远场地震下人字形中心支撑钢框架基于能量的性态设计方法  

Energy-Based Seismic Design Method of Chevron Concentrically Braced Steel Frame under Far-Field Earthquake

作　　者：张海东[1] 顾强[1] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011

出　　处：《建筑钢结构进展》2017年第3期9-18,共10页Progress in Steel Building Structures

基　　金：国家自然科学基金(51278320)

摘　　要：结构在远场地震作用下的损伤与地震动的循环效应密切相关,基于标准化滞回耗能谱、累积延性比谱,提出了人字形中心支撑钢框架基于能量的性态设计方法。该方法给出了各构件累积滞回耗能的计算公式及各构件截面的设计方法。采用该方法设计了一个10层人字形中心支撑钢框架,选取了15条远场地震记录,采用Pushover分析方法和非线性时程分析方法对设计结构的抗震性能进行了评估。分析结果表明:结构在罕遇地震下出现了理想的屈服机构;在多遇地震和罕遇地震下,结构层间侧移角均满足建筑抗震设计规范的要求;结构层间变形比较均匀,各层累积滞回耗能分布比较平均,证明了所提出设计方法的可靠性。Structural damage is closely related to the cyclic effect of far-field ground motion.In this paper,an energy-based seismic design method for chevron concentrically braced steel frame（CBSF）is proposed.The method is based on normalized hysteretic energy spectrum and accumulative ductility spectrum.Formulas for calculating accumulative hysteretic energy and the design methods for the sections of structural members are proposed.As an illustration example,a ten-story CBSF is designed using this method,and a total of 15far-field ground motion records are selected.The seismic behavior of the structure is evaluated by pushover and nonlinear time history analysis.The analytical results show the structure exhibits a good yielding mechanism under rare earthquake,the story drifts of the structure can meet the requirements of Code for Seismic Design of Buildings under frequent earthquake and rare earthquake,and the distribution of deformation and accumulative hysteretic energy over the height are uniform.The reliability of this seismic design method is verified.

关 键 词：远场地震 人字形中心支撑钢框架 累积滞回耗能 性态设计 非线性时程分析 

分 类 号：TU352.1[建筑科学—结构工程]