大跨度斜拉钢管混凝土拱桥屈曲分析  

Buckling Analysis of Long-Span Cable-Stayed Concrete Filled Steel-Tubular Arch Bridge

作　　者：陈冠桦[1] 甄喻惠[1] 贾宏宇[2] 柳红卫[3] 王登科[4] 

机构地区：[1]贵州省交通规划勘察设计研究院,贵阳550001 [2]西南交通大学土木工程学院,成都610031 [3]广东省安全科学技术研究所,广州510060 [4]中国科学院武汉岩土力学研究所,武汉430071

出　　处：《河南大学学报（自然科学版）》2010年第5期537-541,共5页Journal of Henan University:Natural Science

基　　金：交通部西部交通建设科技项目(200531800017)

摘　　要：以某大跨度斜拉钢管混凝土拱桥为研究对象,利用有限元软件ANSYS建立该桥的空间有限元模型,计算该结构的线弹性和几何非线性屈曲稳定系数、屈曲模态,分析结构稳定性能的特点,并与同等跨度的系杆拱桥稳定性能进行了对比分析.结果表明:横向刚度对结构稳定性起控制作用,屈曲模态表现为面外对称侧倾失稳,线弹性屈曲稳定系数大于4.0,结构的稳定性满足使用要求;拉索对系杆拱结构面内稳定贡献较大,对结构面外稳定贡献非常小;结构面外和面内稳定系数均比同等跨度系杆拱桥高;关键位置的位移、应力时程曲线图中几何非线性现象不明显,几何非线性对结构屈曲的影响程度较小.Taking a certain long-span cable-stayed concrete filled steel-tubular arch bridge as research object,the space finite element model of the bridge is established through the application of the finite element analysis software ANSYS.The linear elasticity,geometrical nonlinear buckling stability coefficient and buckling mode of the structure are calculated.Additionally the characteristics of the stability performance is analyzed.The stability performance of the bridge is furthermore under comparative analysis with another coequal span tied arch bridge.The results show that lateral stiffness have a main control over the structural stability.The buckling mode is manifested as out of plane roll instability.The linear-elastic buckling stability coefficient is larger than four,the stability of the structure meets the use requirement;the stayed-cable has a great contribution to the stability in plane of tied arch structure while a very small contribution to the stability out of plane;the stability coefficients of in plane and out of plane are higher than a coequal span tied arch bridge;the geometrical nonlinearities of the displacement as well as stress time curve of the key position are not obvious.The geometrical nonlinearities exert a rather small influence on structural buckling.

关 键 词：斜拉钢管混凝土拱桥 屈曲分析 屈曲模态 有限元 系杆拱桥 

分 类 号：U448.141.5[建筑科学—桥梁与隧道工程]