【摘要】 为简化多层钢框架结构在强震作用下的弹塑性时程分析,并从能量与层间位移的角度建立评价关系式,以屈曲约束支撑水平力分担率β为主要研究参数建立6个多层屈曲约束斜撑钢框架模型,对各模型静动力弹塑性分析结果进行比较研究。计算分析表明,当β为20%～60%时,各模型各层的层间位移、屈曲约束斜撑的的塑性变形能量分布以及层滞回曲线关系的静力分析值与弹塑性时程分析值基本吻合,其静力分析能够比较准确的评价强震作用下地震反应效应,其设计可采用修正底部剪力法。更多还原

【Abstract】 In order to simplify the dynamic analysis of multi-storey steel frames in strong earthquake,taking the share ratio β of horizontal force of buckling restrained brace(BRB) as the para-meter,6 multi-layer buckling restrained braced frame(BRBF) models were established,and an evaluation equation was given based on energy and storey displacement.The results revealed that the storey displacement,plastic energy distribution of buckling restrained brace and the hysteretic curve are in agreement with those given by the elastic-plastic time-history analysis when the share ratio β is between 20% and 60%.Therefore,the static analysis can evaluate the seismic response accurately in strong earthquake when frames are designed with the modified base shear method and the share ratio β between 20% and 60%.更多还原