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Cyclic testing of moment-shear force interaction in reinforced concrete shear wall substructures

Earthquake Engineering and Engineering Vibration 2020年第2期19卷 465-481页

作者： Ke Du Huan Luo Jingjiang Sun Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China

Previous quasi-static cyclic tests of shear walls,which routinely used an incremental lateral displacement test protocol with a constant axial load,failed to reflect the character of moment-shear force interaction of prototype *** study the effect of the moment-shear force interaction on the seismic performance of shear walls,three identical 2-story shear wall specimens with different loading patterns were constructed at 1/2 scale,to represent the lower portion of an 11-story high-rise building,and were tested under reversed cyclic *** axial force,shear force and bending moment were simultaneously applied to simulate the effects of gravity loads and earthquake excitations on the *** axial force and bending moment delivered from the upper structure were applied to the top of the specimens by two vertical actuators,and the shear force was applied to the specimens by two horizontal actuators.A mixed force-displacement control test program was adopted to ensure that the bending moment and the lateral shear were increased *** experimental results show that the moment-shear force interaction had a significant effect on the failure pattern,hysteretic characteristics,ductility and energy dissipation of the *** is recommended that moment-shear force interaction should be considered in the loading condition of RC shear wall substructures cyclic tests.

关键词： shear walls quasi-static cyclic test moment-shear force interaction collapse test hysteretic curves forcedisplacement mixed control test

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Nonlinear damage model for seismic damage assessment of reinforced concrete frame members and structures

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Acta Mechanica Sinica 2018年第5期34卷 949-962页

作者： Shuijing Xiao Longhe Xu Xiao Lu School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

A nonlinear damage model based on the combination of deformation and hysteretic energy and its validation with experiments are ***,a combination parameter is defined to consider the mutual effect of deformation and hysteretic energy for different types of components in different loading *** reinforced concrete (RC) columns are simulated and analyzed using the nonlinear damage *** results indicate that the damage evolution evaluated by the model agrees well with the experimental ***,the seismic damage evolution of a six-story RC frame was analyzed,revealing four typical failure modes according to the interstory drift distribution of the structure;the damage values calculated using the nonlinear damage model agree well with the four typical failure modes.

关键词： RC frame structure Nonlinear damage model Damage evolution Combination parameter hysteretic energy

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Restoring-force model of modified RAC columns with silica fume and hybrid fiber

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Journal of Central South University 2017年第11期24卷 2674-2684页

作者： YANG Tao WANG She-liang LIU Wei School of Environmental and Chemical Engineering Xi’an Polytechnic UniversityXi’an 710048China School of Civil Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Academy of Building Research of Shaanxi Provincial Xi’an 710082China

In order to establish a restoring-force model for modified concrete columns with recycled aggregates concrete(RAC), cyclic loading tests were carried out on five concretes with RAC columns and ordinary concrete frame columns under the combined influence with different admixtures and admixtures ratios(silica fume and hybrid fiber). The expressions for characteristic nodes of the skeleton curve were given by the analysis and numerical regression of the test results. In addition, the hysteretic rules of the restoring-force model and the expression for unloading stiffness were presented. Finally, we summed up the complete calculation method of the hysteretic restoring force, whose results were in good agreement with experiment. The results demonstrated that the proposed model could simulate and reflect the corresponding hysteretic behaviors, and the calculation method can provide the theoretical basis for the engineering application.

