耗能减震支撑体系研究及其在世博中心工程中的应用  

Study and application of seismic energy dissipation bracing system in Expo Center

作　　者：汪大绥[1] 陈建兴[1] 包联进[1] 孙飞飞[2] 周建龙[1] 李国强[2] 姜文伟[1] 黄永强[1] 

机构地区：[1]华东建筑设计研究院有限公司,上海200002 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑结构学报》2010年第5期117-123,共7页Journal of Building Structures

基　　金：上海市科技人才计划项目:超高层建筑结构设计关键技术研究(08XD14223)

摘　　要：结合世博中心工程,对防屈曲耗能支撑(BRB)体系的设计关键问题进行研究,包括结构抗震性能目标、BRB布置、BRB的节点设计、BRB产品验收标准等。对世博中心工程中采用的BRB进行足尺试验,试验结果表明:BRB具有较好的滞回性能,满足产品验收标准。BRB的承载力因应变强化和受压而提高,而且不同厂家的产品性能有一定差别,制订统一的产品验收标准是必要的。对耗能减震支撑结构进行静力弹塑性分析和弹塑性动力时程分析,追踪地震作用下结构的受力和变形发展过程,验证中震和大震作用下结构的抗震性能,满足结构抗震性能目标的要求。两种弹塑性分析结果均表明,合理布置BRB,在罕遇地震作用下可使BRB同步屈曲,整体结构具有较好的抗震性能。Buckling restrained brace frame（BRBF） is a system with prominent seismic energy dissipation.In this paper,analysis was conducted to study the main design principles for BRBF including structural seismic performance,layout of BRB,design of BRB and joints,criteria of BRB products.Low cycle loading tests of full scale BRB were performed to illustrate that the hysterics behavior for BRB used at the Shanghai Expo Center is good enough to satisfy the product criteria.Test results also show that BRB capacity increases because of the strain harden and compression.It is found that BRB produced by different companies may show different behaviors,and a uniform criterion is necessary in the application.Pushover analysis and elasto-plastic time history analysis are carried out to obtain the plastic deformation and structural forces under earthquake.Both analytical results indicate that with reasonable layout and design,BRB can dissipate energy and result in the whole structure with good seismic behavior.

关 键 词：防屈曲耗能支撑 低周反复荷载试验 PUSHOVER分析 弹塑性时程分析 抗震性能 

分 类 号：TU393.3[建筑科学—结构工程] TU352.12