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-  2018 

基于变形协调原理的多塔斜拉桥竖向刚度分析 Analysis of vertical stiffness of multi-tower cable-stayed bridge based on principle of deformation coordination

Keywords: 多塔斜拉桥,边塔,非边塔,变形协调,拉索竖向支承刚度,参数分析

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Abstract:

为深入探寻多塔斜拉桥的刚度特征、分析多塔斜拉桥结构力学特性,选取多塔斜拉桥的最典型形式——三塔斜拉桥,基于变形协调原理,求解单位荷载作用下多塔斜拉桥的拉索竖向弹性支承刚度公式,对推导的公式进行算例验证,并分析桥梁结构主要参数对拉索竖向支承刚度的影响.研究结果表明:对边塔非边跨和非边塔左跨分别施加单位荷载时,由该公式解求得的边塔非边跨跨中挠度值与有限元解之间的误差为6.27%,求得的非边塔跨中挠度值与有限元解之间的误差为5.79%.文中解的结果比有限元解偏大的主要原因是:公式解没有考虑斜拉索的垂度效应,单位荷载作用下所产生的水平力有一部分消耗在拉索的垂度效应中,但公式推导时没有考虑拉索垂度效应,导致主梁跨中挠度偏大.推导的拉索竖向支承刚度公式可以较真实地反映多塔斜拉桥的刚度特征,符合多塔斜拉桥概念设计的要求

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