不同变墩高形式下曲线桥偏心支承墩柱地震易损性分析  

Analysis of the seismic vulnerability of eccentrically supported pier columns of curved bridges under different variable pier height forms

作　　者：焦驰宇 王琛琛[3] 刘洋 方蓉 肖春 JIAO Chiyu;WANG Chenchen;LIU Yang;FANG Rong;XIAO Chun(Beijing Urban Transportation Infrastructure Construction Engineering Technology Research Center,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Ancient Bridge Research Institute,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Multi-Functional Shaking Tables Laboratory,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Eternal Estate Engineering Design Co.,Ltd.,Chengdu 610017,China)

机构地区：[1]北京市城市交通基础设施建设工程技术研究中心,北京100044 [2]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京100044 [3]北京建筑大学古桥研究院,北京100044 [4]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [5]北京建筑大学大型多功能振动台阵实验室,北京100044 [6]中恒工程设计院有限公司,四川成都610017

出　　处：《地震工程与工程振动》2025年第2期97-105,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52078023,52378472);北京市自然科学基金-北京市教委联合重点项目(23JH0014);北京建筑大学建大领军人才计划B类项目(JDLJ20220807);北京市博士后工作经费资助项目(2023-zz-137)。

摘　　要：受地形及交通线路的影响,墩柱偏心支承小半径变墩高曲线桥被广泛采用。由于不同墩高之间的差异带来的桥梁非规则性,往往导致墩柱偏心支承小半径曲线桥桥墩呈现压弯剪扭多种耦合受力。文中以某互通式立交匝道桥为工程背景,基于非线性有限元软件建立集中铰-纤维模型,采用增量动力分析法分析渐变型和凹岛型2种变墩高布置形式下墩柱偏心支承曲线桥的桥墩地震易损性。研究结果表明:在小半径偏心变墩高曲线桥中,中间墩发生扭转损伤的概率较高;当墩柱发生扭转损伤时,凹岛型下桥墩各破坏等级的超越概率大于渐变型,从而将产生更严重的扭转破坏,在抗震设计中应避免选择该布置形式或提升中间墩的抗震能力。文中相关研究成果可为同类桥梁提供依据。Due to the influence of topography and traffic routes,small radius curved bridges with eccentrically support piers and variable pier heights are widely used.Due to the irregularity of the bridge caused by the difference in pier heights and the eccentric supports,a complex stress form of pressure-bending-shearing-torsion coupling in the eccentrically support pier will occur.Taking an interchange ramp bridge as the engineering background,a centralized hinge-fiber model based on nonlinear finite element software was constructed.The seismic vulnerability of eccentrically compressed piers in two models was compared by adopting the incremental dynamic analysis method.These two models include a model with the concave-type variable height piers(the CTVHP0x09 curved bridge)and a model with gradient variable height piers(the GVHP curved bridge).The results show that:in the small radius bridge with eccentrically support pier and variable pier heights,the probability of torsional damage of the intermediate pier is higher.When the pier torsional damage occurs,the exceeding probability of each pier damage level in the CTVHP curved bridge is greater than that in the GVHP curved bridge,which will lead to more serious torsional damage.Therefore the arrangement of the CTVHP curved bridge should be avoided in seismic design,at the same time,the seismic capacity of the intermediate pier should be enhanced.The research results of this paper can provide a basis for similar bridges.

关 键 词：曲线桥 墩柱偏心支承 变墩高布置形式 压弯剪扭耦合作用 地震易损性分析 

分 类 号：TU4[建筑科学—土工工程] P315.9[天文地球—地震学]