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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 841-852页

作者： Tang Tingxuan He Jun Department of Civil Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

This paper describes the quasi-static testing and analytical modelling of the Hysteretic behavior of aluminum alloy rigid bus-flexible connectors of 220 kV electrical substations.The main objective of the study is to experimentally investigate the Hysteretic behavior of six different types of rigid bus-flexible connectors 220 kV electrical substations when subjected to cyclic loading.Another objective is to theoretically study the flexibility and effectiveness of a previously proposed analytical model in fitting the experimental hysteresis loops of the tested rigid bus-flexible connectors.The experimental investigation indicates that the tested rigid bus-flexible connectors exhibit highly asymmetric hysteresis behavior along with tension stiffening effect.The theoretical study demonstrates that the generalized Bouc-Wen model has high flexibility and is effective in fitting the experimental hysteresis resisting force-displacement curves of the six tested rigid bus-flexible connectors.

关键词： rigid bus-flexible connectors 220 kV electrical substations Hysteretic behavior experimental curves analytical model

Discrete element method study of Hysteretic behavior and deformation characteristics of rockfill material under cyclic loading

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第4期24卷 350-365页

作者： Mingchun LIN Guanqi WANG Jian ZHOU Wei ZHOU Ni AN Gang MA State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Institute of Water Engineering Sciences Wuhan UniversityWuhan 430072China Power China Chengdu Engineering Co. Ltd.Chengdu 610072China Power China Kunming Engineering Co. Ltd.Kunming 650051China

Granular geomaterials under different loading conditions manifest various behaviors,such as hysteresis.Understanding their Hysteretic behavior and deformation characteristics is the basis for establishing a constitutive relation with excellent performance in deformation prediction.The deformation characteristics of crushable particle materials are analyzed through a series of cyclic loading tests conducted by numerical simulation.The Hysteretic behavior is investigated from a particle scale.The increase in particles with contacts less than two may be responsible for the residual strain,and the particle breakage further promotes particle rearrangement and volume contraction.Both the accumulation of plastic strain and the resilient modulus are found to be related to confining pressures,stress levels,cyclic loading amplitudes,and the number of cycles.The plastic strain accumulation can be written as a function of the number of cycles and an evolution function of resilient modulus is proposed.

关键词： Granular material Discrete element method(DEM) Plastic deformation Cyclic loading Hysteretic behavior

Finite element analysis of an all-steel buckling-restrained brace

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Earthquake Engineering and Engineering Vibration 2022年第4期21卷 1119-1135页

作者： Jiang Tao Dai Junwu Yang Yongqiang Bai Wen Pang Hui Liu Rongheng Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChinaEarthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China

Typical all-steel buckling-restrained braces(BRBs)usually exhibit obvious local buckling,which is attributed to the lack of longitudinal restraint to the rectangle core plate.To address this issue,all-steel BRBs are proposed,in which two T-shaped steel plates are adopted as the minor restraint elements to restrain the core plate instead of infilled concrete or mortar.In order to investigate the factors that characterize the hysterical responses of this device,different finite element(FE)models are developed for the specific context.The FE models are developed based on nonlinear finite element software,which incorporate continuum(shell or brick)elements,large displacement,and deformation formulations.In these FE models,two different steel constitutive models are adopted to precisely reproduce the cyclic response of the BRB component.Meanwhile,comparisons between the numerical and experimental results are conducted to validate the effectiveness and accuracy of the robust FE model.The agreements between experimental observations and numerical predictions demonstrate that the FE method could be utilized for in depth parametric analysis.Furthermore,BRBs with detailed configurations can provide excellent Hysteretic behavior and seismic performance through the optimal design process.

