无粘结预应力组合耗能钢筋装配式桥墩抗震性能研究  

Research on Seismic Performance of Prefabricated Segmental Piers with Unbonded Tendons and Energy-Dissipating Rebar Connections

作　　者：朱钊[1,2] 李源 贺拴海[1,2] 周敉 ZHU Zhao;LI Yuan;HE Shuan-hai;ZHOU Mi(School of Highway,Chang′an University,Xi′an 710064,China;Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation,Xi′an 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]旧桥检测与加固技术交通行业重点实验室,陕西西安710064

出　　处：《桥梁建设》2022年第6期58-65,共8页Bridge Construction

基　　金：国家自然科学基金面上项目(51978062);中央高校基本科研业务费专项资金——长安大学优秀博士学位论文培育资助项目(300203211218)。

摘　　要：为了解无粘结预应力组合耗能钢筋装配式桥墩的抗震性能,制作1组该类型桥墩试件进行拟静力试验。分析试验破坏模式及滞回特性,并与现浇桥墩试件结果进行对比;采用OpenSees软件进行不同耗能钢筋配筋率时该类型桥墩的抗震性能研究,基于残余位移及平均等效阻尼比给出兼顾耗能及自复位能力的无粘结预应力组合耗能钢筋装配式桥墩配筋率比值合理区间。结果表明:在耗能钢筋配筋率相近时,无粘结预应力组合耗能钢筋装配式桥墩试件与现浇桥墩试件耗能能力相当且残余位移更小;耗能钢筋配筋率增大可有效提升桥墩的耗能能力、水平承载力、等效阻尼比及初始刚度,但将导致较大的残余位移;耗能钢筋与无粘结预应力配筋率比值为1.42~2.72时,该类型桥墩可同时实现较好的耗能能力及优异的自复位性能。To understand the seismic performance of prefabricated segmental piers with unbonded tendons(UT)and energy-dissipating(ED)rebars,fiber-element models and quasi-static cyclic tests are designed performed in this study.After experiments,the failure modes and hysteretic characteristics of the hybrid pier and cast-in-place(CIP)pier are analyzed and compared.And the analysis software OpenSees is utilized to study the seismic performance of the piers under different energy-dissipating rebar ratios.According to the residual drifts and equivalent damping ratios,the adaptable reinforcement ratios are suggested to achieve great energy dissipation as well as self-centering capacities.The analysis indicates that the hybrid pier exhibits emulative energy dissipation and smaller residual deformation versus CIP pier when adopting the similar ED rebar ratios.With the increase of ED rebar ratios,the energy dissipation,horizontal bearing capacity,equivalent damping ratio and initial stiffness are greatly improved.However,larger residual drift is synchronously induced.While the ratio of ED rebars to UTs is defined as 1.42 to 2.72,the pier can achieve not only great energy dissipation but also excellent self-centering capacities.

关 键 词：装配式桥墩 无粘结预应力组合耗能钢筋 滞回特性 耗能能力 配筋率比值 抗震性能 拟静力试验 有限元法 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]