嵌入式钢管混凝土墩柱-盖梁承插节点抗震性能研究  

Study on seismic behavior of embedded concrete filled steel tube(CFST)pier-cap beam socket joints

作　　者：王建飞 王丽锋 王利辉[2] WANG Jianfei;WANG Lifeng;WANG Lihui(CCCC Construction Group Co.Ltd.,Beijing 10022,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中交建筑集团有限公司,北京100022 [2]北京工业大学城市与安全减灾教育部重点实验室,北京100124

出　　处：《世界地震工程》2024年第1期154-163,共10页World Earthquake Engineering

基　　金：国家自然科学基金项目(51978357);高寒地区预制节段拼装桥墩剪切破坏机理及设计方法项目。

摘　　要：预制装配桥梁采用工厂化预制、现场拼装的施工方法,具有施工质量高、建设周期短和环境扰动少等优点。为满足预制装配桥梁下部结构的建造需求,结合了超高性能混凝土(ultra high-performance concrete,UHPC),提出一种新型的嵌入式钢管混凝土(concrete-filled steel tube,CFST)墩柱-盖梁承插连接节点。开展1∶3缩尺的拟静力试验,揭示节点的损伤发展和失效模式,探究承插深度对节点抗震性能的影响规律,并基于ABAQUS建立节点的精细化数值分析模型。研究结果表明:1.2倍CFST直径的承插深度可保证损伤发生在节点区域以外,盖梁保持弹性状态,通过分析滞回曲线、承插能力和耗能能力等抗震性能指标,验证了新型节点良好的抗震性能;基于试验结果验证了节点数值分析模型可以合理精度预测节点的整体地震响应和承载能力。研究工作可为预制装配桥梁下部结构在中高烈度区的工程应用提供参考。The prefabricated bridge adopts the construction method of factory prefabrication and on-site assembly,which has the advantages of high construction quality,short construction period and less environmental disturbance.To meet the construction requirements of the prefabricated bridge substructure,this paper proposes a new type of embedded concrete-filled steel tube(CFST)pier column-cap beam socket connection joint combined with Ultra High-Performance Concrete(UHPC).A quasi-static test with a scale of 1∶3 was carried out to reveal the damage development and failure modes of the joints,to study the influence of the socket depth on the seismic performance of the joints,and to establish a refined numerical analysis model of the joints based on ABAQUS.The research results show that the socket depth of 1.2 times the CFST diameter can ensure that the damage occurs outside the joint area,and the cap beam maintains an elastic state.The good seismic performance of the new joint is verified by analyzing the seismic performance indicators such as hysteretic curve,socket capacity and energy dissipation capacity.Based on the test results,it is verified that the joint numerical analysis model can predict the overall seismic response and capacity of the joints with reasonable accuracy.The research work in this paper can provide a reference for the engineering application of prefabricated bridge substructure in medium and high seismic intensity areas.

关 键 词：预制装配桥梁 承插连接 墩柱-承台节点 拟静力试验 抗震性能 

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