Zeitschriftenartikel: „KHM cable model“

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He, Guo Jing, Zhong Quan Zou, Yi Qing Ni und Jin Ming Ko. „Seismic Response Analysis of Multi-Span Cable-Stayed Bridge“. Key Engineering Materials 400-402 (Oktober 2008): 737–42. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.737.

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Based on the dynamic characteristics analysis results of a precise three-dimensional finite element model, the earthquake responses of the bridge are analyzed in this paper. The influences of cable local modes and stabilizing cables on the seismic response are investigated by using different mode combinations and different models. It is found that the influence of cable local modes is negligible on the side towers while significant and not negligible on the main tower; the influence of the stabilizing cables is significant and not negligible on side towers, while minor and negligible on the main tower. As for the deck displacements, the influence of cable local modes is minor and negligible, while that of longitudinal stabilizing cables is significant and not negligible.

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Pérez-Aracil, J., A. M. Hernandez-Díaz, J. F. Jiménez-Alonso und F. J. Puerta-Lopez. „Fatigue Assessment of a Slender Footbridge Based on an Updated Finite Element Model“. Key Engineering Materials 774 (August 2018): 589–94. http://dx.doi.org/10.4028/www.scientific.net/kem.774.589.

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Finite element model updating is a well-known technique to better characterize the real behaviour of civil engineering structures. The updated numerical model can be used to perform a more accurate structural assessment. Herein, its effectiveness is validated through the fatigue assessment of a lively footbridge considering two different numerical models: (i) a preliminary finite element (FE) model and (ii) an updated version of the preliminary model based on the modal parameters of the footbridge identified experimentally. For this purpose, the Malecon footbridge (Murcia, Spain) has been considered. This footbridge, a cable-stayed structure, is prone to vibrate in vertical direction under continuous walking pedestrian flows so fatigue damage might be expected on its supporting cables. A detailed FE model of the footbridge has been performed and subsequently updated based on the experimental modal parameters of the structure. The behaviour of the pedestrian flows was characterized by field observations. Finally, a comparison is performed between the fatigue damage of some cables of the footbridge considering the two mentioned FE models. The safe life method was used to assess such damage. As result, a maximum relative difference around 52 % was obtained between the two numerical models.

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Li, Yan, Da Gang Lv und Hong Fei Sheng. „Fatigue Reliability Analysis of the Stay Cables of Cable-Stayed Bridge under Combined Loads of Stochastic Traffic and Wind“. Key Engineering Materials 456 (Dezember 2010): 23–35. http://dx.doi.org/10.4028/www.scientific.net/kem.456.23.

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The existent studies on cable stays fatigue for the serviced cable-stayed bridge generally only considered traffic or wind load action respectively. The long span cable-stayed bridges are very sensitive to wind load, so the fatigue estimation of cable stays considering traffic and wind load simultaneously is very important for the bridge safety. In the present research, taking an actual bridge as an example, based on linear cumulative damage theory, fatigue reliability of cable stays is analyzed under combined load of vehicles and wind. Firstly, based on the long-term traffic survey and wind speed data, traffic and wind load probability distribution models for the bridge are built respectively. Secondly, an intensive computational work is performed to obtain stress time history of the stay cables in the typical time block by running self-compiled Bridge-Vehicle-Wind interaction dynamic response analysis program. Thirdly, the stress result is updated in accordance with traffic growth and extreme wind speed changing in service period. The stress amplitude and frequency are attained by rain-flow cycle counting method. Finally, the fatigue damage limit state function of cable stays is proposed based on linear cumulative damage theory, and solved by Monte-Carlo method. The analysis result shows that the effect of buffeting wind load on the fatigue reliability of cable stays is significant, the influence degree increases generally in accordance with the order from short cable to long cable. The fatigue life of cable under designed safety probability reduces by the range from 2% to 63%, average 50% compared to only considering traffic load. So fatigue assessment of stay cables should take traffic and wind loads together into account. The proposed analysis framework offers a referenced fatigue assessment approach for conventional long span bridges.

