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无应力索长误差对千米级混合梁斜拉桥影响分析

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Keywords: 桥梁工程,混合梁斜拉桥,几何控制法,无应力索长误差,超大跨度

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Abstract:

以鄂东长江公路大桥为依托,充分考虑非线性效应,基于几何控制法,研究拉索无应力长度误差对超大跨度混合梁斜拉桥成桥线形及内力的影响,发掘千米级混合梁斜拉桥边中跨结构力学行为特点及控制手段。计算分析揭示了超大跨度混合梁斜拉桥边中跨结构的差异,致使无应力索长误差对中跨成桥线形影响远大于边跨,对边跨成桥内力的影响则大于中跨部分,边中跨结构在受力上具有相对独立性全桥应力变化百分比最大处位于钢-混结合段,该区域受力复杂,需引起施工及设计的高度重视梁体刚度的差异,对成桥索力重分配产生重要影响,边中跨索力变化呈现不同特征。

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