考虑预应力效应的人行悬索桥的非线性力学行为分析

人行柔性悬索玻璃景观桥在荷载作用下存在复杂的大变形非线性力学行为,采用传统结构力学方法进行计算分析存在困难。文中通过考虑拉索的预应力效应及其应力刚度,研究不同拉索张拉应力和不同预应力张拉顺序时的拉索应力和挠度的变化规律,实现了柔性悬索结构的大变形及其非线性力学行为的分析。研究结果显示不同拉索的张拉里对于悬索结构跨中的最大挠度有着明显的影响,随着预张拉力的增加其最大挠度减小。柔性悬索结构的变形与所施加荷载之间存在明显的非线性关系。不同的预应力张拉顺序可影响整个柔性悬索结构的位移和成桥时的最终应力状态。柔性悬索桥结构设计分析时需要考虑预应力张拉顺序对最终完成拉索张拉时结构应力的影响。

NONLINEAR MECHANICAL BEHAVIOR ANALYSIS OF PEDESTRIAN SUSPENSION BRIDGE CONSIDERING PRESTRESS EFFECT

The pedestrian flexible glass bridge has a complex large-deformation nonlinear mechanical behavior under load, and it is difficult to calculate and analyze by traditional structural mechanics. In this paper, by considering the prestressing effect of the cable and its stress stiffness, the variation law of the cable stress and deflection of different cable tensile stresses and different prestressed tension sequences is studied, and the large deformation of the flexible suspension cable structure and its Analysis of nonlinear mechanical behavior. The results show that the tension of different cables has a significant effect on the maximum deflection of the suspension structure span, and the maximum deflection decreases with the increase of the pre-tension. There is a significant nonlinear relationship between the deformation of the flexible suspension structure and the applied load. Different prestressed tension sequences can affect the displacement of the entire flexible suspension structure and the final stress state when the bridge is bridged. In the design analysis of the flexible suspension bridge, the influence of the prestressed tension sequence on the structural stress of the final cable tension should be considered.