摘要
基于结构动力学原理,提出了一种在Pushover分析中考虑应变率效应的方法:首先,对结构进行不考虑应变率效应的Pushover分析;然后,计算顶点位移为Di时,1/4循环的时间和关键点在1/4循环内的应变变化量,根据关键点在1/4循环内的平均应变率对模型进行修正,进行第2次Pushover分析,得到Pushover曲线上的一个点(Di,Vi),改变Di的值,按照该方法得到一系列Pushover曲线上的点;最后,将各个点用光滑曲线连接,得到结构考虑应变率效应的Pushover曲线。采用一个钢筋混凝土模型对该方法得到的Pushover曲线和逐步增量非线性时程分析方法得到的结果进行了对比。结果表明:该方法具有合理性。
Based on the dynamic theory of structures,a Pushover analysis method considering strain rate effect was proposed.Firstly,Pushover analysis of the structure without considering strain rate effect was performed.Secondly,the variance of strain at the important points in the 1/4 cycle and the duration of the cycle corresponding to the top displacement D_i were calculated,then the model could be modified according to average strain rates of the important points;Pushover analysis of the structure for the second time was performed,and a point（D_i,V_i） in the Pushover curve could be obtained;the value of D_i was changed,and many points could be got according to the method.Finally,the Pushover curve of the structure considering strain rate effect by connecting these points with smooth curve was obtained.Using a reinforced concrete model,the Pushover curve obtained by the method in the paper was compared with the result obtained by incremental dynamic analysis.Results show that the method is rational.
出处
《建筑科学与工程学报》
CAS
2011年第2期69-74,共6页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金重大研究计划项目(90815026)
国家地震专项科研项目(200808074)
高等学校学科创新引智计划项目(B08014)
