钢箱梁桥面铺装体系结构优化研究

Investigation on Structural Optimization of Paving System on Steel Box Girder Bridge Decks

采用有限元分析的结构优化设计方法对钢箱梁桥面铺装体系进行整体优化研究。建立钢桥面铺装体系的有限元模型,选择包括钢板厚度、梯形加劲肋刚度、横隔板间距、铺装厚度等结构参数作为设计变量,建立铺装最大拉应力、铺装与钢板层间最大剪应力、加劲肋挠跨比、钢桥面板最大拉应力等指标的约束条件,采用零阶方法进行优化计算。结果表明,优化设计可以节省材料,降低造价。通过减小梯形加劲肋间距和横隔板间距,增大桥面板厚度和梯形加劲肋高度,可改善铺装的受力状况。

To achieve optimization design of the deck pavement system on steel bridge deck,the struc-tural optimization method was used based on the Finite Element （FE）analysis.Firstly,the FE model of pavement system on steel bridge deck was built.Secondly,the structural design variables were se-lected including deck thickness,parameters of stiffening ribs,the distance between transverse dia-phragms,and pavement thickness.Constraint conditions were set up including maximum tensile stress in pavement,maximum shear stress between the pavement and the deck,deflection ratio of ribs,and maximum tensile stress in steel decks.Finally,after the objective function was determined, the optimization calculation was carried out by the first order second moment method.Results indicate that the optimization can save the materials and consequently reduce the costs.The findings also sug-gest that the reduction in the distance between stiffening ribs and the distance between transverse dia-phragms,or the increase in the deck thickness and the height of ribs can improve mechanic condition of pavement.