相同造价下几类方形截面桥墩抗震性能对比研究  

Comparative Study on Seismic Performance of Several Types of Square Section Piers at the Same Cost

作　　者：李彪[1] 吕飞 孙浩 丁发兴[1] 蔡勇强 张朝成 Biao Li;Fei Lyu;Hao Sun;Faxing Ding;Yongqiang Cai;Chaocheng Zhang(School of Civil Engineering,Central South University,Changsha 410075,China;Zhejiang Xinrui Construction Engineering Co.,Ltd.,Wenzhou 325000,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]浙江新瑞建设集团有限公司,浙江温州325000

出　　处：《钢结构（中英文）》2024年第1期53-67,共15页Steel Construction（Chinese & English）

基　　金：国家自然科学基金面上项目(51978664,52008400);湖南省自然科学基金项目(2022JJ40609)。

摘　　要：强震下传统钢筋混凝土桥墩抗震性能不足,而钢管混凝土具有更好的抗震性能。钢管混凝土墩在公路、高速公路、城市快速路和高速铁路等领域具有广阔的应用前景,近年来在桥梁结构中逐步推广应用。为提高桥墩的抗震韧性,结合当前各类桥墩抗震研究现状,对方形截面钢筋混凝土墩、部分填充钢管混凝土墩、钢管混凝土墩以及端部拉筋钢管混凝土墩的极限抗震能力进行对比研究,并对钢筋混凝土、部分填充钢管混凝土、钢管混凝土与端部拉筋钢管混凝土墩的足尺有限元模型进行地震弹塑性和塑性大变形时程分析,探讨不同类型桥墩的抗震极限性能及其适用范围。分析中采用有限元软件ABAQUS建立实体–壳精细化有限元模型,模型中混凝土应力–应变关系采用参数确定性的混凝土三轴塑性–损伤模型,并引入裂缝插入技术;钢材应力–应变关系采用混合强化与韧性损伤模型,用已有单向拟静力、单向拟动力、双向拟动力和振动台加载下的钢筋混凝土、部分填充钢管混凝土、钢管混凝土与端部拉筋钢管混凝土桥墩抗震性能试验成果对有限元模型进行验证,最后采用位移响应、累积耗能和刚度损伤三个评价指标对相同造价下各类桥墩在不同地震动强度下的抗震韧性进行评价。分析结果表明:1)上述墩柱实体–壳精细化有限元模型弹塑性和塑性大变形抗震计算方法合理反映了循环荷载下钢管混凝土桥墩的滞回曲线“捏拢”效应、塑性大变形阶段承载力退化现象以及动荷载作用下的位移响应;2)当桥梁设防烈度要求为6~7度时,建议选用钢筋混凝土桥墩;当桥梁设防烈度要求为8度时,建议选用钢管混凝土桥墩;当桥梁设防烈度要求为9度及以上时,建议选用端部拉筋钢管混凝土桥墩。The seismic performance of the traditional reinforced concrete pier is insufficient under strong earthquakes,but the concrete filled steel tube(CFST)pier has better seismic performance.CFST pier has broad application prospects in highway,expressway,urban expressway and high-speed railway,and has been gradually popularized in bridge structure in recent years.In order to improve the seismic toughness of bridge piers,the ultimate seismic capacity of square section reinforced concrete piers,partially filled CFST piers,CFST piers and stirrup-confined CFST piers are compared and studied.Seismic elastoplastic and plastic large deformation time history analysis of full-size finite element models of square section reinforced concrete pier,partially filled CFST pier,CFST pier and stirrup-confined CFST pier were carried out,and the seismic limit performance and application range of different types of pier were discussed.In the analysis,the finite element software ABAQUS is used to establish a refined finite element model of solid shell.In the model,a parametric deterministic concrete triaxial plastic-damage model is adopted for the concrete stress-strain relationship,and crack insertion technology is introduced.The combined hardening-ductile damage model of steel stress-strain relationship was adopted,and the finite element model was verified by the existing experimental results of the seismic performance of reinforced concrete pier,partially filled CFST pier,CFST pier and and stirrup-confined CFST pier under unidirectional pseudo-static,unidirectional pseudo-dynamic,bidirectional pseudo-dynamic,and shake table loading test.Finally,three evaluation indexes:displacement response,cumulative energy dissipation and stiffness damage,are used to evaluate the seismic toughness of various piers under different ground motion intensity at the same cost.The analysis results show that:1)the elastic-plastic and large deformation seismic calculation methods of the refined solid-shell FE model of CFST pier can reasonably reflect the“pin

关 键 词：钢筋混凝土 钢管混凝土 桥墩 拉筋 抗震性能 震后刚度损伤 

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]