防震缝设置对L形平面不规则RC框架抗震性能的影响
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（长沙理工大学土木与建筑学院， 长沙 410004)
［摘要］基于算例分析讨论设置防震缝对L形平面不规则RC框架抗震性能的影响，所选算例主要考虑楼层数和平面凹进尺寸占相应投影向总尺寸的比例的不同。选用8条地震波，采用MIDAS/Building软件对40个算例结构分别进行7度多遇地震和罕遇地震下的时程分析。结果表明，多遇地震下，设置防震缝会增大结构最大层间位移角；罕遇地震下，设置防震缝后，大多数情况下结构的最大层间位移角增大。设置防震缝后，结构如果刚度对称，扭转效应大幅减小，若刚度不对称，则不对称部分的最大层间扭转角将会大于原结构；同时设置防震缝会小幅增加结构的钢筋用量，主要原因是设置防震缝所导致梁柱数量增多。［关键词］防震缝; 平面不规则框架; 层间位移角; 层间扭转角中图分类号：TU375.4 文献标识码：A 文章编号：1002-848X(2015)22-0029-05
Effect of setting seismic joints on seismic behavior of L-shaped irregular plane RC framesLiu Zhefeng, Zhang Jie, Hu Shi, He Wanlu(School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410004, China)Abstract: The effect of setting seismic joints on seismic behavior of L-shaped irregular plane RC frames was discussed based on numerical examples which include frames with different stories and different proportion of recessed planar dimension to the overall dimension in the relevant projection direction. By using MIDAS/Building software, time-history analyses were carried out on 40 RC frames under frequent and rare earthquakes of 7 degree respectively. The analysis shows that setting seismic joints increases the maximum drift angle under frequent earthquake and increases the maximum drift angle under rare earthquake at the most time. If the structure stiffness is symmetric after setting seismic joints, torsion effect is greatly reduced. If the structure stiffness is asymmetric after setting seismic joints, the maximum inter-story torsion angle of the asymmetric part is larger than the original structure. Setting seismic joints slightly increases steel consumption, because of the increase in the number of beams and columns due to setting seismic joints.Keywords: seismic joint; irregular plane frame; inter-story drift angle; inter-story torsion angle
作者简介：刘哲锋，副教授，博士，Email：Lzf0072006@163.com。
