论文部分内容阅读
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。
Using ABAQUS finite element analysis software, the three-dimensional integral finite element model of the concrete-filled steel box girder bridge and the I-beam bridge was established. The mechanical responses of asphalt concrete pavement with different thicknesses under vehicle load and temperature load were studied respectively. Influence of Loading and Weight on Internal Force of Bridge Structure. The results show that under the load of vehicles, the maximum vertical shear stress of box girder bridge and I-beam bridge pavement increases by about 72% and 40% respectively when the thickness of pavement increases from 4cm to 12cm. Therefore, Layers can reduce the level of vertical shear stress, which will help to alleviate the development of rutting diseases. Under the temperature load, the influence of the thickness of pavement on the tensile stress and the shear stress at the bottom of the layer is insignificant. The basic mechanics index Which is at the same level. The maximum Mises stress and the maximum principal tensile stress of 19.62% and 17.70% of the girder bridge girder bridge can be reduced by thin layer pavement with 4cm thickness compared with 12cm pavement layer respectively under gravity load, I-beam bridge, the stress level can be reduced respectively 13.79% and 10.16%, thereby improving the bridge structure stress conditions. Visible, thin asphalt concrete applied to the deck pavement has good mechanical feasibility, taking into account the environment and material properties based on the general project can be popularized and applied.