CFRP约束空心薄壁墩抗震性能试验  

Experimental research on seismic behavior of hollow rectangular thin-walled pier confined with CFRP

作　　者：崔海琴[1] 贺拴海[1] 赵小星[1] 可路[2] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064 [2]同济大学土木工程学院,上海200092

出　　处：《长安大学学报（自然科学版）》2010年第3期53-59,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50908017)

摘　　要：为了研究外贴碳纤维增强聚合物（CFRP）加固空心薄壁墩柱的抗震特性,对7根柱进行了低周反复加载试验,其中2根柱为对比柱,另外5根柱采用CFRP环向缠绕加固。试验研究了CFRP加固率、配箍率对墩柱抗震性能的影响。结果表明：所有试件均具有很好的延性抗震性能,延性系数为3.81~5.85;CFRP具有与箍筋相似的力学性能,可以有效地改善空心薄壁墩柱的抗震性能,延性和耗能能力提高显著,但承载力提高有限;随着CFRP层数的增加,延性系数相应地增大,粘贴2层CFRP布的低配箍率墩可以达到高配箍率裸墩的位移延性系数;CFRP布最佳加固率与结构设计参数有关。For researching seismic performance of hollow thin-walled piers confined with CFRP,sever models of such piers were tested under a low cyclically reversed horizontal load,in which five models were wrapped with CFRP.The effects of reinforcement ratio of CFRP and stirrup ratio on the ultimate strength and ductility of the specimens were analyzed and discussed.The results show that： the specimens have well ductility because of ductility factors between 3.81 and 5.85 as well as flexure failure.CFRP,which have the same mechanical properties as stirrups,can effectively improve the seismic performance of hollow thin-walled pier except ultimate bearing capacity,including ductility and energy dissipation capacity.With the increase of layers of CFRP,the ductility can be effectively improved.Piers confined with two-layers CFRP have the same ductility as those with high stirrup rates.The optimal reinforcement rate of CFRP relates to structural design parameters.5 tabs,7 figs,16 refs.

关 键 词：桥梁工程 空心薄壁墩 延性 抗震性能 CFRP 约束 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TU317[交通运输工程—道路与铁道工程]