基于整体刚度折减系数的网壳结构抗震性能参数  

Seismic performance parameter of latticed shell based on overall stiffness reduction factor

作　　者：罗永峰[1] 毋凯冬 相阳[1] Luo Yongfeng;Wu Kaidong;Xiang Yang(College of Civil Engineering, Tongji University, Shanghai 200092 ,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《东南大学学报（自然科学版）》2017年第3期539-544,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51378379)

摘　　要：为研究针对网壳结构抗震性能的参数指标及设计限值,实现网壳结构抗震性能的快速评估与校核,采用基于结构整体刚度参数的模态推覆分析法,将网壳结构简化为相应的等效单自由度体系,分析网壳结构地震反应.基于此结构整体刚度参数及等效单自由度体系,提出新的抗震性能参数——整体刚度折减系数,并验证其准确性.将整体刚度折减系数值0.10,0.75和1.00作为矢跨比大于等于1/4的K6型网壳结构轻微破坏、中等破坏、严重破坏和倒塌的界限值,并将整体刚度折减系数值0.10和0.80分别作为结构线弹性、弹塑性变形验算的设计限值.数值算例分析结果表明,整体刚度折减系数具有较好的适用性,可用于网壳结构抗震性能的快速评估与校核以及结构设计优化.To study the seismic performance parameters,index and limit values for the latticed shells to realize fast evaluation and check of the seismic performance,the latticed shell is simplified to the equivalent single degree of freedom(ESDOF)system by using the modal pushover analysis method based on the overall structural stiffness parameters,and the seismic responses of this structure is also analyzed.Based on the overall structural stiffness parameters and the ESDOF system,a new seismic performance parameter,overall stiffness reduction factor(OSRF),is introduced,and its accuracy is proved.The OSRFs of0.10,0.75,1.00are set as the boundary values for slight damage,moderate damage,severe damage and collapse of K6lattice shells with the ratio of rise to span of1/4or greater,respectively.The OSRFs of0.10and0.80are set as the design limit values at the linear-elastic and elastic-plastic stages,respectively.The analysis results of the numerical examples show that the ORSF has good applicability and can be used for fast evaluation and check for the seismic performance of latticed shells as well as structural design and optimization

关 键 词：网壳结构 整体刚度折减系数 抗震性能参数 设计优化 

分 类 号：TU973.31[建筑科学—结构工程]