Y形偏心支撑钢框架的地震反应折减系数和超强系数  

RESPONSE MODIFICATION FACTOR R AND OVERSTRENGTH FACTOR OF Y-ECCENTRIC BRACED STEEL FRAME

作　　者：杨文侠[1] 顾强[2] 宋振森[1] 李东[3] 方有珍[2] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]苏州科技学院江苏省结构重点实验室,苏州科技学院土木工程学院,苏州215011 [3]河海大学土木工程学院,南京210089

出　　处：《工程力学》2012年第10期129-136,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50578099)

摘　　要：该文采用静力推覆和能力谱方法分析了基于我国抗震规范设计的12个Y形偏心支撑钢框架的地震反应折减系数R和超强系数及赘余度超强系数3,分析了结构层数、楼层高跨比对各系数的影响。研究结果表明:Y形偏心支撑钢框架的设计地震作用可在我国现行抗震规范的基础上降低20%左右。Twelve Y-eccentric braced steel frames were designed to complie with Chinese seismic code. The response modification factor R, overstrength factor and redundancy factor of each building were evaluated by the capacity spectrum method combined with the global capacity envelops obtained from an improved pushover analysis. Moreover, the effects of storey numbers and spans of the structure on these factors were analyzed. The results show that the 20% elastic design earthquake action of Y-eccentric braced steel frames can be approximately reduced on the base of Chinese seismic code.

关 键 词：地震反应折减系数 超强系数 Y形偏心支撑钢框架 PUSHOVER分析 能力谱法 

分 类 号：TU391[建筑科学—结构工程]