关键词： modified RAC columns skeleton curve unloading stiffness hysteretic rule restoring-force model

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External synchronization of two dynamical systems with uncertain parameters

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Science China(Technological Sciences) 2010年第3期53卷 731-740页

作者： HAN QingKai 1,SUN XiaoYu 2,YANG XiaoGuang 3 &WEN BangChun 1 1 School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110004,China 2 School of Electrical Engineering,Shenyang University of Technology,Shenyang 110023,China 3School of Mechanical Engineering,The University of Birmingham,Birmingham,B15 2TT,UK School of Mechanical Engineering & Automation Northeastern University Shenyang China School of Electrical Engineering Shenyang University of Technology Shenyang China School of Mechanical Engineering The University of Birmingham Birmingham UK

External synchronization is addressed as two or more dynamical systems with synchronous motions,which is also regarded as master-slave *** this paper,two dynamical systems,one employs a hysteretic term to model the friction phenomenon,the other involves a hardening stiffness component with the third order of displacement due to flexible deformation,are controlled to converge to the same *** control strategy is extended from feedback control for all parameters known to adaptive control for linear parameters unknown and all parameters *** slave system can keep synchronous motions with the movements of master via the designed control strategy even all the parameters are not *** stability of synchronization error,the transient process into synchronization and the effects of parameters on the designed controller using different control strategies are *** simulation results unfold the feasibility and effectiveness of this synchronization method.

关键词： controlled synchronization uncertain parameters hysteretic system Duffing system

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Simulating the Seismic Response of Concentrically Braced Frames Using Physical Theory Brace Models

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Open Journal of Civil Engineering 2013年第2期3卷 69-81页

作者： Liang Chen Lucia Tirca Department of Building Civil and Environmental Engineering Concordia University Montreal Canada Department of Civil Geological and Mining Engineering Ecole Polytechnique Montreal Canada

The aim of this paper is to assess the accuracy of brace models formulated in Drain 2DX and OpenSees by comparing the simulated results with those obtained from experimental tests. Both, Drain 2DX and OpenSees rely on the physical theory brace model. In this study, experimental tests conducted on the behaviour of structural hollow section braces subjected to symmetric and asymmetric quasi-static cyclic loading were selected for calibrating the numerical model. In addition, the predicted failure strain parameter resulted from a proposed empirical equation as a function of slenderness ratio, width-to-thickness ratio and steel properties was used to define the low-cycle fatigue material that was assigned to model braces in OpenSees. It is concluded that both Drain 2DX and OpenSees brace models give a good prediction in terms of maximum tensile and buckling force, as well as interstorey drift. However, in Drain 2DX, the brace model is not able to replicate the out-of-plan buckling and the braced frame model cannot provide an accurate response when the system experiences highly nonlinear demand. To emphasise the differences in performance between Drain 2DX and OpenSees, the behaviour of a 4-storey concentrically braced frame with zipper bracing configuration, located in Victoria, BC, was investigated.

关键词： Brace Model Plastic Hinge hysteretic Energy Seismic Response Time-History Analysis

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纤维模型非线性梁柱单元的研究及数值模拟

纤维模型非线性梁柱单元的研究及数值模拟

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第24届全国结构工程学术会议

作者：王飞钟铁毅刘海锋杨风利李清华中国电力科学研究院北京交通大学

介绍弹塑性有限元模型,研究基于刚度法的纤维单元和基于柔度法的纤维单元的工作原理,通过算例对基于刚度法的纤维单元和基于柔度法纤维单元对构件单元划分和积分点设置进行灵敏度分析,对比两种非线性单元的区别。介绍两种数值模拟方法,... 详细信息

介绍弹塑性有限元模型,研究基于刚度法的纤维单元和基于柔度法的纤维单元的工作原理,通过算例对基于刚度法的纤维单元和基于柔度法纤维单元对构件单元划分和积分点设置进行灵敏度分析,对比两种非线性单元的区别。介绍两种数值模拟方法,一种是Open SEES的改进模型,利用hysteretic材料模拟钢筋。另一种是以ABAQUS为平台,利用基于ABAQUS的一组材料单轴滞回本构模型PQ-Fiber模拟,两种模拟方法和实验结果对比,得到了较好的结果。

关键词：基于刚度法的纤维单元基于柔度法的纤维单元恢复力模型 OpenSEES ABAQUS hysteretic PQ-Fiber

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