The Experts below are selected from a list of 10182 Experts worldwide ranked by ideXlab platform
Hai Tao Zhou - One of the best experts on this subject based on the ideXlab platform.
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collapse mechanism of single layer cylindrical latticed shell under Severe Earthquake
2020Co-Authors: Hai Tao Zhou, Yi Gang ZhangAbstract:In this paper, the results of finite element analyses of a single-layer cylindrical latticed shell under Severe Earthquake are presented. A 3D Finite Element model using fiber beam elements is used to investigate the collapse mechanism of this type of shell. The failure criteria of structural members are simulated based on the theory of damage accumulation. Severe Earthquakes with peak ground acceleration (PGA) values of 0.5 g are applied to the shell. The stress and deformation of the shell are studied in detail. A three-stage collapse mechanism “double-diagonal -members-failure-belt” of this type of structure is discovered. Based on the analysis results, measures to mitigate the collapse of this type of structure are recommended.
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progressive collapse analysis of reticulated shell structure under Severe Earthquake loading considering the damage accumulation effect
Journal of Performance of Constructed Facilities, 2018Co-Authors: Hai Tao Zhou, Yi Gang ZhangAbstract:A reticulated shell is one of the conventional long span space structures, prone to progressive collapse under a Severe Earthquake due to its unique single layer feature. This is. However, the collapse mechanism of this type of structure is not well studied. In this paper, a numerical modelling technique using the fiber beam elements is developed. The correspondent material model based on the inclusion of damage accumulation was also developed in order to determine the failure criteria of structural members. An effective way to simulate the buckling behavior of the structural members is also used in the numerical simulation. The relevant numerical method is developed and validated against experimental tests: good agreement is achieved. Based on this numerical method, a parametric study of the reticulated shell under Severe Earthquake loading is performed and the responses of the structure is investigatedand a three-stages collapse mechanism of this type of structure was observed.
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simulation method on progressive collapse of shell model under Severe Earthquake
Advanced Materials Research, 2010Co-Authors: Hai Tao Zhou, Yi Gang Zhang, Da Bin YangAbstract:To analysis progressive collapse behavior of single-layer reticulated shell under Severe Earthquake, based on spatial fiber beam element failure criteria, a simulation method on progressive collapse of shell is presented, which account of mechanical properties of components after buckling and damage accumulation effect of combine hardening material. And a computation program is developed correspondingly. At last the method and program proves to be applicable by an example.
Yi Gang Zhang - One of the best experts on this subject based on the ideXlab platform.
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collapse mechanism of single layer cylindrical latticed shell under Severe Earthquake
2020Co-Authors: Hai Tao Zhou, Yi Gang ZhangAbstract:In this paper, the results of finite element analyses of a single-layer cylindrical latticed shell under Severe Earthquake are presented. A 3D Finite Element model using fiber beam elements is used to investigate the collapse mechanism of this type of shell. The failure criteria of structural members are simulated based on the theory of damage accumulation. Severe Earthquakes with peak ground acceleration (PGA) values of 0.5 g are applied to the shell. The stress and deformation of the shell are studied in detail. A three-stage collapse mechanism “double-diagonal -members-failure-belt” of this type of structure is discovered. Based on the analysis results, measures to mitigate the collapse of this type of structure are recommended.
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progressive collapse analysis of reticulated shell structure under Severe Earthquake loading considering the damage accumulation effect
Journal of Performance of Constructed Facilities, 2018Co-Authors: Hai Tao Zhou, Yi Gang ZhangAbstract:A reticulated shell is one of the conventional long span space structures, prone to progressive collapse under a Severe Earthquake due to its unique single layer feature. This is. However, the collapse mechanism of this type of structure is not well studied. In this paper, a numerical modelling technique using the fiber beam elements is developed. The correspondent material model based on the inclusion of damage accumulation was also developed in order to determine the failure criteria of structural members. An effective way to simulate the buckling behavior of the structural members is also used in the numerical simulation. The relevant numerical method is developed and validated against experimental tests: good agreement is achieved. Based on this numerical method, a parametric study of the reticulated shell under Severe Earthquake loading is performed and the responses of the structure is investigatedand a three-stages collapse mechanism of this type of structure was observed.
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simulation method on progressive collapse of shell model under Severe Earthquake
Advanced Materials Research, 2010Co-Authors: Hai Tao Zhou, Yi Gang Zhang, Da Bin YangAbstract:To analysis progressive collapse behavior of single-layer reticulated shell under Severe Earthquake, based on spatial fiber beam element failure criteria, a simulation method on progressive collapse of shell is presented, which account of mechanical properties of components after buckling and damage accumulation effect of combine hardening material. And a computation program is developed correspondingly. At last the method and program proves to be applicable by an example.
