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UHPC墩周连接装配式桥墩拟静力试验 被引量:2

Pseudo static test of UHPC prefabricated pier with energy dissipation connection around pier
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摘要 为减轻装配式桥墩在地震灾害中的损伤、优化装配式桥墩力学性能,本文提出一种采用超高性能混凝土(UHPC)连接的新型装配式桥墩连接方式:UHPC墩周连接。为了研究该新型装配式桥墩的抗震性能,本次研究设计并制作1个现浇桥墩试件和1个UHPC墩周连接装配式桥墩试件,对2个试件进行拟静力试验。对比2个试件在水平往复循环荷载作用下的破坏模式、滞回曲线、骨架曲线、耗能、侧向刚度、残余位移和延性作对比分析,并分析试验中装配式试件钢筋应变、墩身曲率。实验结果表明:UHPC墩周连接装配式桥墩与整体现浇桥墩都是弯曲变形为主的延性破坏,装配式桥墩试件未发生塑性铰区域混凝土大面积压溃、剥落的现象,其破坏形态主要是UHPC与普通混凝土接缝的张开闭合和塑性铰区混凝土的弯曲变形;装配式桥墩的刚度自复位能力较整体现浇式桥墩均得到不同程度优化,延性更是高出现浇桥墩46.8%,但耗能性能略差;结合墩柱曲率和不同位置钢筋应变,UHPC墩周连接试件薄弱位置位于立柱底部与承台拼接缝处,UHPC连接段内的搭接钢筋是往复加载过程中耗能的主要部件。因此,UHPC墩周连接装配式桥墩具有良好的抗震性能和使用价值,可为实际工程提供参考。 To reduce the damage of prefabricated piers in earthquake disasters and optimize the mechanical properties of prefabricated piers,this paper proposes a new connection method of prefabricated piers using ultra-high performance concrete(UHPC)connection:UHPC pier peripheral connection.In order to study the seismic performance of the new prefabricated pier,a cast-in-place pier specimen and a UHPC pier peripherally connected prefabricated pier specimen are designed and fabricated in this study,and quasi-static tests are performed on the two specimens.The failure mode,hysteresis curve,skeleton curve,energy dissipation,lateral stiffness,residual displacement and ductility of the two specimens under the action of horizontal reciprocating cyclic loading are compared for comparative analysis,and the steel bar strain,pier and pier of the fabricated specimen are analyzed in the test.body curvature.The experimental results show that:UHPC pier peripherally connected prefabricated piers and integral cast-in-place piers are both ductile failures mainly due to bending deformation.The prefabricated pier specimens do not suffer from large-scale concrete crushing and spalling in the plastic hinge area,and their failure modes are mainly the opening and closing of the joint between UHPC and ordinary concrete and the bending deformation of the concrete in the plastic hinge area;the stiffness self-resetting ability of the fabricated bridge pier is optimized to different degrees compared with the overall cast-in-place bridge pier,and the ductility is even higher than that of the cast bridge pier,but the energy dissipation performance is slightly worse;combining the curvature of the pier column and the strain of steel bars at different positions,the weak position of the UHPC pier peripheral connection specimen is located at the joint between the bottom of the column and the cap,and the lapped steel bars in the UHPC connection section are the main components of energy consumption during the reciprocating loading process.Therefore,the UHPC
作者 辛崇升 赵奇 米家禾 亓兴军 杨宇 管青海 Xin Chong-sheng;Zhao Qi;Mi Jia-he;Qi Xing-jun;Yang Yu;Guan Qing-hai(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)
出处 《工程抗震与加固改造》 北大核心 2023年第4期83-92,共10页 Earthquake Resistant Engineering and Retrofitting
基金 山东省交通运输厅科技计划项目(2020B06) 山东省高等学校土木结构防灾减灾协同创新中心项目(XTM201904) 山东省自然科学基金面上项目(ZR2021ME104) 山东省企业技术创新项目(202250101726:202160101415)。
关键词 装配式桥墩 连接方式 UHPC 拟静力试验 prefabricated pier connection method UHPC quasi-static test
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