UHPC墩周连接装配式桥墩抗震性能研究  

Seismic performance of assembled piers connected withultra-high-performance concrete around the pier

作　　者：王宁宁 赵奇 米家禾 亓兴军 杨宇 WANG Ningning;ZHAO Qi;MI Jiahe;QI Xingjun;YANG Yu(Ji'nan Kingyue Highway Engineering Company Limited,Ji'nan 250220,Shandong,China;School of Transportation Engineering,Shandong Jianzhu University,Ji'nan 250101,Shandong,China;Hunan Zhonglu Huacheng Bridge Technology Co.,Ltd.,Xiangtan 411100,Hunan,China)

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

出　　处：《地震工程学报》2023年第4期780-791,共12页China Earthquake Engineering Journal

基　　金：山东省交通运输厅科技计划项目(2020B69,2022B06);山东省企业技术创新项目(202250101726)。

摘　　要：为改善预制装配式桥墩的抗震性能和施工容错能力,提出一种装配式桥墩新型连接方式:超高性能混凝土(Ultra-High-Performance Concrete, UHPC)墩周连接。设计并制作1个现浇桥墩试件和1个UHPC墩周连接装配式桥墩试件,对两个试件进行拟静力试验;建立UHPC墩周连接装配式桥墩试件的三维实体非线性有限元模型,对比研究新型装配式桥墩的抗震性能及其影响因素。结果表明:UHPC墩周连接装配式桥墩与整体现浇桥墩表现出相似的抗侧力性能和自复位能力,二者的抗震性能基本等同。对比分析非线性有限元模型与实际桥墩试件的滞回曲线,二者拟合程度较高,验证了建模方法的可靠性和模拟结果的准确性。UHPC连接段高度对该装配式桥墩抗震性能的影响不大,保证钢筋搭接长度即可。轴压比、立柱高度和搭接钢筋配筋率对该装配式桥墩抗震性能的影响较为明显:在轴压比为0.1~0.3时,试件刚度和水平承载力随轴压比的增大而增大,残余位移随轴压比的增大而减小;立柱高度由2.0 m提高至2.5 m时,高度越大该装配式桥墩的水平承载能力和累积滞回耗能越小;湿接缝处搭接钢筋配筋率由1.01%增至1.57%时,该装配式桥墩的水平承载能力和残余位移相比原配筋试件性能有较明显的提升。To improve the seismic performance and construction fault tolerance of prefabricated assembled piers,this paper proposes a new connection method for assembled piers:assembled piers connected with ultra-high-performance concrete(UHPC)around piers.A cast-in-place bridge pier specimen and an assembled pier specimen connected with UHPC around the pier were designed and fabricated.A quasi-static test was performed on two specimens,and a three-dimensional solid nonlinear finite element model of the assembled pier specimen was established.The seismic performance and associated influencing factors of the proposed assembled pier were analyzed by performing a numerical simulation.The results showed that the assembled pier specimen connected with UHPC around the pier exhibited a similar lateral performance and self-resetting capability as the integral cast-in-place pier,and their seismic performances were the same.The fitting degree between the hysteretic curves of the nonlinear finite element model and the actual pier specimen was high,verifying the reliability of the modeling method and the accuracy of the simulation results.The height of the UHPC connection had little influence on the seismic performance of the assembled pier,and only the lap length of the reinforcement needed to be ensured.The axial compression ratio,column height,and lapped reinforcement ratio had evident effects on the seismic performance of the assembled bridge pier.When the axial compression ratio was between 0.1 and 0.3,the stiffness and horizontal bearing capacity of the specimen increased with the increase in the axial compression ratio.When the column height increased from 2.0 m to 2.5 m,the horizontal bearing capacity and accumulated hysteretic energy dissipation of the assembled pier decreased with the increase in the column height;when the reinforcement ratio was increased from 1.01%to 1.57%,the horizontal bearing capacity and residual displacement of the assembled pier were evidently improved compared with those of the original specimen.

关 键 词：UHPC墩周连接装配式桥墩 抗震性能 拟静力试验 非线性有限元模型 数值模拟 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]