防屈曲支撑稳定及延性性能分析  

Stability behavior and ductility performance analysis of buckling-restrained braces

作　　者：贾明明[1] 张素梅[1] 吕大刚[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2010年第S2期76-81,共6页Journal of Building Structures

基　　金：国家十一五技术支撑项目子课题(2006BAJ01B02-02-03);黑龙江省自然科学基金重点项目(ZJG0701);中国博士后科学基金项目(20080440891);哈尔滨工业大学科研创新基金项目(HIT.NSRIF.2009)

摘　　要：防屈曲支撑的稳定及延性性能是衡量其抗震性能的重要参数,对防屈曲支撑的稳定及延性性能及进行了系统研究。分析了防屈曲支撑的整体稳定性能,并基于ANSYS研究了外包单元为钢管混凝土时约束系数对防屈曲支撑整体稳定性能和延性性能的影响;分析了内核单元高模态屈曲产生的原因及由其导致的防屈曲支撑受力过程中性能的改变,以及支撑内核单元与外包钢管混凝土之间的间隙大小对防屈曲支撑高模态稳定性能的影响。通过上述分析给出了防屈曲支撑约束系数的限值为2.5,并认为内核单元与外包单元之间间隙的大小在内核单元厚度的1/20～1/10之间较为合理。通过4个试件的试验研究验证了有限元分析的结果。Stability behavior and ductility performance are important seismic performance parameters of buckling-restrained brace(BRB).Using ANSYS,we analyzed the global stability performance of BRB and its ductility performance which are influenced by the restriction coefficient.The mechanical performance is changed as a result of buckling of the inner core in higher modes,and then the reason for higher modes buckling of BRB is researched.The influence of the clearance between inner concrete core and steel tube is analyzed.The above analysis suggests the limit value of the restriction coefficient of BRB be 2.5,and the clearance between inner core and outer element be 1/20～1/10 of inner core′s width.These results are verified with the experimental results of four BRB components.

关 键 词：防屈曲支撑 有限元分析 稳定性能 延性 

分 类 号：TU311.3[建筑科学—结构工程]