正交异性钢桥面结构对铺装受力的影响及其优化

Effect of Orthotropic Steel Deck on Pavement and its Optimization

采用有限元方法建立一座正交异性钢桥面连续梁桥的全桥空间有限元模型;在桥面施加不利车辆荷载,分析桥面板厚度和U型加劲肋厚度等因素对桥面铺装层应力的影响。分析结果表明:横向最大拉应力对铺装层受拉开裂起控制作用;随着桥面板厚度和U肋厚度的增加,桥面铺装层所受的横向最大拉应力有所减小;顶板厚度从12 mm增加至20 mm,铺装层横向最大拉应力从0.62 MPa减小至0.52 MPa,降低16%;U肋厚度从6 mm增加至12 mm,铺装层横向最大拉应力从0.63 MPa减小至0.51 MPa,降低19%。顶板厚度变化和U肋厚度变化与铺装层受力变化均为非线性关系。

A finite element model of a continuous orthotropic steel bridge is established by the finite element method to analyze the stresses on the deck pavement due to the factors such as the thickness of decks and U-ribs when the pavement is exerted by the vehicle load. The analytical result shows that the control effect of pavement tensile destruction is from the maximum transverse tensile stress. The maximum transverse tensile stress of the pavement decreases with the increase of thicknesses of decks and U-ribs. When the deck thickness increases from 12 mm to 20 mm, the maximum transverse tensile stress of the pavement decreases from 0.62 MPa to 0. 52 MPa, decreasing by 16%. When the thickness of U-ribs increases from 6 mm to 12 mm, the maximum transverse tensile stress of the pavement decreases from 0.63 MPa to 0.51 MPa, decreasing by 19%. The changes in the thickness of decks and U-ribs, and the pavement stress are all nonlinear.