建立跨中截面三维计算模型，比较三维与二维流场数值模拟的异同。
Thirdly, a 3D computation model of the mid-span section deck was established, the similarity and difference between 2D and 3D numerical simulation of flow field are compared also.
计算结果表明：跨中截面上下缘应力计算值与试验值误差在5%左右，跨中挠度误差在1%左右。
The result indicated that, the section upper and lower reason stress error is about 5% while stepping, the deflection error, about 1%.
通过考虑接触与不考虑接触两种情况时桥面板跨中截面的受力分析，验证该问题中接触有限元模型的正确性。
By analysis of the middle section stress of the hollow slab in the two situations of consider contact and not consider contact, verified the accuracy of contact finite element model in that situation.
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