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Votsis, R. A., M. M. Abdel Wahab und M. K. Chryssanthopoulos. „Simulation of Damage Scenarios in an FRP Composite Suspension Footbridge“. Key Engineering Materials 293-294 (September 2005): 599–606. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.599.

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Simulations of damage scenarios were carried out using a finite element model of a newly constructed FRP composite footbridge, the Wilcott footbridge. This footbridge represents a new generation of suspension footbridges that have lightweight decks made of pultruded glass fibre reinforced polymer (GFRP) composite elements. It offers several advantages over conventional steel or concrete footbridges, e.g. speed of installation, high resistance to corrosion and saving in weight and foundations. On the other hand, its lightness and slenderness make it more sensitive to dynamic effects, both at serviceability and ultimate limit states. A finite element model using 3-D beam elements was constructed and damage scenarios were simulated and introduced in the model. The natural frequencies, mode shapes as well as time responses due to pedestrian loading were predicted. Different size of delamination in the composite deck was simulated at various locations along the bridge. The sensitivity of natural frequencies and mode shapes due to delamination were assessed by comparing the results of the damaged deck to those of the reference intact deck. The effect of changes in the cables’ initial strains on the modal parameters was also examined, and the sensitivity of modal parameters to cable degradation was assessed.

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Bi, Hong Tao, und Yan Li. „The Length Optimization of Non-Stayed Cable Segment to Low-Pylon Cable-Stayed Bridge“. Key Engineering Materials 540 (Januar 2013): 131–39. http://dx.doi.org/10.4028/www.scientific.net/kem.540.131.

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An optimization model was proposed in order to investigate the effect of the non-stayed cable segment length on the performance of a low-pylon cable-stayed bridge. Based on the structural analysis of the cable-stayed bridges, the proposed model aims to adjust the structural internal force by changing the non-stayed cable segment length. The most reasonable length of non-stayed cable segment was obtained by the optimization analysis.

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Sun, Yong Ming, und Hang Sun. „Impact Analysis of the Flexural Rigidity on the Frequency and Tension of the Stay Cable“. Key Engineering Materials 540 (Januar 2013): 153–63. http://dx.doi.org/10.4028/www.scientific.net/kem.540.153.

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Research and practice show that frequency method is still the most practical and accurate method among all kinds of cable force measurements. Based on the classical string vibration theory, the finite element model of stay cable was created, and a method of iteratively computing stay cable balance curve considering with flexural rigidity was proposed. How dose the flexural rigidity affects the balance curve of stay cable was discussed, and the changing curves of the distance-to-sagging ratio following the pull-to-bend ratio were plotted, which indicated the bigger flexural rigidity, the smaller sagging. 25 pairs cable modality of Xichang cable stayed bridge were accurately analyzed, mode crossover was testified by finite element method, changing curves of frequency and mode shape following the cable force were separately plotted, and changing rule was induced, practical cable force computing method was given. Frequency difference is suitable to judge the rank of actual measurement frequency, and the second frequency is recommended to compute cable force. Engineering instance analysis testified, the method of practical cable force measurement could rule out errors by mode crossover, and be applied to cable with any lengths and any force.

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Zhou, Jia Fu, und Jie Sheng Wu. „The Simulation and Fatigue Life Prediction of a Cable Harness in an Industrial Robot“. Key Engineering Materials 464 (Januar 2011): 293–98. http://dx.doi.org/10.4028/www.scientific.net/kem.464.293.

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This paper presents a method to simulate the behavior of the cable harness using the absolute nodal coordinat formulation (ANCF) and to predict the fatigue life while computing the strain time history of the point of interest. Rigid body dynamics is applied for the robot system, while ANCF is used for the cable harness. The simulation is performed by using the dynamic analysis process. The material property of the cable is obtained by a test. A simplified model is prepared. With these data, the behavior of the cable is simulated and the fatigue life is predicted.

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Hui, Liu. „Dynamic Characteristics of a Long-Span Cable-Stayed Bridge“. Key Engineering Materials 480-481 (Juni 2011): 1496–501. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.1496.