关键词： steel BRB T-shaped steel finite element model optimal design Hysteretic behavior

An effective simplified model of composite compression struts for partially-restrained steel frame with reinforced concrete infill walls

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 403-415页

作者： Sun Guohua Chuang-Sheng Walter Yang Gu Qiang Reginald DesRoches School of Civil Engineering Suzhou University of Science & Technology School of Civil and Environmental Engineering Georgia Institute of Technology

To resolve the issue regarding inaccurate prediction of the Hysteretic behavior by micro-based numerical analysis for partially-restrained（PR）steel frames with solid reinforced concrete（RC）infill walls,an innovative simplified model of composite compression struts is proposed on the basis of experimental observation on the cracking distribution,load transferring mechanism,and failure modes of RC infill walls filled in PR steel frame.The proposed composite compression struts model for the solid RC infill walls is composed ofαinclined struts and main diagonal struts.Theαinclined struts are used to reflect the part of the lateral force resisted by shear connectors along the frame-wall interface,while the main diagonal struts are introduced to take into account the rest of the lateral force transferred along the diagonal direction due to the complicated interaction between the steel frame and RC infill walls.This study derives appropriate formulas for the effective widths of theαinclined strut and main diagonal strut,respectively.An example of PR steel frame with RC infill walls simulating simulated by the composite inclined compression struts model is illustrated.The maximum lateral strength and the hysteresis curve shape obtained from the proposed composite strut model are in good agreement with those from the test results,and the backbone curve of a PR steel frame with RC infill walls can be predicted precisely when the inter-story drift is within 1%.This simplified model can also predict the structural stiffness and the equivalent viscous damping ratio well when the inter-story drift ratio exceeds 0.5%.

关键词： PR connection steel frame infill walls shear connector Hysteretic behavior strut

Experimental study of the restoring force mechanism in the self-centering beam （SCB）

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Frontiers of Structural and Civil Engineering 2016年第3期10卷 272-282页

作者： Abhilasha MAURYA Matthew R. EATHERTON Department of Civil and Environmental Engineering Virginia Tech Blacksburg VA 2406 USA

In the past, several self-centering （SC） seismic systems have been developed. However, examples of selfcentering systems used in practice are limited due to unusual field construction practices, high initial cost premiums and deformation incompatibility with the gravity framing. A self centering beam moment frame （SCB-MF） has been developed that mitigates several of these issues while adding to the advantages of a typical SC system. The self-centering beam （SCB） is a shop-fabricated, self-contained structural component that when implemented in a moment resisting frame can bring a building back to plumb after an earthquake. This paper describes the SCB concepts and experimental program on five SCB specimens at two-third scale relative to a prototype building. Experimental results are presented including the global force-deformation behavior. The SCBs are shown to undergo 5%-6% story drift without any observable damage to the SCB body and columns. Strength equations developed for the SCB predict the moment capacity well, with a mean difference of 6% between experimental and predicted capacities. The behavior of the restoring force mechanism is described. The limit states that cause a loss in system＇s restoring force which lead to a decrease in the selfcentering capacity of the SCB-MF, are presented.

关键词： self-centering seismic system seismic design Hysteretic behavior restoring force resilient structural system

Parameter identification of hysteretic model of rubber-bearing based on sequential nonlinear least-square estimation

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Earthquake Engineering and Engineering Vibration 2010年第3期9卷 375-383页

作者： Yin Qiang Zhou Li Wang Xinming MOE Key Lab of Structure Mechanics and Control for Aircraft Institute of Structures ＆ Strength Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In order to evaluate the nonlinear performance and the possible damage to rubber-bearings （RBs） during their normal operation or under strong earthquakes, a simplified Bouc-Wen model is used to describe the nonlinear Hysteretic behavior of RBs in this paper, which has the advantages of being smooth-varying and physically motivated. Further, based on the results from experimental tests performed by using a particular type of RB （GZN 110） under different excitation scenarios, including white noise and several earthquakes, a new system identification method, referred to as the sequential nonlinear least- square estimation （SNLSE）, is introduced to identify the model parameters. It is shown that the proposed simplified Bouc- Wen model is capable of describing the nonlinear Hysteretic behavior of RBs, and that the SNLSE approach is very effective in identifying the model parameters of RBs.

关键词： parameter identification rubber-bearing Hysteretic behavior Bouc-Wen model sequential nonlinear least- square estimation

EXPERIMENTAL STUDY ON LIGHT STEEL FRAME UNDER CYCLIC LOADING

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EXPERIMENTAL STUDY ON LIGHT STEEL FRAME UNDER CYCLIC LOADING