子模型法在大跨钢桥面铺装有限元模型优化中的应用

为了提高大跨钢桥桥面铺装有限元分析简化模型的计算精度,在用子模型法对钢箱梁桥面铺装进行精细模拟的基础上,运用有限元正交数值模拟试验和综合评价方法对模型几何尺寸与边界约束条件进行优化。发现大跨钢桥桥面铺装有限元分析简化模型合理的几何尺寸与边界条件为:纵向为3跨,横向有8个U肋,横隔板高度为1.2 m,纵边自由,横边简支,横隔板底固结。对比分析结果表明:该简化模型具有较高的计算精度,横向拉应变误差仅为0.7%,纵向拉应变误差为3.7%,可供大跨钢桥面铺装力学分析和设计参考使用。

Application of Submodel Method of FE Model Optimization for Long-span Steel Bridge Deck Pavement

In order to improve the computation precision of simplified FE model for mechanical analysis of deck pavement of long-span steel bridge,model size and boundary conditions were optimized using orthogonal numerical simulation experiment and comprehensive evaluation method on the basis of precise simulation by submodel technology.It was found that a reasonable simplified FE model should have such dimension and constraints:three spans in longitudinal direction with a free border,8 U-shape ribs in transverse direction with a simple supported border,and a diaphragm height of 1.2 m with a fixed bottom.Comparison between the results obtained from simplified FE model and those from submodel technology shows that(1)the simplified FE model has high precision;(2)the relative error of transverse tensile strain is 0.7%;and(3)the longitudinal tensile strain error is 3.7%.The simplified FEM can satisfy the need of project design.