含少量抗震墙的RC框架结构位移限值探讨

摘要

基于位移的抗震设计是实现基于性能的抗震设计的最有效途径,我国规范对不同结构、不同抗震等级的建筑提出了相应的位移限值.但是随着人们对建筑功能的要求提高,含少量抗震墙的框架结构越来越多,此类结构的层间位移控制限值问题一直困扰着结构工程师.文中以实际工程计算为例,探讨了如何分类含少量抗震墙的框架结构,建议此类结构在多遇地震作用下,可以允许抗震墙出现一定的开裂,其抗侧刚度出现一定退化.结合ABAQUS有限元分析软件得到的剪力墙刚度退化规律,利用ETABS有限元分析软件对少墙框架结构进行整体分析,提出了此类结构的层间位移角的控制方法.%Displacement-based seismic design is one of effective performance-based seismic design methods. Design codes specify the displacement limits for various structures in China. For different functional requirements , there are more and more RC frame buildings with few shear walls. How to control the seismic displacement of this type of structures becomes a problem for structural engineers. A new method is proposed to classify frame structures with few shear walls. The shear walls in these structures are allowed to crack under frequently-occurred earthquakes, and therefore, existing stiffness degradation. Based on the ABAQUS and ETABS finite element analyses, the limit for inter-story displacement of frame structures with few shear walls was summarized.