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鄂东长江大桥施工过程静力弹性稳定性

, PP. 100-104

Keywords: 桥梁工程,斜拉桥,安全系数,静力弹性稳定性,施工

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Abstract:

应用静力弹性稳定研究方法和有限元实现,对以边中跨为非对称结构、大跨度混合梁的鄂东长江斜拉大桥通过建立LSB和ANSYS模型,分析施工过程中的稳定性。对弹性稳定安全系数的计算结果与规范值进行了比较。研究结果表明钢箱梁悬臂施工过程中结构弹性稳定安全系数呈现逐渐增大_缓慢平稳变化_明显下降的趋势,在每段钢箱梁施工过程中有明显的波动;成桥后主要运营阶段没有明显的波动处于一种相对恒定的承载能力状态等的变化规律;施工过程呈现索塔纵向失稳和钢箱梁竖向失稳的组合失稳模式。

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