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In order to study the dynamic characteristics of a super-long-span cable-stayed bridge which is semi-floating system, the spatial finite element model of this cable-stayed bridge was established in ANSYS based on the finite element theory.Modal solution was conducted using subspace iteration method, and natural frequencies and vibration modes were obtained.The dynamic characteristics of this super-long-span cable-stayed bridge were then analyzed.Results showed that the super-long-span cable-stayed bridge of semi-floating system has long basic cycle, low natural frequencies, dense modes and intercoupling vibration modes.

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Rudolf, Robert T., Florian Roscheck, Yuuta Aono und Torsten Faber. „Mass-Optimized Design of Guyed Wind Turbine Tower Using Struts“. Key Engineering Materials 577-578 (September 2013): 277–80. http://dx.doi.org/10.4028/www.scientific.net/kem.577-578.277.

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Continuing upscaling trends in turbine height, rotor diameter, and rated power have resulted in massive, expensive tower structures. A modified guyed tower concept with struts (GTS) is proposed for saving material, and the basic design is made for a 2.5MW turbine. The tower and cable dimensions are optimized for lowest system cost given yield constraints. DACE (design and analysis of computer experiments) methods of sampling and surrogate model optimization are used for efficient parameter study and optimization of the ABAQUS finite element model using DAKOTA software. The resulting design is highly effective in transferring turbine loads from the tower to the cables. A mass savings of 41% is calculated vs. conventional structures, and further investigation of the GTS is recommended for both onshore and offshore applications. Additionally, the concept of retowering older turbines is introduced and proposed as an economic alternative to the common practice of repowering old wind farms with larger, new machines. The GTS is specifically suited to this application. Lastly, the design methodology developed for this study is shown to be effective and efficient; it can be applied for the massoptimization of similar cablesupported truss structures.

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Zheng, G., Yi Qing Ni, J. M. Ko und X. Xu. „Tension-Dependent Internal Damping of a Cable Model“. Key Engineering Materials 243-244 (Juli 2003): 415–20. http://dx.doi.org/10.4028/www.scientific.net/kem.243-244.415.

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Bi, Hong Tao, und Yan Li. „The Ratio Optimization of Side to Main Span in Low-Pylon Cable-Stayed Bridge Based on Yudao River Bridge“. Key Engineering Materials 574 (September 2013): 177–84. http://dx.doi.org/10.4028/www.scientific.net/kem.574.177.

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This paper presents an optimization model for investigating the influence on the ratio of side to main span in low-pylon cable-stayed bridge. Based on the structural analysis theory of cable-stayed bridge and combined with engineering practical, the optimization model considered that adjusting structural internal force by means of changing the side span length. Comparing and analyzing the optimization index in the result, the reasonable ratio of side to main span to this kind of bridge can be getting.

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Gao, Xiu Yun, und Yi Tan Jiang. „Seismic Response Analysis to Half Floating System of Cable-Stayed Bridge“. Key Engineering Materials 619 (Juli 2014): 81–90. http://dx.doi.org/10.4028/www.scientific.net/kem.619.81.

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According to the Chaoyang town east bridge design data, build the model with finite element analysis method. Based on two levels fortification, two stage design ideas of seismic design, modal response spectrum and seismic response of the nonlinear time history analysis method are used respectively. The nonlinear effect of the boundary conditions are considered in the analysis process, and the seismic response of the cable-stayed bridge is obtained, providing bases and presenting methods for aseismic design of Chaoyang town east bridge.

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Bin, Li. „Research and Development for Cable Industry-Oriented Manufacturing Process Information System Based on Rough Set Theory“. Key Engineering Materials 467-469 (Februar 2011): 1273–79. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.1273.

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The characters of the Manufacturing Process Information System (MPIS) for industry-oriented are included here. The characters of the process and the difficulty faced for cable industry are summarized. Then, A model structure of MPIS for cable industry is established. A method based on Rough Set Theory for processing plan knowledge system is put forward. An example for processing knowledge finding is studied at last.

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Rong, Rui, Yu Hui Shan, Li Zhao und Bao Qun Wang. „Model Test of Steel-Concrete Composite Beam Deck under Negative Moment“. Key Engineering Materials 871 (Januar 2021): 340–48. http://dx.doi.org/10.4028/www.scientific.net/kem.871.340.

