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基于重力刚度法的三塔悬索桥形变特征研究

DOI: 10.3969/j.issn.1674-0696.2015.01.02, PP. 6-11

Keywords: 桥梁工程,重力刚度法,位移方程,三塔四跨,悬索桥,挠度分析,bridgeengineering,thegravitystiffnessmethod,displacementexpressions,three-pylon-four-span,suspensionbridges,deflectionanalysis

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Abstract:

:？应用重力刚度法推导了集中力和均布载荷作用下三塔四跨悬索桥主缆的无量纲位移的理论表达式；分析了跨数、边中跨比以及恒载和活载集度对三塔四跨悬索桥重力刚度挠度的影响规律，及三塔四跨悬索桥不同于两塔悬索桥的新特征。研究表明：多跨悬索在恒活载作用下主缆的力学特征主要决定了三塔四跨悬索桥整体结构刚度的基本特征，单跨悬索和多跨悬索力学行为的差异是两塔和三塔悬索桥力学特征差异产生的根本原因；应用重力刚度法分析的三塔悬索桥行为特征与基于有限元方法计算的结构行为特征有很好的一致性。

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