（中国电子工程设计院， 北京 100142）

［摘要］以北京市某社区服务中心为例，进行凹字形平面框架的抗震性能分析。采用振型分解反应谱法进行多遇地震下的计算分析，而后利用弹塑性时程分析方法补充进行罕遇地震下的计算分析。然后为了研究凹字形平面不规则性，建立了平面更为规则的回字形结构作为对比模型，分析其平面不规则对框架整体性的影响。经分析表明，本工程框架结构在多遇地震下能够满足规范对于刚度以及承载力的要求。并且在罕遇地震作用下，弹塑性变形也均小于规范要求的限值。最后通过与回字形平面的框架模型进行比对分析可知，两种平面类型的结构在小震下的整体性能指标相差不大。本工程的抗震性能分析结论可以作为与本工程类似的凹凸不规则框架结构的参考。

［关键词］凹字形平面； 框架结构； 振型分解反应谱法； 弹塑性时程分析； 回字形平面对比分析

中图分类号： TU375, TU318 文献标识码： A文章编号：  1002-848X(2016)S1-0325-04

Seismic performance of concave shaped frame structure

Wang Yu, Zhong Xubo

(China Electronics Engineering Design Institute, Beijing 100142, China)

Abstract： Taking a community service center in Beijing as an example, the seismic performance of the frame with the concave shaped surface was analyzed. The calculation of the multi event earthquake using the mode decomposition response spectrum method was carried out, then the analysis of the rare earthquake was made by using the elastic-plastic time history analysis method. Then in order to study the irregularity of the concave shaped plane, a more regular structure of the homocentric plane was established as a comparison model.The analysis results show that the framework of the project can meet the requirements of the standard for the stiffness and the bearing capacity in the case of the frequently occurred earthquake. In the case of rare earthquake, the elastic plastic deformation can also satisfy the regulations of the national standard. Finally, compared with the frame model of the homocentric-shaped plane, the both have just little difference in the overall performance under the frequently occurred earthquakes. The seismic performance analysis of this project can be used as reference for the same kind of irregular buildings.

Keywords: concave shaped plane; frame structure; mode-superposition response spectrum method; elastic-plastic time history analysis method; comparison and analysis of the homocentric plane

作者简介： 王雨，硕士，助理工程师，Email:wangyu7@ceedi.cn。