明挖车站装配式钢筋笼分布筋搭接接头力学性能试验研究  

Experimental Study on Mechanical Properties of Lapped Joints for Distributed Reinforcement Bars in Prefabricated Steel Cages Used in Open-Cut Station

作　　者：张建伟 张鹏 王加庆 崔涛 陈剑 邢建军 解廷伟 牛宇哲 ZHANG Jianwei;ZHANG Peng;WANG Jiaqing;CUI Tao;CHEN Jian;XING Jianjun;XIE Tingwei;NIUYuzhe(Qingdao Metro Group Co.,Ltd.,Shandong 266000,Qingdao,China;China Railway Design Co.,Ltd.,Tianjin 300142,China;Shenzhen Metro Construction Group Co.,Ltd.,Shenzhen 518026,Guangdong,China)

机构地区：[1]青岛地铁集团有限公司,山东青岛266000 [2]中国铁路设计集团有限公司,天津300142 [3]深圳地铁建设集团有限公司,广东深圳518026

出　　处：《隧道建设(中英文)》2025年第3期521-531,共11页Tunnel Construction

基　　金：青岛地铁集团有限公司科技开发课题(M15-J2-ZX-2024-022)。

摘　　要：为验证明挖车站主体结构装配式钢筋笼模块纵向分布钢筋U形、V形连接节点力学性能,制作足尺试验模块,通过单点弯剪及双点纯弯室内试验,获得弯矩、应变、裂缝发育等试验结果。系统研究明挖车站装配式钢筋笼分布筋U形与V形搭接接头在纯弯及弯剪耦合工况下的力学性能,并以分布筋通长连接构件为基准开展对比分析。试验重点揭示不同连接方式的裂缝发展规律、材料应变响应及承载特性。结果表明:1)在纯弯工况下,分布筋通长连接构件呈现典型延性特征,其弯矩承载力从开裂阶段(675 kN·m)至极限状态(1224 kN·m)提升81.3%,极限挠度达12.1 mm。V形搭接构件极限承载力为分布筋通长连接的80.2%(982 kN·m),极限挠度达11.94 mm;而U形搭接构件表现为脆性破坏模式,性能增幅仅31.7%(由575 kN·m提升至757 kN·m),破坏前无显著变形。2)在弯剪复合工况下,通长连接构件保持最高极限弯矩(1275 kN·m)与刚度控制能力(挠度7.5 mm);V形搭接构件完成完整变形历程(极限挠度13.17 mm),极限弯矩为通长连接的77.3%;U形搭接构件则因早期开裂(775 kN·m)导致承载力停滞,最终挠度(6.8 mm)仅为通长连接的54.7%。3)综合对比显示,V形搭接在极限承载力(通长连接的82%)、延性系数(通长连接的85%)及破坏可控性方面,较U形搭接具有显著优势,被推荐作为装配式钢筋笼分布筋纵向连接优先方案。Full-scale test modules are prepared to examine the mechanical performance of U-and V-shaped connection nodes of longitudinally distributed reinforcement in prefabricated reinforcement cage modules used in open-cut station structures.Indoor tests on bending-shear and double-point bending provide data on bending moment,strain,and crack development.The mechanical performance of U-and V-shaped lapped joints in prefabricated reinforcement cages of open-cut metro stations under pure bending and combined bending-shear loading conditions is investigated and compared with continuous reinforcement joints as a benchmark.The experimental results reveal the crack propagation patterns,material strain responses,and load-bearing characteristics of the different joint types.Key findings are as follows:(1)Under the pure bending condition,continuous reinforcement joints display ductile behavior,with a bending moment capacity increasing by 81.3%from crack onset(675 kN·m)to the ultimate state(1224 kN·m),accompanied by an ultimate deflection of 12.1 mm.V-shaped lapped joints reach 80.2%(982 kN·m)of the ultimate bending capacity of continuous joints and show a comparable ultimate deflection of 11.94 mm.U-shaped lapped joints exhibit brittle failure behavior,with only a 31.7%strength increase(from 575 to 757 kN·m)and minimal deformation prior to failure.(2)Under the combined bending-shear loading condition,continuous joints maintain the highest ultimate bending moment(1275 kN·m)and stiffness control,with a deflection of 7.5 mm.V-shaped joints complete full deformation cycles,reaching an ultimate deflection of 13.17 mm and 77.3%of the ultimate bending capacity of continuous joints.U-shaped joints experience early cracking at 775 kN·m,followed by strength stagnation,resulting in a final deflection of 6.8 mm,equivalent to 54.7%of the continuous joints′capacity.(3)Comprehensive comparative analysis demonstrates that the V-shaped lapped joints exhibit significant performance advantages over U-shaped joints,achieving 82%of the ultima

关 键 词：明挖地铁车站 装配式钢筋笼 U形分布筋搭接连接 V形分布筋搭接连接 接头力学性能 

分 类 号：U45[建筑科学—桥梁与隧道工程]