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大跨径自锚式悬索桥几何非线性行为分析

DOI: 10.3969/j.issn.1674-0696.2015.02.01, PP. 1-6

Keywords: 桥梁工程,自锚式悬索桥,几何非线性,全桥模型试验,影响线零点,大跨径,bridgeengineering,self-anchoredsuspensionbridge,geometricnonlinear,modeltestofthewholebridge,zeropointofinfluenceline,largespan

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Abstract:

:?针对大跨径自锚式悬索桥的几何非线性问题,基于非线性分析的基本原理,采用了分次加载分析自锚式悬索桥几何非线性特征的方法,在借助全桥模型试验的基础上,研究了大跨径自锚式悬索桥在施工阶段和成桥阶段主缆位移的几何非线性行为,揭示了主缆位移的几何非线性特征以及结构体系转换对主缆位移几何非线性的影响规律。结果表明:施工阶段主缆位移的几何非线性行为变化显著,主要经历了线性化特征显著、非线性特征逐渐增强、非线性特征逐渐弱化的三个阶段,且已张拉吊索对应索夹点位置和未张拉吊索对应索夹点位置的几何非线性行为变化规律不相同,其中主缆位移影响线零点具有比其它主缆位置更为明显的几何非线性特征;成桥阶段主缆位移线性化特征显著,荷载效应符合叠加原理。

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