以润扬长江公路大桥为工程背景，通过有限元数值模拟技术，分析建立其北汊斜拉桥和南汊悬索桥的三维整桥模型，进行整桥力学分析，提出整体—局部分析方法，进而分析铺装层的受力特点；悬索桥的桥型对铺装层的受力影响较大，作者计算的铺装层拉应力明显大于以往模型；对于斜拉桥跨中位置，考虑整桥后铺装层的受力略大于局部模型，对于承受斜拉索水平分力挤压的主梁部分，其铺装的受力略小于局部模型。

Based on the Runyang Yangtze River Highway Bridge, which consiss of one cable-stayed bridge of South Branch and one suspension bridge of North Branch, the three-dimensional overall bridge model was established using the FEM numerical simulation to analyze the bridge deformation and mechanical performance. And a global-local analysis method was proposed to study the mechanical properties of surfacing. The shape of suspension bridge has large effects on the mechanical performances of the surfacing. The tensile stress obtained in this paper is significantly bigger than those by the traditional model. For the central section of the cable-stayed bridge, the mechanical indexes values of the surfacing obtained by this method are little bigger than those by the traditional model; otherwise, for the other sections of the main girder that undertake the horizontal component compression of the cable, the tensile stress values of the surfacing are little smaller than those by the traditional model.