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In order to understand the mechanical properties and force transfer law of steel-concrete composite beam deck under negative bending moment, and further guide the design. Based on a steel-concrete composite girder cable-stayed bridge, the model test of the mechanical behavior of the steel-concrete composite girder deck under the action of negative moment was carried out. The characteristics of mechanical failure and mechanical properties were analyzed.

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Li, Shun Long, Hui Li, Jin Ping Ou und Hong Wei Li. „Integrity Strain Response Analysis of a Long Span Cable-Stayed Bridge“. Key Engineering Materials 413-414 (Juni 2009): 775–83. http://dx.doi.org/10.4028/www.scientific.net/kem.413-414.775.

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This paper presents the analysis of strain time histories measured by structural health monitoring system. The main objective of this study is to prepare data for reliability estimation of main components as well as the entire structural system. The strain and corresponding temperature data is collected at the following stages: closure segment reconstruction stage and operating stage. The strain monitoring of the closure segment during the reconstruction stage provided valuable information on early-life strain development and reference characteristics for events such as post tensioning and temperature change. These lessons learnt from the reconstruction monitoring can be used for understanding subsequent bridge behavior, including damage detection and reference points of subsequent monitoring. Specially, the loading test results reveal the effectiveness and correctness of the strain acquiring system and provide evidence for reliable long-tem monitoring. Strain and temperature data have been recorded at sampling frequency of 62.5Hz since loading test, which would provide information linear stress-strain relationships. The long-term creep and shrinkage model were provided by Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridge and Culverts (JTG D62-2004). Through the statistical analysis of the online strain response, the probability model of long-term performance under environmental and random traffic loading are obtained which gives the potential of its application of reliability based assessment on cable stayed bridges where they evaluated the reliability of elements such as cables and stiffening girder.

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Zhang, Dan, Dun Wen Zuo, Guang Ming Jiao, Jian Xie, Hua Lin Zhou und Yi Liang Chen. „Study on Mixed Assembly Modeling of Rigid and Flexible Parts for Aerospace Product Virtual Assembly“. Key Engineering Materials 431-432 (März 2010): 9–12. http://dx.doi.org/10.4028/www.scientific.net/kem.431-432.9.

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According to the characteristics of aerospace product, the model representation and storage of the rigid part and cable harness is proposed. The Dendritic Correlative Model of Mixed Assembly of Rigid and Flexible Parts (DCMMA-RFP) is introduced based on the hierarchical model and graph model. The assembly model which realizes the lightweight storage can clearly represent the hierarchy relation and assembly process of aerospace products. The assembly modeling process in the virtual assembly environment is detailed described. Finally the effectiveness of DCMMA-RFP is verified by an example.

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Petitprez, Matthieu, und Katia Mocellin. „Numerical Study of a Crimped Assembly Mechanical Strength“. Key Engineering Materials 554-557 (Juni 2013): 1037–44. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.1037.

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Electrical contact crimping is a mechanical fastening process commonly used in aeronautical and aero spatial applications. In order to ensure the perfect electrical conduction and acceptable mechanical properties, the assembly have to fullfil some drastic holding force criteria. This outfit is directly dependent on the indentation depth at the end of crimping. The feedback generally reveals that an over crimping will lead to the cable breakage whereas an under crimping will be characterized by the cable sliding into the contact during pulling. The optimal behavior is a combinaison of both phenomena : the cable must become thinner before slipping into the contact. Numerical simulation is an efficient tool to limit the tedious experimental tests. It is the main topic of our work. This paper deals with prediction of the failure type and the force level required to tear out a contact crimped on multistrand cable for different indentation depths. The determination of optimal crimping condition is determined. In order to simulate the contact tensile test, crimping simulation has to be performed. The first step is then to be able to simulate accurately the crimping stage by using appropriate behavior laws and realistic conditions. One difficulty is linked to the small size of our objects. The first one is a 19 strands cable, in which each strand is about 0.15 mm diameter. The second sample is a 1 mm diameter cylindrical copper contact measuring 7 mm long. Adapted testing devices are described. Geometries and mechanical fields are obtained and then exported in the mechanical holding model to ensure realistic prediction [1]. Impact of crimping conditions on the pulling results is discussed. Pulling simulation results are compared to experimental values. The prediction of breakage mechanisms is also studied. Keywords: Crimping process, mechanical fastening operation, finite element computations, mechanical strength, breakout force, tensile test. [1] Fayolle, S., 2008, Etude de la modélisation de la pose et de la tenue mécanique des assemblages par déformation plastique : application au rivetage auto poinçonneur, Thèse de l'Ecole des Mines de Paris.

