剪力墙数量对框架─剪力墙结构弹塑性性能的影响

利用弹塑性静力、动力分析软件PUSH&EPDA,对两栋框架─剪力墙结构进行了静力弹塑性和动力时程分析,考察在剪力墙具有不同数量和框架具有不同基底剪力系数这两种情形下框架的延性系数.研究结果表明,在强震作用下,当框架具有相对较小的基底剪力系数时,一旦剪力墙遭到破坏,将使框架产生较大的弹塑性位移响应,甚至导致结构的倒塌,不断增加剪力墙的数量有时将加剧这种态势;但是当框架具有较大的基底剪力系数时,框架的位移响应随着剪力墙数量的增加而逐渐减小.通过对计算结果的分析,给出了一些有益的结论,供设计人员参考.

Effects of the number of walls on the elastic-plastic response of frame-wall buildings

Based on the analysis of a spatial elastic-plastic static pushover and time-history procedure PUSH and EPDA,two frame-wall structures were studied with the pushover and time-history analysis methods.The ductility factor responses of frame structures were calculated for different number of walls and base shear coefficient of frames.The results show that,for relatively small base shear coefficient of frames,shear failure of the walls resulted in large elastic-plastic displacement responses of the frames and even in failure of the structure in a strong seismic motion.An increase in the number of walls sometimes worsened the response of frame-wall buildings.For relatively large base shear coefficient of frames,however,the response displacements decreased gradually as the numbers of wall increased.After analyzing the results of the calculation,some valuable suggestions were concluded and could be used as a reference to designers.