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薄层沥青混凝土在桥面铺装中的力学响应

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Keywords: 桥梁工程,薄层沥青混凝土,三维有限元方法,桥面铺装,整桥力学分析

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Abstract:

采用ABAQUS有限元分析软件,建立水泥混凝土箱梁桥与工字梁桥三维整体有限元模型,分别研究了不同厚度薄层沥青混凝土铺装层在车辆荷载和温度荷载作用下的力学响应,以及铺装层自重对桥梁结构内力的影响。研究结果表明在车辆荷载作用下,铺装层厚度由4cm增加至12cm时,箱梁桥与工字梁桥铺装层最大竖向剪应力分别增长了约72%与40%,因此,薄层铺装能够降低层内竖向剪应力水平,有利于缓解车辙病害的发展;在温度荷载作用下,铺装层厚度对层内拉应力及层底剪应力的影响并不明显,力学指标基本处于同一水平;在重力荷载作用下,厚度为4cm的薄层铺装相对于12cm的铺装层能够分别降低箱梁桥桥体内部最大Mises应力及最大主拉应力19.62%与17.70%,而对于工字梁桥而言,能够分别降低应力水平13.79%与10.16%,从而改善了桥梁结构受力状况。可见,薄层沥青混凝土应用于桥面铺装具有良好的力学可行性,在综合考虑环境与材料性能的基础上可在实际工程中推广应用。

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