大跨度公铁两用斜拉桥板桁主梁受力特性研究

发布时间：2018-02-23 01:14

本文关键词： 斜拉桥公路铁路两用桥板桁主梁正交异性板刚度参数分析有限元法　出处：《桥梁建设》2014年06期 　论文类型：期刊论文

【摘要】：为研究大跨度公铁两用斜拉桥板桁主梁整体受力性能和铁路桥面系局部受力性能,以(84+196+532+196+84)m平潭海峡公铁两用大桥主桥为背景进行分析。采用ANSYS建立全桥和不同节段长度主梁的三维板桁结构精细化有限元模型,对板桁主梁的整体刚度和桥面板局部刚度进行计算,并对比分析铁路桥面系构件参数(板桁连接方式、桥面板厚度、横梁刚度、纵梁及U肋厚度)对主梁刚度的影响。分析结果表明,板桁主梁中横梁位置处钢轨的竖向线刚度较大,两横梁之间竖向线刚度较小,钢轨的竖向线刚度沿纵向周期性波动。铁路桥面板厚度对桥梁整体扭转刚度影响明显,铁路桥面板局部刚度与横梁、纵梁和U肋密切相关。
[Abstract]:In order to study the integral mechanical behavior of the slab truss main girder of the large-span cable-stayed bridge and the local mechanical behavior of the railway deck system, Based on the analysis of the main bridge of 84,196532 19684m Pingtan Strait Highway and Railway Bridge, the fine finite element model of three-dimensional plate-truss structure of the whole bridge and the main girder with different segment length is established by using ANSYS. The overall stiffness and local stiffness of slab truss main girder are calculated, and the parameters of railway deck member (slab truss connection mode, bridge deck thickness, beam stiffness) are compared and analyzed. The analysis results show that the vertical line stiffness of rail in the beam position of plate truss is larger, and the vertical line stiffness between the two beams is smaller, the analysis results show that the longitudinal beam and the thickness of U rib affect the stiffness of the main beam, and the results show that the vertical stiffness of the rail in the beam is larger than that between the two beams. The vertical stiffness of the rail fluctuates periodically along the longitudinal direction. The thickness of the slab of the railway bridge has an obvious effect on the torsional stiffness of the whole bridge, and the local stiffness of the slab of the railway bridge is closely related to the beam, longitudinal beam and U-rib.
【作者单位】：加州大学洛杉矶分校土木与环境工程系;西南交通大学桥梁工程系;
【分类号】：U441;U448.27

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