UHPC连接预制节段桥墩抗震性能拟静力试验研究  

Quasi-Static Experimental Study on Seismic Behavior of UHPC Connecting Prefabricated Segmental Piers

作　　者：巩茂康 米家禾 亓兴军 王宁宁 杨宇 GONG Maokang;MI Jiahe;QI Xingjun;WANG Ningning;YANG Yu(Jinan Kingyue Highway Engineering Co.,Ltd.,Jinan 250220,China;School of Transportation Engineering Shandong Jianzhu University,Jinan 250101,China;Hunan Zhonglu Huacheng Bridge Technology Co.,Ltd.,Xiangtan 411100,China)

机构地区：[1]济南金曰公路工程有限公司,济南250220 [2]山东建筑大学交通工程学院,济南250101 [3]湖南中路华程桥梁科技股份有限公司,湘潭411100

出　　处：《结构工程师》2023年第5期148-156,F0004,共10页Structural Engineers

基　　金：山东省交通运输厅科技计划项目(2022B06);山东省企业技术创新项目(202250101726、202160101415)。

摘　　要：为提高桥墩建造速度和墩柱损伤容限、优化预制节段拼装桥墩的力学性能,提出一种使用超高性能混凝土(UHPC)灌浆料的预制节段连接方式。设计整体现浇试件和UHPC连接预制节段试件开展拟静力试验,对比分析节点的破坏机理以及桥墩的拟静力指标,研究UHPC连接预制节段桥墩抗震性能。结果表明:两试件破坏形态均为弯曲变形为主的延性破坏,但损伤过程差异较大。UHPC在预制节段连接中充分发挥力学性能优势,增强墩柱局部刚度,塑性铰移至下节段UHPC上部接缝附近,在往复荷载作用下墩底接缝持续张开闭合参与耗能,破坏时仅在墩底柱角和接缝处出现少量UHPC剥落现象;装配式试件滞回曲线较饱满,其最大承载力和初始刚度与整体式试件基本一致,二者屈服荷载和极限荷载差值均不超过6%,而屈服位移和极限位移差值分别达到14.49%、17.80%,装配式试件延性系数远大于整体式试件;相比于整体式试件,装配式试件具有更好的刚度保持能力,并且加载后残余变形更小,说明采用UHPC进行节段连接可以有效约束和保护核心混凝土及纵筋,增大桥墩损伤容限;装配式试件耗能能力存在不足,在偏移率为4.65%时仅为整体式试件耗能的73.28%。To improve the speed of pier construction and pier damage tolerance,optimize the mechanical properties of precast segmental assembled piers,a precast segmental connection method using ultra-high performance concrete(UHPC)grout is proposed.The design of monolithic cast-in-place specimens and UHPCconnected precast segmental specimens were carried out for the proposed static force test,and the damage mechanism of nodes and the proposed static force index of piers were compared and analyzed to study the seismic performance of UHPC-connected precast segmental piers.The results show that the damage form of both specimens is bending deformation-based ductile damage,but the damage process is different.In the prefabricated section connection,UHPC gives full play to the mechanical properties of the advantages of enhancing the local stiffness of the pier,and plastic hinge moved to the lower section of the UHPC near the upper joints.Under the reciprocal load,the pier bottom joints continue to open and close to participate in energy dissipation,and only a small amount of UHPC spalling phenomenon occurs in the pier bottom column corner and joints when damaged.The hysteresis curve of the assembled specimen is fuller,its maximum bearing capacity and initial stiffness are basically the same as that of the integral specimen.The difference between yield load and ultimate load does not exceed 6%,while the difference between yield displacement and ultimate displacement reaches 14.49%and 17.80%respectively,and the ductility coefficient of the assembled specimen is much larger than that of the integral specimen.Compared with the integral specimen,the assembled specimen has better stiffness retention ability,and the residual deformation after loading is smaller.Compared with the monolithic specimen,the assembled specimen has better stiffness retention ability and smaller residual deformation after loading,which indicates that the segmental connection by UHPC can effectively restrain and protect the core concrete and longitudinal reinfor

关 键 词：超高性能混凝土 预制节段拼装桥墩 拟静力试验 抗震性能 数值模拟 

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]