张拉索膜人行拱桥设计研究

Research on Design of Tension-cable Membrane Arch Footbridge

摘要:

张拉索膜结构近年来在大型公共建筑中得到了广泛的应用，然而在桥梁工程鲜有应用。介绍了某张拉索膜人行拱桥的设计思路，并采用MIDAS Civil和ABAQUS分别对结构进行整体和局部分析。结果表明，人行桥竖向刚度大，结构应力水平较低，受力合理。索膜结构不但参与结构受力，还可充当人行桥顶棚，满足为行人遮阴避雨的功能要求，实现了结构和功能的统一。局部分析结果显示，整体分析模型中采用可考虑翘曲效果的七自由度梁单元模拟受力复杂构件时精度较差。相关设计思路和分析结果可为今后同类工程提供参考。

Abstract:

The tension-cable membrane structure has been widely used in large public buildings in recent years, but it is rarely applied in bridge engineering. The design idea of a tension-cable membrane arch footbridge is introduced, and the overall and local structures are analyzed by using MIDAS Civil and ABAQUS respectively. The results show that the vertical stiffness of the footbridge is large, the structural stress level is lower, and the stress is reasonable. The cable-membrane structure not only participates in the structural force, but also acts as the roof of the footbridge to meet the functional requirements of shade and rain shelter for pedestrians, which realizes the unity of structure and functions. The local analysis result shows that in the overall analysis model, the accuracy of the seven-degree-of-freedom beam element considering the warping effect is poor when simulating the complex components under stress. The related design ideas and analysis results can provide the reference for similar projects in the future.