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Zhang, Zhong Lin, Li Quan Wang und Xiu Fen Ye. „Design and Affect about Parameter to Capability Research on Driving Device of Puncturing Mud Robot“. Key Engineering Materials 419-420 (Oktober 2009): 613–16. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.613.

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Puncturing mud robot is a kind of trenchless device that can walk by itself in the earth. There are abroad appliance foreground and developing value as it can mainly pave PE pipe,PVC pipe,cable and optical fiber cable under the mud. Through researching on impacting construction of steerable air-powered impact mole in trenchless technology at home and abroad, the driving device of puncturing mud robot was designed. The device machinery character and work principle is recounted and device three-dimensional model was established and device virtual assembly was finished. The parameter equation of driving device was educed and effect from main parameter to output capability was analyzed. Based on analysis result, testing of impacting capability about driving device was put up and the academic result of the impacting capability was validated. The testing result indicates also that this driving device can meet puncturing power need. This paper can provides reference for collectivity design of puncturing mud robot.

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Gradov, Oleg V., Margaret A. Gradova, Anatoly A. Olkhov und Alexey L. Iordanskiy. „Charge Propagation along the Polymer Fiber of Polyhydroxybutyrate: Is it Possible to Apply the Cable Model?“ Key Engineering Materials 869 (Oktober 2020): 246–58. http://dx.doi.org/10.4028/www.scientific.net/kem.869.246.

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This article considers experimental data on the surface charge propagation along the dielectric polymer fibers. Nonwoven polymer materials based on polyhydroxybutyrate obtained by electrospinning technique were used as an example of dielectric fibers in our experiments. Polymer fiber charging was investigated under the electron beam in a vacuum chamber of the scanning electron microscope. The fiber electric response registration was performed in a TV mode and in dynamic conditions using oscilloscopic sectioning visualization. Digitized images were processed using specialized software by Sobel-Feldman operator (Sobel filter), visualizing isopotential lines of the electron beam-induced emission. The results obtained were analyzed in the framework of the Roll’s cable model, which has been extrapolated from the electrical signal transduction along the nerve fibers to the charge propagation along the dielectric polymer fibers.

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Bai, Bing, und Jing Guo. „Dynamic Characteristics Analysis of Long-Span Cable-Stayed Bridge with Steel Truss Stiffening Girder“. Key Engineering Materials 737 (Juni 2017): 481–87. http://dx.doi.org/10.4028/www.scientific.net/kem.737.481.

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With the development of transportation, more and more long-span floating system steel truss-stiffened cable-stayed bridges have been built. Due to the non-restraint in longitudinal direction, this kind of bridges possess very superior performance in the dissipation of vibration energy. On account of the characteristics above, the paper intends to discuss the dynamic behavior of this type of bridges. Based on a real structure design, the numerical simulation procedure of the vibration has been introduced. According to a series of assumptions, the dynamic 3D FEM model of the bridge is established firstly. Thereafter, the vibration characteristics of the model are evaluated. Results show that the longitudinal stiffness is relatively small in comparison to the torsional stiffness. The 1st order mode is longitudinal floatation of girders and pylons. But overall the bridge is still rather flexible.

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Kakemoto, Hirofumi, Satoshi Wada und Takaaki Tsurumi. „Reflection Intensity Measurement for Dielectric Material Using a Microwave Single Probe and Its Electromagnetic Field Analysis“. Key Engineering Materials 301 (Januar 2006): 125–28. http://dx.doi.org/10.4028/www.scientific.net/kem.301.125.

