带组合H型钢梁的自复位框架受力机理及抗震性能

Analysis for stress mechanism and seismic behavior of self-centering steel frame with combined H-beam

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摘要针对提出的带组合H型钢梁的自复位框架,推导了荷载-位移曲线特征点处的抗弯承载力计算公式,采用OpenSees有限元软件建立了数值模型,在低周往复加载下和地震时程曲线作用下,对结构的抗震性能和自复位能力进行了模拟分析,并将钢绞线面积、钢绞线初始应力、消能元件截面积作为设计参数,研究其对结构抗震能力和自复位能力的影响。结果表明:有限元模型与理论推导的恢复力曲线吻合良好,有限元模型能较好地模拟该结构的主要力学特性;结构在静力和动力荷载作用下,不仅具有良好的抗震性能,残余层间位移角仅0.28%,具有良好的自复位能力;钢绞线面积、钢绞线初始应力与结构刚度成正比,与耗能能力和残余变形成反比;消能元件截面积与结构刚度、耗能能力和残余变形成正比。 For self-centering steel frame with combined H-beam,the calculating formulas of moment bearing capacity were deducted at feature points of load-displacement curve.The OpenSees finite element model was established which was used to simulate and analyze the seismic performance and self-centering capability under low cyclic loading and time-history analysis,respectively.The section area of post-tensioned stands(A PT),initial stress of PT stands(φ),section area of energy dissipation elements(A ED)as seismic design parameters were analyzed,and the rules that affect the seismic performance of self-centering steel frame were obtained.The results show the finite element model agree well with the theoretical analysis in hysteretic curve,and the finite element model can simulate the main mechanical properties of the structure.Under the static and dynamic loading,the structure not only has good seismic performance,but also has 0.28%story drift which means good self-centering capability.With the increasement of the A PT and theφ,the structure stiffness and bearing capacity increase,but the energy dissipation capacity and residual story drift decreases.With the increasement of the A ED,the structure stiffness,bearing capacity,energy dissipation capacity and residual story drift increase.

作者沈培文杨溥洪基豪胡明昊杨熠明 SHEN Peiwen;YANG Pu;HONG Jihao;HU Minghao;YANG Yiming(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Beijing CCI Architectural Design Co.,Ltd.,Chongqing Branch,Chongqing 400010,China;East China Architectural Design&Research Institute Co.,Ltd.,Southwest Center,Chongqing 400010,China)

机构地区重庆大学土木工程学院北京中外建建筑设计有限公司重庆分公司华东建筑设计研究院有限公司重庆西南中心

出处《地震工程与工程振动》 CSCD 北大核心 2020年第6期140-148,共9页 Earthquake Engineering and Engineering Dynamics

基金国家自然科学基金项目(51578093) 重庆市自然科学基金项目(cstc2018jcyjAX0061)。

关键词自复位 H型钢梁消能元件抗震性能设计参数 self-centering combined H-beam energy dissipation element seismic performance design parameter

分类号 TU391 [建筑科学—结构工程]

作者简介沈培文(1985-),男,博士研究生,主要从事结构抗震研究.E-mail:peiwenshen@cqu.edu.cn。