CAJ | 학술논문

斜拉桥是高柔度超静定结构，具有强烈的几何非线性行为。以一大跨度斜拉桥为例，使用MIDAS/civil 2012有限元软件建立三维有限元动力计算模型，并对其动力特性进行分析。在此基础上，建立模型A(不考虑梁柱效应)和模型B(考虑梁柱效应)，其均考虑斜拉索的垂度效应和结构的大变形效应。参考JTG/T B02-01-2008《公路桥梁抗震设计细则》提供的反应谱数据，采用CQC振型组合方法对上述2组模型进行地震仿真分析并对其位移和内力进行比较。结果表明：梁柱效应对大跨度斜拉桥的动力特性有较大影响；由于梁柱效应，在地震作用下结构的位移和内力都有所增大，且纵桥向+竖向的地震作用比横桥向+竖向地震作用结构的梁柱效应明显。研究结论可为以后大跨度斜拉桥动力分析提供理论依据。
사랍교시고유도초정정결구，구유강렬적궤하비선성행위。이일대과도사랍교위례，사용MIDAS/civil 2012유한원연건건립삼유유한원동력계산모형，병대기동력특성진행분석。재차기출상，건립모형A(불고필량주효응)화모형B(고필량주효응)，기균고필사랍색적수도효응화결구적대변형효응。삼고JTG/T B02-01-2008《공로교량항진설계세칙》제공적반응보수거，채용CQC진형조합방법대상술2조모형진행지진방진분석병대기위이화내력진행비교。결과표명：량주효응대대과도사랍교적동력특성유교대영향；유우량주효응，재지진작용하결구적위이화내력도유소증대，차종교향+수향적지진작용비횡교향+수향지진작용결구적량주효응명현。연구결론가위이후대과도사랍교동력분석제공이론의거。
The cable-stayed bridges are high-flexibility and hyperstatic structures and have strong geometrical non-linear behavior. With a large-span cable-stayed bridge as an example, this paper establishes a definite element dynamic calculation model with MIDAS/civil 2012 definite element software and analyzes its dynamic properties. On this basis the paper constructs model A ( not considering the beam-column effect) and model B ( considering the beam-column effect) , both of which consider the sag effect of stayed cables and the large deformation effect of structures. By reference to the response spectrum data provided in JTG/T B02-01-2008 “Rules for Seismic Design of Highway Bridges”, the paper conducts seismic simulation analysis for the above two models by means of CQC vibration type combination method and compares their displacements and internal stresses. The results show that the beam-column effect has big influences on dynamic properties of large-span cable-stayed bridges; both displacement and internal force of structures increase due to the beam-column effect, and the beam-column effect on earthquake affected structures in longitudinal direction+vertical direction is more obvious than that in transverse direction+vertical direction. The research conclusion can provide theoretical basis for dynamic analysis of large-span cable-stayed bridges in the future.