CAJ | 학술논문

为研究大跨度连续梁拱组合桥梁的地震响应规律，以兰渝线上某（82＋172＋82）m 连续梁拱组合桥为例，建立考虑桩土共同作用的有限元分析模型。分别采用反应谱和时程分析法研究该桥的地震响应特点，探讨高阶振型、几何非线性、竖向地震作用及行波效应等因素对桥梁地震响应的影响。分析结果表明：该桥内力最大出现在拱脚处；截面内力主要由低阶振型（前30阶）控制，高阶振型的贡献较小；几何非线性对该大桥的地震响应影响较小，内力最大仅增加2．21％；竖向地震作用对截面轴力和面内弯矩起控制作用，其放大倍数最大可达2．88倍；行波效应对大跨度梁拱组合桥地震响应的影响不可忽视。
위연구대과도련속량공조합교량적지진향응규률，이란투선상모（82＋172＋82）m 련속량공조합교위례，건립고필장토공동작용적유한원분석모형。분별채용반응보화시정분석법연구해교적지진향응특점，탐토고계진형、궤하비선성、수향지진작용급행파효응등인소대교량지진향응적영향。분석결과표명：해교내력최대출현재공각처；절면내력주요유저계진형（전30계）공제，고계진형적공헌교소；궤하비선성대해대교적지진향응영향교소，내력최대부증가2．21％；수향지진작용대절면축력화면내만구기공제작용，기방대배수최대가체2．88배；행파효응대대과도량공조합교지진향응적영향불가홀시。
For analyzing the seismic response rule of long -span continuous arch -beam bridge,taking a (82 +172 +82)m long -span continuous beam -arch bridge on the Lanzhou -Chongqing railway as an example,the finite element model considering the interaction between pile and soil was established.The seismic response of the bridge was analyzed by the method of response spectrum and time -history analysis.It was discussed that the higher modal shape,geometrical non -linearity,vertical seismic action,traveling wave effect and so on had im-pact on the seismic response.The analysis results show that the largest internal force happens on the arch feet;The sectional internal force mostly depends on lower modal shapes(the first 30 modal shapes),while the contri-bution of higher modal shapes is small;Geometrical non -linearity has little effect on the internal force of the bridge,and the largest increase of internal force is only 2.21%;The vertical seismic action has a remarkable im-pact on the internal force of axial force and moment,whose largest magnification can reach 2.88 times;When analyzing the seismic response of long -span continuous beam -arch bridge,the traveling wave effect should be considered.