W U Jinzhi - One of the best experts on this subject based on the ideXlab platform.
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mechanism of progressive collapse of spherical shell under Severe Earthquake
Journal of Beijing University of Technology, 2013Co-Authors: W U JinzhiAbstract:Based on nonlinear simulation of progressive collapse of single-layer Kiewitt spherical shell,this paper studies the characteristics of deformation,load-bearing,and damage development of members,and presents a theory called three-phase that explains the progressive collapse mechanism very well in detail.Then,the development of deformation during the three phases is analyzed under different peak ground accelonations(PGA) and thus a new description of behavior level of spherical shell is set up with a damage assessment index based on relative displacement of gravity.All the work is useful for further study on the catastrophic mechanism of space structure under Severe Earthquake.
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collapse mechanism and parameter analysis of single layer cylindrical latticed shell with longitudinal edge supports on ground under Severe Earthquake
World Earthquake Engineering, 2011Co-Authors: W U JinzhiAbstract:The collapse mechanism of single-layer cylindrical latticed shell under Severe Earthquakes is analyzed with full-range responses method based on load domain.Results show that this kind of shell takes on a very distinct one-way mechanical characteristic along the span direction,and its length to span ratio has little influence on its mechanical performance.There is a strong regularity in its collapse behaviour,and all the collapse patterns belong to the dynamic strength failure mode.Its rise to span ratio has a tremendous influence on the collapse PGA,but the influence has no fixed regularity.The collapse PGA will decrease when the roof mass increases or there is initial geometrical imperfection,but the decreased magnitude depends on the shells.
G A R Parke - One of the best experts on this subject based on the ideXlab platform.
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study of the dynamic strength of reticulated domes under Severe Earthquake loading
International Journal of Space Structures, 2005Co-Authors: Shizhao Shen, G A R ParkeAbstract:The behaviour of selected steel domes subject to Severe Earthquake loading has been investigated and reported. Particular attention has been given to assess the development and spread of plasticity throughout these structures. Several dome configurations have been considered, both perfect and imperfect, together with a range of varying rise to span ratios. Finite element analysis of these structures has been undertaken to determine the rate of spread of plasticity and the rate of increase in node displacement under seismic loading. The dynamic strength failure acceleration (DSFA) has been defined as the acceleration at which the rate of spread of plasticity and node displacement reaches a runaway level and the structure becomes dynamically unstable. For the dome structures under consideration DSFA occurred at an acceleration of approximately 8 m/s2. In addition, the DSFA decreased by 15%–50% for the imperfect structures when compared with the perfect domes and was lower for the multi-directional seismic i...
Ian D Aiken - One of the best experts on this subject based on the ideXlab platform.
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a mechanical model for elastomeric seismic isolation bearings including the influence of axial load
Earthquake Engineering & Structural Dynamics, 2009Co-Authors: Sachie Yamamoto, Masaru Kikuchi, Masaiki Ueda, Ian D AikenAbstract:For the purpose of predicting the large-displacement response of seismically isolated buildings, an analytical model for elastomeric isolation bearings is proposed. The model comprises shear and axial springs and a series of axial springs at the top and bottom boundaries. The properties of elastomeric bearings vary with the imposed vertical load. At large shear deformations, elastomeric bearings exhibit stiffening behavior under low axial stress and buckling under high axial stress. These properties depend on the interaction between the shear and axial forces. The proposed model includes interaction between shear and axial forces, nonlinear hysteresis, and dependence on axial stress. To confirm the validity of the model, analyses are performed for actual static loading tests of lead–rubber isolation bearings. The results of analyses using the new model show very good agreement with the experimental results. Seismic response analyses with the new model are also conducted to demonstrate the behavior of isolated buildings under Severe Earthquake excitations. The results obtained from the analyses with the new model differ in some cases from those given by existing models. Copyright © 2008 John Wiley & Sons, Ltd.
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component testing seismic evaluation and characterization of buckling restrained braces
Journal of Structural Engineering-asce, 2004Co-Authors: Cameron J Black, Nicos Makris, Ian D AikenAbstract:This paper reports on the results from a comprehensive component testing program on a type of buckling-restrained brace known as the Unbonded Brace™. The experimental data are used to: ~1! verify the results of theoretical predictions on the structural stability of the braces; ~2! validate the inelasitc capacity of the braces under Severe Earthquake demands; and ~3! calibrate a macroscopic hysteretic model that is found to predict, with fidelity, the brace force-displacement behavior. The study concludes that the unbonded brace is a reliable and practical alternative to conventional framing systems to enhance the Earthquake resistance of new and existing structures; capable of providing both the rigidity needed to satisfy structural drift limits, while delivering a substantial and repeatable energy absorption capability.
