大跨度悬索桥扁平钢箱梁受力特性分析

On the stress performance of flat steel box ginder in a long-span suspension bridge

流线形扁平钢箱梁在大跨度缆索支承桥梁中应用广泛,由于其直接承受车载作用,因此,正交异性桥面结构的受力状态倍受关注。为研究大跨度悬索桥流线形扁平钢箱梁在车辆荷载作用下的受力性能,以主跨600m的中渡长江大桥为研究对象,基于大型有限元分析软件ANSYS建立该桥的三维有限元局部计算模型,分析多种车辆荷载工况下大跨度悬索桥钢箱梁各关键部位的应力水平及分布。分析结果表明:该桥正交异性桥面结构的绝大部分位置在各种不利车辆工况下,应力水平都较低;局部位置虽有较大应力集中,但仍小于屈服应力。在此基础上,分析大跨度悬索桥钢箱梁结构在车辆作用下的受力特点。

The streamlined flat steel box girder is widely used in large span cable supported bridges.In order to study the long-span suspension bridge of streamlined flat steel box girder under vehicle load bearing performance,the three-dimensional finite element model of the Zhongdu suspension bridge is established by using large-scale finite element analysis software ANSYS.The stress level and distribution of large span suspension bridge steel box girder under the vehicle load are being analyzed.The result shows that most of the stress level is relative low,and local high stress positions have the phenomena of stress focus but still within the material yield limit.On this basis,this paper summarizes the large-span suspension bridge steel box girder structure on the mechanical properties under the action of vehicle.