摘要
以OpenSees为分析平台,建立一个9层钢框架结构Benchmark模型的有限元模型,并设计两种屈曲支撑布置方案。通过静力Pushover分析和时程分析,得到防屈曲支撑与钢框架结构的合理刚度匹配原则,分析防屈曲的最优布置方式和布置原则。通过防屈曲支撑钢框架与纯钢框架结构的整体超强系数RS与整体延性折减系数Ru的对比,研究防屈曲支撑提高钢框架结构整体稳定性能和抗地震侧向倒塌能力的作用。基于增量动力分析,比较钢框架与防屈曲支撑钢框架的倒塌中位值,分析防屈曲支撑提高钢框架结构抗震承载能力和塑性变形能力(整体延性)的作用以及合理的防屈曲支撑布置方式。
Based on the OpenSees platform,the finite element model of nine-storey benchmark steel frame building was setup,and two configuration layouts of buckling-restrained braces( BRBs) in this benchmark steel frame were designed.Based on pushover analysis( POA) and time-history analysis( THA),the rational stiffness ratio of BRBs with steel frame and optimal arrangement of BRBs in steel frames were researched. The mechanical properties of bucklingrestrained braced steel frame were researched. The over-strength factor and ductility reduction coefficient of steel frames and buckling-restrained braced steel frame were compared. After installed with BRBs,the overall stability of structures and seismic collapse capacity were improved. Based on incremental dynamics analysis( IDA),the collapse medians of steel frame and buckling-restrained braced frame( BRBF) were compared,the contribution of BRBs for improvement of seismic bearing capacity and global ductility of steel frame were researched,and reasonable arrangement of BRBs in steel frames was analyzed.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第S1期7-12,共6页
China Civil Engineering Journal
基金
国家自然科学基金(50978080
51008090
51178150)
高等学校博士学科点专项科研基金(20102302120077)
哈工大科研创新基金(HIT.NSRIF.2009)
黑龙江省博士后科研启动金(LBH-Q11123)
北京市市属市管高校重点实验室课题
关键词
防屈曲支撑
钢框架
刚度比
整体超强系数
抗地震侧向倒塌能力
buckling-restrained braces
steel frame
stiffness ratio
global ductility
seismic lateral collapse capacity
