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上埋式拱涵应变分布特性及有限元分析

Keywords: 道路工程,上埋式拱涵,性能试验,有限元,应变分布

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Abstract:

为研究高填路堤下涵洞的病害机理,对上埋式拱涵的应变分布特性进行了研究。通过对现场某实际拱涵应变的观测和有限元分析,在计算结果与工程实测吻合较好的条件下,得到了拱涵的应变分布特性。结果表明,在拱涵涵顶下部的拉应变最大,侧墙上部的应变较大,上拱45°位置的应变较小;填土荷载产生的混凝土裂缝最易在涵洞顶端下部出现,需补强。埋入EPS不仅能减小涵顶的最大竖向土压力,而且能全面改善涵拱结构的应变分布状况,从而改善涵洞断面混凝土的受力,能大幅降低涵洞混凝土的应变状态。

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