以赣江二桥为研究对象，通过有限元程序 ANSYS 15．0建立该桥的三维实体有限元模型，对大桥的静、动力特性进行了分析。结果表明：在正常使用状态内力组合和承载能力极限状态内力组合两种荷载工况下，钢－混凝土叠合梁跨中位移以及主塔位移均较小，主梁未出现拉应力，主梁及主塔应力有足够安全储备，均满足规范要求。该桥的一阶自振周期为4．2158 s，相比一般大跨斜拉桥较小，而主梁竖弯、扭曲较早出现，说明钢－混凝土叠合梁斜拉桥具有整体刚度高，对地震、风荷载等动力作用较为敏感的特点。%The Ganjiang River Second Bridge was taken as the research object and its static and dynamic performance was analyzed by adopting finite element program ANSYS15.0.The results indicated that the displacements of the beam and the main tower were small under the loads of internal force combination in service ability limit state and ultimate limit state. The main girder and the stress in main tower of each member were fit the specifications and had enough safety storage. The first-order vibration period of the bridge was 4.215 8 s,which was smaller compared to the general-span cable-stayed bridge,but the vertical bending and twisting of the beam appeared earlier,it indicated that the overall stiffness of steel-concrete composite girder cable-stayed bridge was strong,but this kind of beam was sensitive to earthquake and wind loads.
展开▼
