UHPC-钢筋错位连接的预制剪力墙带板结构抗震性能试验研究  

Aseismic performance tests of precast shear wall-slab structure with UHPC-reinforcement dislocation connection

作　　者：李新星 周泉 李水生 LI Xinxing;ZHOU Quan;LI Shuisheng(China Construction 5th Engineering Bureau Co.,Ltd.,Changsha 410001,China;Hunan Green Municipal Engineering Research Center Co.,Ltd.,China Construction 5th Bureau,Changsha 410001,China)

机构地区：[1]中国建筑第五工程局有限公司,长沙410001 [2]湖南中建五局绿色市政工程研究中心有限公司,长沙410001

出　　处：《振动与冲击》2023年第1期273-281,共9页Journal of Vibration and Shock

基　　金：湖南省自然科学基金(2019JJ40331,2020JJ4652);湖湘青年英才项目(2018RS3113);中建股份科技研发项目(CSCEC-2020-Z-4)。

摘　　要：提出一种UHPC-钢筋错位连接的预制剪力墙节点连接形式,为研究该节点平面外的抗震性能,设计完成了5片剪力墙带板结构平面外拟静力试验,包括3片UHPC-钢筋错位连接预制剪力墙,1片UHPC-钢筋非连续对接连接剪力墙和1片60 d钢筋绑扎搭接的现浇剪力墙结构。对比分析了各试件的破坏形态、滞回曲线、承载力、刚度退化和水平接缝处竖向钢筋的传力性能。结果表明:错位连接剪力墙试件与现浇剪力墙试件破坏形式相同,均为平面外弯曲破坏,与现浇剪力墙相比,错位连接剪力墙极限承载力提高了5.1%,层间位移角均在1/80~1/50;初试刚度高于现浇试件,后期刚度退化、延性和耗能与现浇试件相当;增大UHPC后浇段高度可提高结构的整体刚度,但结构抗震性能降低;后浇段边缘处竖向钢筋在接缝处混凝土开裂后应力达到屈服,UHPC后浇段内钢筋应力较小,节点表现出良好的传力性能,可按照“等同现浇”剪力墙结构设计。Here,a node connection form of precast shear wall with UHPC-reinforcement dislocation connection was proposed.To study out of plane aseismic performance of this node,out of plane quasi-static tests of 5 shear wall slab structures were designed and completed including 3 UHPC-reinforcement dislocation connection precast shear walls,1 UHPC-reinforcement discontinuous butt connection shear wall and 1 cast-in-situ shear wall structure with one piece of 60d reinforcement bound and overlapped.Failure mode,hysteretic curve,load-bearing capacity,stiffness degradation and force transmission performance of vertical reinforcement at horizontal joints of various specimens were analyzed contrastively.The results showed that the failure mode of shear wall specimen with dislocation connection is the same as that of cast-in-situ shear wall specimen,both of them are out of plane bending failure,compared with cast-in-situ shear wall specimen,the ultimate load-bearing capacity of shear wall with dislocation connection increases by 5.1%,and its interlayer displacement angle is between 1/80-1/50;initial test stiffness of shear wall specimen with dislocation connection is higher than that of cast-in-situ specimen,its stiffness degradation,ductility and energy consumption are equivalent to those of cast-in-situ specimen;increasing height of UHPC post cast section can improve the overall stiffness of structure,but aseismic performance of structure drops;stress of vertical reinforcement at edge of post cast section reaches yield after concrete cracks at horizontal joints;stress of reinforcement inside UHPC post cast section is smaller,and joints have good force transmission performance,they can be designed according to the“equivalent cast-in-situ”shear wall structure.

关 键 词：预制剪力墙 UHPC 平面外 钢筋错位连接 低周反复加载试验 抗震性能 

分 类 号：TH375[机械工程—机械制造及自动化] TH371.1