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Microwave reflection intensity for microwave absorber, Cu-plate and Al2O3 (0001) single crystal substrate was measured from 8GHz to11GHz as a function of distance between single probe and sample at room temperature. The minimum reflection intensity was observed in the distance of 0.2mm between single probe and sample at 9.4GHz, although the reflection intensity was decreased with increasing distance in other measurement frequencies. The electromagnetic field analysis was hence carried out for simulation model that is defined with coaxial cable, probe and sample using finite differential time domain method. The reflection coefficient and impedance for simulation model were calculated, and compared to the experimental data. From results of electromagnetic analysis, the minimum point of reflection intensity was caused from an impedance matching.

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Domaneschi, Marco, Maria Pina Limongelli und Luca Martinelli. „Interpolation Damage Detection Method on a Suspension Bridge Model: Influence of Sensors Disturbances“. Key Engineering Materials 569-570 (Juli 2013): 734–41. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.734.

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In this paper the IDDM (Interpolation Damage Detection Method), recently proposed as a speedy damage detection and localization technique, is applied to the numerical model of a cable suspended bridge derived from the ANSYS model of the Shimotsui-Seto Bridge in Japan (940m length of the main span). The wind excitation is simulated as a spatially correlated process acting in the horizontal direction, transversal to the deck. The bridge is assumed to be monitored by sensors located at the nodes of the model along the longitudinal axis, and recording the absolute acceleration of the bridge deck in the transversal direction Noise in recorded responses can reduce the sensitivity of the method to damage. The influence of noise on the results of the damage detection method is herein investigated by adding a white-noise signal to the structural responses. The mutual relationship between level of noise, intensity of damage and lengths of recorded signals is also investigated with reference to various damage scenarios.

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Liu, Jian Hua, Wei Shen Zhu und Shu Cai Li. „Numerical Analysis of 3-D FLAC on Supporting Effects of Underground Caverns Surrounding Rockmass of Xiao Lang Di Key Water Control Project“. Key Engineering Materials 306-308 (März 2006): 1467–72. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1467.

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This present paper describes the process and methods of the numerical analysis, including yielding criterion, 3-D geometrical model, rock mass mechanical parameters, initial geostress field, method to simulate excavation process, simulation method for supporting structures. Then, the paper gives the computational results of rock deformation and stability for the large cavern group and comparisons for three cases: with no supporting structures; with bolts and shotcrete lining but no prestress-cables and with all the supporting structures of bolts, cables and lining. Finally, the paper reaches several conclusions.

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Qiu, Chang Hua, Qiang Song und Li Jie Zhou. „Layout Optimization of Mooring Base of the Ship-Based Helicopter Based on FEM“. Key Engineering Materials 419-420 (Oktober 2009): 649–52. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.649.

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The ship-based helicopter is always dangling in the sea because of winds and waves. It is necessary to analyze and calculate the mooring of helicopter. In order to void the complex derivation of mathematical formulas, the parameterized finite element method (FEM) model about the ship-based helicopter body, mooring cable and mooring base is established with the software ADAMS. This model is used to calculate the mooring tension and optimize the locations of the mooring bases. In the various layouts of the mooring bases, the minimal mooring tension is the layout optimization object. After some added constraint conditions are considered, the mooring point coordinates are searched and calculated in the standard and nonstandard parking positions with subproblem approximation method. Through the comparison and analysis of the relative changing ratio of the position coordinates, the final optimization layout scheme is obtained.

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Uhl, Tadeusz, Artur Hanc, Krzysztof Tworkowski und Łukasz Sekiewicz. „Wireless Sensor Network Based Bridge Monitoring System“. Key Engineering Materials 347 (September 2007): 499–504. http://dx.doi.org/10.4028/www.scientific.net/kem.347.499.

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This paper presented idea and implementation of efficient, reliable wireless bridge monitoring system. The system using Wireless Sensor Network to collect the related environment parameters (vibrations, temperature, humidity) and transmitting data to the main server. The system eliminates stand-alone laboratory benchtop equipment sets and cable-based, hard-wired sensor networking. Modern MEMS technology for vibrations measurement and integrated humidity/temperature sensors application for structural monitoring is presented. Data collected by the wireless monitoring system is compared to data from a traditional wired monitoring system. Both – traditional and wireless collected data that can be used to accurately identify modal frequencies and mode shapes of the bridge. Case study of the system on bridge located over Vistula river in Krakow is shown.

