现行规范剪力墙轴压比限值的研究和探讨  

Research and discussion on limit value of axial compression ratio of shear wall in current code

作　　者：王磊 WANG Lei(Shenzhen Hitrusdesign Co.,Ltd.,Shenzhen 518063,China)

机构地区：[1]深圳市和域城建筑设计有限公司,深圳518063

出　　处：《建筑结构》2022年第23期132-138,共7页Building Structure

摘　　要：现行规范中对剪力墙轴压比的计算仅考虑重力荷载代表值的轴向压力作用,基于此概念的剪力墙轴压比限值规定存在值得商榷之处。通过对一个具体工程案例的研究和分析,提出了对剪力墙截面在罕遇地震作用下,应力计算时考虑压弯共同作用的计算方法,将原来控制墙肢轴压比的思路转变为控制墙肢的应力比。采用了三种地震作用计算方式对嵌固端楼层剪力墙进行罕遇地震作用下的墙肢应力计算,根据约束条件和受力条件的不同,每个墙肢选取三个关键部位进行计算。计算结果表明,考虑压弯共同作用的计算方式能更有针对性地控制剪力墙的应力比,即便按照现行规范方式计算的墙肢轴压比已经超过限值,也能确保其在罕遇地震作用下混凝土不被压溃;采用控制罕遇地震作用下墙肢应力比的方法,能够优化墙肢截面,使其混凝土抗压性能得以充分发挥。In current code,only the axial pressure of the representative value of gravity load is considered in the calculation of axial compression ratio of shear wall.The limit value of axial compression ratio of shear wall based on this concept is questionable.Through the research and analysis of a specific engineering case,a calculation method considering the combined action of compression and bending in the stress calculation of shear wall section under rare earthquake was proposed,which changes the original idea of controlling the axial compression ratio of wall limb into controlling the stress ratio of wall limb.Three seismic action calculation methods were used to calculate the wall limb stress of the shear walls of the embedded end floor under the rare earthquake.According to the different constraint conditions and stress conditions,three key parts of each wall limb were selected for calculation.The calculation results show that the calculation method considering the combined action of compression and bending can more pertinently control the stress ratio of the shear wall,even if the axial compression ratio of wall limb calculated according to the current code has exceeded the limit,it can ensure that the concrete will not be crushed under the rare earthquake.The method of controlling the stress ratio of wall limb under rare earthquake can optimize the section of wall limb and give full play to the compressive performance of concrete.

关 键 词：剪力墙轴压比 罕遇地震 约束条件 应力比 压弯共同作用 

分 类 号：TU318.1[建筑科学—结构工程]