为研究大跨径水泥混凝土桥梁铺装层的力学响应特点,建立水泥混凝土箱梁桥、工字梁桥以及三跨连续梁桥模型,在此基础上对铺装层在桥梁整体结构中所产生的应力应变响应进行分析.采用ABAQUS有限元分析软件,建立了桥梁三维有限元整体模型,分别研究了不同厚度铺装层在各种跨径条件下,在车辆荷载和温度荷载作用下的力学响应.研究结果表明:桥梁跨径与铺装层厚度对铺装层力学响应的影响相互独立;大跨径桥梁在车辆荷载作用下将导致铺装层水平拉应力显著增长,而竖向剪应力及层底剪应力则变化不大;温度荷载作用下,桥梁跨径对铺装层温度应力的影响十分有限.因此,在大跨径水泥混凝土桥梁中,应采用具有较强抗拉及抗裂性能的铺装层材料,以保证铺装层的路用性能及使用寿命.%In order to investigate the mechanical response of deck pavement on long-span cement concrete bridges, a box girder bridges, flanged girder bridge and continuous girder bridge were modeled respectively. The finite element analysis software ABAQUS was utilized to build three-dimensional models for these three types of bridges. The mechanical responses of different thickness deck pavements on the bridges with different spans under traffic and thermal loadings were analyzed. The results indicated that the effects of the bridge span and pavement thickness on the pavement mechanical response were independent. The longer span bridge undergone vechile loads would significantly increase horizontal tensile stress in the pavement, while vertical shear stress in the pavement and the shear stress at the bottom layer changed little. However, the effect of the bridge span under thermal loading was not obvious to the thermal stress in the pavement. Therefore, the pavement materials of high tensile strength and anti-cracking performance should be utilized in the long-span cement concrete bridges. Thereby, the pavement performance and service life could be guaranteed.
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