防屈曲支撑巨型结构抗超大震性能分析与设计  

Seismic Performance Analysis and Design of a Mega Structure with Buckling Restraining Braces under Super-strong Earthquake

作　　者：康谨之 王建[2] 欧进萍[1,2] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024 [2]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《防灾减灾工程学报》2015年第6期814-821,838,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51261120376;91315301-12);国家科技支撑计划项目(2011BAK02B01)资助

摘　　要：为研究防屈曲支撑对巨型结构的减震控制效果,首先采用SAP2000,按照现行规范8度设防的要求,设计了一座48层巨型框架结构,并将此结构的所有普通支撑分别用与其等刚度和等面积的防屈曲支撑代替,得到等刚度防屈曲支撑巨型结构和等面积防屈曲支撑巨型结构,然后对3个结构进行8度、8.5度和9度罕遇地震作用下的弹塑性时程分析。分析结果表明:在8度罕遇地震作用下,防屈曲支撑巨型结构较巨型结构的最大层间位移角有明显减小,且层间位移角变化更均匀;防屈曲支撑巨型结构能达到"大震可修,超大震不倒"的抗震设防目标,提高了结构的安全储备。To study the vibration control effect of the mega structure with buckling restraining brace（BRB）,a 48-story mega frame structure was designed with SAP2000,under the requirements for Intensity 8fortification against earthquakes.And then,all the braces of the mega structure were replaced by BRBs whose stiffness are equal to common braces or BRBs whose area are equal to common braces,respectively.The two updated structures are referred to as the EKBRB structure or EABRB structure.Finally,elastoplastic time history analysis of the three structures were conducted under Intensities 8,8.5and 9earthquake.The results show that interstory drift ratio of BRB structure is significantly reduced and changes more uniformly under Intensity 8earthquake compared to the mega structure;the BRB structure meets the seismic fortification target that repairable under severe earthquake and no-collapse under super-strong earthquake.Thus it can be seen that the BRB structure provides enough emergency capacity for structures.

关 键 词：巨型结构 防屈曲支撑 抗震性能 弹塑性时程分析 塑性铰 层间位移角 

分 类 号：TU393.2[建筑科学—结构工程]