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Diaferio, Mariella, Dora Foti und N. I. Giannoccaro. „Identification of the Modal Properties of a Building of the Greek Heritage“. Key Engineering Materials 628 (August 2014): 150–59. http://dx.doi.org/10.4028/www.scientific.net/kem.628.150.

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In this paper, the experimental modal identification analysis of the public building “San Giacomo” in Corfu (Greece) is illustrated. It represents the unique example of a structure built utilising carves stones inside the city of Corfu. The building has a rectangular plan shape with dimensions 24.75 x 14 m, and height 9 m; all the floors are made by wood. The monitoring system consists of several elements properly connected: the units of acquisitions or piezoelectric accelerometers (in total 18 installed on the different walls) with a sensitivity of 1000 mV/g; the data acquisition system or DAQs positioned at each monitored level; the laptop with an acquisition software; the cables that connect all elements to each other. The paper describes the phases of the investigations, the technical details of the performed in-situ tests, the first identified frequencies of the building by means of the classical methods of Operational Modal Analysis (OMA) and the comments about the acquired data.

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Mezzi, Marco, Gianluca Nestovito, Paolo Petrella und Vincenzo Cefaliello. „Innovative Suspended Superstructure for the Retrofitting of a Steel Truss Railway Bridge“. Key Engineering Materials 763 (Februar 2018): 1121–28. http://dx.doi.org/10.4028/www.scientific.net/kem.763.1121.

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The bridge in Poggio Renatico crossing the Reno river on the railway line between Bologna and Ferrara, consists of steel decks supported by masonry abutments and piers, while foundations and pier caps are made of reinforced concrete. After the 2012 Emilia Earthquake and accounting for the fluvial erosion below the piers foundations, a structural assessment of the bridge was carried out in accordance with to the current Italian rules. Although a sufficient structure capacity against the actual transit loads resulted, the bridge showed some inadequacies with respect to the load models provided by both the national standard for constructions and the guidelines of the Italian railway network company. The retrofitting project consists of an improvement of the structural capacity of all the elements: girders, piers and abutments. An innovative retrofitting solution provides for the strengthening of the existing decks through a suspension system of cables anchored to steel towers standing on both abutments and piers and creating a kind of suspended bridge. The retrofitting is compatible with the normal scheduled interruptions of the rail traffic thereby reducing the maintenance costs of the railway system. The structural solution represents a model easily replicable to solve analogous situations along the railway network.

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Yeh, Tung-Hsin, Jiin Yuh Jang, Yu Bin Chen und Der Her Wang. „Numerical Modeling and Design of an Inspection Device with Thermoelectric Coolers for the Coke Oven“. Key Engineering Materials 419-420 (Oktober 2009): 29–32. http://dx.doi.org/10.4028/www.scientific.net/kem.419-420.29.

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In order to inspect on wall condition inside the coke oven, an inspection device has been developed to protect a camera inside and sustains high temperature long enough so that it can be permanently-installed on the pusher ram beam. The temperature of the coking chamber during operation is about 1200 °C while the maximum tolerable temperature of a camera is less than 40 °C. The device has to function as a good thermal insulator with cooling element for the camera at the pusher head and for signal cables along the beam. In this paper, the necessary conditions of the inspective device were found out by building a three-dimensional numerical model of the device to simulate the temperature distribution inside the device with CFD commercial software.

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Lamus Báez, Fabián Augusto, Carlos Felipe Urazán Bonells und Sofía Andrade Pardo. „Modular Footbridges of Guadua Angustifolia Kunth“. Key Engineering Materials 668 (Oktober 2015): 218–26. http://dx.doi.org/10.4028/www.scientific.net/kem.668.218.

