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PC梁桥结构参数对最大悬臂结构力学性能的敏感性分析

, PP. 95-99

Keywords: 桥梁工程,结构参数,敏感性分析,预应力混凝土梁桥,最大悬臂阶段

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Abstract:

为了深入研究PC梁桥结构参数对最大悬臂结构力学性能的影响,结合实体工程,建立了大跨预应力混凝土梁桥的最大悬臂段有限元模型,分析了材料容重、混凝土弹性模量、预应力参数偏差对最大悬臂施工阶段主梁线形的影响程度,研究了自重偏差对主梁结构内力和应力的影响,探讨了预应力对悬臂结构的作用效应。研究结果表明材料容重和混凝土弹性模量为该桥梁结构的主要设计参数,桥梁自重偏差对结构线形影响最为明显;在预应力效应的作用下,主梁纵向产生竖向正位移,随着自重的增大,主梁同一截面正弯矩相应减小,墩顶负弯矩增大,主梁的上缘压应力会减小,下缘压应力会增大,且下缘应力受其影响的程度更大。

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