采用钢结构加层的混凝土框架结构的侧向力分布比较

摘要

Pushover analysis is a simplified method for structure seismic evaluation,which is extensively used gradually,and is recommended by the new national code of seismic design of buildings.The load pattern selection is one of the critical issues in pushover analysis,especially to the RC frame after steel adding storey,for the distribution of lateral force Pushover analysis result is more significant impact.Based on the three groups of six types of framework,different lateral force distribution was selected for pushover analysis,and the nonlinear time-history analysis results were compared.The results show that,for RC frame structure after steel adding storey directly,the results obtained of different lateral force distribution of pushover are different,and the time-history analysis results of deviation bigger also.%Pushover分析方法是逐渐得到广泛应用的一种评估结构抗震性能的简化方法,已被引入我国新的建筑结构抗震设计规范。侧向力分布的选取是结构Pushover分析中的一个关键问题,尤其是对于混凝土框架直接加层钢框架结构,由于上下层间刚度比差异较大,侧向力分布对其Pushover分析的结果影响更为显著。文章通过对3组共6榀加层框架,选取不同的侧向力分布进行了Pushover分析,并与非线性时程分析结果进行了比较。比较结果表明,对于混凝土框架结构直接加层钢框架结构,不同的侧向力分布得到的Pushover分析结果差异较大,与时程分析结果的偏差也较大。