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In South America, especially in the Andean region, many communities are isolated and their development is limited due to the difficulties in communicating with urban areas, because the lack of adequate road infrastructure. Most of this problem is due to economic issues and lack of attention from governments. Moreover, the Guaduaangustifolia Kunth (Guadua-a.) is a bamboo that grows in most of the Americas. This material has a resistance – weight ratio similar to structural steel also presenting additional benefits such as soil stabilization, flow regulation, and a high CO2 fixation rate to the ground. In addition the Guadua-a. growth cycle spans from 3 to 5 years. All of these makes the Guadua-a. in highly renewable material. This paper presents an alternative for the construction of Guadua-a. structural modules for pedestrian bridges, as a solution to the lack of infrastructure in village roads and even in suburban areas. In the proposed model, the bridge would be built by the community in a short time, taking advantage of existing Guadua-a. in the area, and establishing an industrialized cultivation of it, to enable them to have enough material for maintenance and replacement of sections as necessary. A numerical structural analysis was performed to determine the maximum possible span under load specifications from Colombian bridge building code. The results shows that a bridge up to 21m of span can be constructed using the module. The span can be increased drastically when the module is combined with wire-cable or an arc shaped configuration, however, the module was assessed to be used in straight truss bridges because this setting carries the largest loads on the elements. Real scale load tests were conducted on a full scale physical model of the module, the structural elements and the connection between the modules.

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Abrukov, Viktor S., Konstantin V. Efimov, Nikolai A. Tarasov und Nikolay I. Kol'tsov. „STUDY OF INFLUENCE OF STABILIZERS ON BURNING OF SILICONE RUBBER WITH HELP ARTIFICIAL NEURAL NETWORKS“. IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, Nr. 1 (21.12.2017): 84. http://dx.doi.org/10.6060/tcct.20186101.5559.

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Silicone rubbers are used for manufacturing fireproof insulating sheaths for cables and high voltage insulators. Highly oil-resistant silicone rubber of brand IRP 1338 of JSC “Kazan plant of synthetic caoutchouc” production should be singled out among silicone rubbers. This rubber is made from synthetic caoutchouc SKTV and contains Aerosil A-300, titanium oxide, fumed silica U-333 curing agent Perkadox BC-FF and anti-structuring agent ND-8 - α,ω-polydimethyl-siloxanediol. Previously we investigated the kinetics of combustion process of this rubber containing anti-structuring agent ND-8 as well as Ca/Zn-stabilizer Kompanoks (2,6-bis((3,5-di-tert-butyl-4-hydroxyphenyl)methyl)cyclohexane-1-one) and their combination which are used to enhance the thermal stability of the rubbers on the basis of carbon-chain caoutchoucs. In given paper using artificial neural networks (ANN) the computational multifactor model of combustion of rubber IRP 1338 has been obtained. The influence of selected stabilizers on the combustion rate of silicone rubber IRP 1338 has been studied. The combustion process was investigated by measuring at different points in time the relative height of the unburned portion of the rubber samples in the form of standard rectangular bars with a size of 10x2x2 mm. Combustion occurred under the action of the infrared beam (wavelength 10.6 μm) of laser LG-25 at three temperatures radiation (800, 900, 1000°C). As the main factors influencing the combustion of rubber, the laser radiation temperature was chosen, under which the forced combustion of rubber occurred. The nature of the stabilizers introduced into the rubber and the combustion temperature of the rubber was measured by a thermocouple placed on the surface of combustion rubber. The objective function of ANN-model was the relative height of the unburned portion of the rubber samples. Moreover, it was believed, the greater the relative height of the unburned portion of the rubber samples, the lower the burning rate and the higher the efficiency of the stabilizer. The received ANN-model has allowed to reveal three stages of combustion of rubber and to investigate features of influence of stabilizers on process of combustion. It was established that from the three stabilizers studied, the Ca/Zn stabilizer most effectively slows down the combustion of rubber due to the interaction of calcium oleates and zinc of this stabilizer with caoutchouc molecules. Thus, the possibility of increasing the fire resistance of rubber based on the silicone rubber SKTV by replacing the anti-structuring agent ND-8 on the Ca/Zn stabilizer has been established.Forcitation:Abrukov V.S., Efimov K.V., Tarasov N.A., Koltsov N.I. Study of influence of stabilizers on burning of silicone rubber with help artificial neural networks. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 1. P. 84-88

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