supported by critical-disturbance spectra and peak-response distributions, are prescribed so as to ensure the uninterrupted operation of vital equipment.
Dissertation
王彥茗. "Analytical Solutions of Interactive Behavior between Seismic Isolation and Soil Systems." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/n26mw4.
Full text逢甲大學
土木水利工程與建設規劃博士學位學程
107
This paper focuses on investigating the effects of soil-structure interaction (SSI), higher modes, and damping on the response of a mid-story-isolated structure founded on multiple soil layers overlying bedrock. Closed-form solutions were ob-tained for the entire system, which consists of a shear beam type superstructure, seismic isolator, and multiple soil layers overlying bedrock, while subjected to ground motion. The proposed formulations simplify the problem in terms of well-known frequency and mechanical impedance ratios that can take into account the effects of SSI, higher modes, and damping in the entire system, and be capable of explicitly interpreting the major dynamic behavior of a mid-story-isolated structure interacting with the multiple soil layers overlying bed rock. The SSI effects on the dynamic response of a mid-story-isolated structure as a result of multiple soil layers overlying bedrock were extensively investigated through a series of parametric studies and physically explained by virtue of derived formulations. In addition, the results of numerical exercises show that higher damping provided by the isolator may provoke higher mode response of the superstructure; that the lower structure below the isolator may have significantly larger deformations compared to those of the up-per structure above the isolator; and that isolator displacements may be amplified by the SSI effects while compared to those of mid-story-isolated structures with fixed-base.
Tseng, Yi-Hao, and 曾繹豪. "Effects of Near-Fault Ground Motion Characteristics on Seismic Isolation Systems." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zke9sz.
Full text國立臺灣科技大學
營建工程系
107
The damage potential of near-fault ground motions to structures, in particular the flexible structures such as seismically isolated structures and high-rise buildings, may be much more than that of far-field ground motions. In 1971, Mahin and Bertero discovered that the “maximum incremental velocity” could be one of the indices to well represent the damage potential of near-fault ground motions. In 1995, John Hall et al. showed that the displacement pulse contained in the near fault ground motions could also be another index demonstrating damage potential of near fault ground motions. Considering the two important findings, this study is conducted with an intension to investigate the significance of a parameter which is composed of the maximum incremental velocity (MIV) and the duration of maximum incremental velocity (TIV). The MIV is multiplied by TIV as an index for the seismic response demand on isolation systems by near fault ground motions. For design purpose of isolation system against near-fault ground motions, the current isolation design specifications generated from equivalent linear analysis are examined for their accuracy and appropriateness in predicting the seismic responses of isolation system subject to near fault ground motions. Maximum seismic responses obtained from various equivalent linear models using linear dynamic analysis are compared with those determined by nonlinear dynamic analysis. In addition, maximum responses predicted using iterative static analysis as employed by current seismic isolation design codes are used to compare with the results from nonlinear dynamic analysis so that the damping reduction factor can then be examined for its appropriateness.
Kuo, Shin-Ming, and 郭世明. "Analytical Study on the Role of Viscous Dampers in Seismic Isolation Systems." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/z53u74.
Full text國立臺灣科技大學
營建工程系
94
Abstract The excessive displacement demand on the isolation system by long period and/or near field earthquake ground motions is always a concern when designing a seismically isolated structure. If the isolated structure is designed with respective to the demand of maximum considered earthquakes and/or near field earthquakes, the isolation system may not perform effectively well when the isolated structure is subjected to small and moderate earthquakes. Therefore, it is very difficult to design an isolation system that will perform effectively across small, moderate and major earthquakes (or call it all purpose isolation system, APIS). It has been recognized that to include viscous dampers in an isolation system is an effective method to control the displacement response without dramatically increasing the transmitted force of the isolation system. This is due to the existence of a phase lag between the damper force and damper displacement while most of isolation bearings such as lead-rubber bearings has an in-phase behavior between their force and displacement. In this study, analytical study is conducted to study the significance of damping exponent and in an isolation system composed of viscous dampers and lead-rubber bearings. Conceptually, the purpose for adopting the so far never-used (in civil engineering structures) viscous dampers with is to fulfill the requirement of an APIS. This is because the viscous damper is an redundant when the isolated structure is subjected to small and moderate earthquakes, and is efficiently effective while major earthquakes strike.
鄭育婷. "Application of Seismic Isolation Systems to High-raised Houses in Lowland Regions." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85975114074144452783.
Full textOzbulut, Osman Eser. "Seismic Protection of Bridge Structures Using Shape Memory Alloy-Based Isolation Systems against Near-Field Earthquakes." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8687.
Full textChen, Ting-Hui, and 陳廷暉. "Effects of Near-Fault Ground Motions on Seismic Isolation Systems and Corresponding Design Strategies." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8htk62.
Full text國立臺灣科技大學
營建工程系
107
The concept of seismic isolation design has been accepted as an effective method for the seismic mitigation of structures. However, in Taiwan, an earthquake prone island, many sites are located in near-fault zones. The recorded seismic waves have near-fault characteristics such as velocity pulses and displacement pulses. These seismic waves may cause excessive displacement demand on the isolation system and transmit significant acceleration to the superstructure. Consequently, the isolation design to the structures located at near fault area is challenging. The objective of the study is to develop a suitable design strategy of an isolation system to resist the near-field ground motions. The code-specified procedure and an existing procedure are examined for their appropriateness in designing the seismic isolation system against near-fault ground motions. A design procedure is proposed for the isolation system composed of lead-rubber bearings and viscous dampers. The results show that the proposed procedure can lead to a controllable maximum displacement of the isolation system and an acceptable transmitted acceleration transmitted to the superstructure.