RC框架“强柱弱梁”设计的可靠度分析

英文篇名：Reliability Analysis of "Strong Column-Weak Beam" Design of RC Frame
中文刊名：昆明理工大学学报(理工版)
英文刊名：Journal of Kunming University of Science and Technology(Science and Technology)
作者：张海燕
英文作者：ZHANG Hai-yan1 ; 2(1.School of Architecture ; South China University of Technology ; Guangzhou 510640 ; China ; 2.State Key Laboratory of Subtropical Architecture Science ; South China University of Technology ; Guangzhou 510640 ; China)
中文关键词：RC框架 ; 强柱弱梁 ; 可靠度 ; 抗震设计
英文关键词：RC frame ; strong column-weak beam ; reliability ; seismic design
出版日期：2009-04-15
机构：华南理工大学建筑学院;华南理工大学亚热带建筑科学国家重点实验室;
年：2009
期：02
出版单位：昆明理工大学学报(理工版)

摘要

"强柱弱梁"从概率意义上讲,就是对同一节点,柱出现塑性铰的概率要远小于梁出现塑性铰的概率;从结构体系来看,结构出现"层间破坏机构"的概率要远小于"整体破坏机构"的概率.本文分别从构件层次和结构体系层次出发,对不同抗震等级的RC框架柱和梁的抗震可靠度进行了分析,然后对一个5层框架结构形成"整体破坏机构"和"层间破坏机构"的概率进行了计算.结果表明,按现行抗震规范设计的抗震等级较低的结构,柱和梁的可靠指标相差不大,结构形成"层间破坏机构"与"整体破坏机构"的概率也相差不大,柱弯矩增大系数有待提高.
"Strong column-weak beam" means that the generation probability of column hinge is far less than that of beam hinge for the same node,and the generation probability of "inter-story failure" mode is far less than that of "whole failure" mode.As viewed from the components and structural system,the reliability of columns and beams for different seismic-resistant grades is analyzed,and the generation probability of "inter-story failure" mode and "whole failure" mode is computed.The results show that for the lower seismic-resistant grade RC frame designed by the current seismic design code,the reliability index of columns is close to that of beams,and the generation probability of "inter-story failure" mode and "whole failure" mode is similar too.The moment magnified factor of columns should be further improved.

引文

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