文中依托于某钢桥,基于正交异性板+铺装层复合模型进行最不利荷载位置分析,通过分析铺装层横向应力、纵向应力、层间剪切力确定荷载作用横向和纵向最不利位置,比较双层沥青玛蹄脂碎石混合料(SMA)铺装结构和沥青玛蹄脂碎石混合料+超高性能混凝土(UHPC)铺装结构沿横向、纵向、竖向的应力分布,分析 UHPC层厚度对铺装层应力的影响.结果表明,铺装层最不利荷载作用位置为荷载中心位于 U 肋和顶板交界处上方和横隔板跨中;SMA+UHPC 铺装层结构能显著减小 SMA层的最大拉应力,延缓 SMA 层开裂;UHPC 层厚度增加对减小 SMA 层最大横向应力效果明显,而对最大纵向拉应力影响较弱.
Finite Element Analysis of SMA+UHPC Pavement Layer Stress on Steel Bridge Deck
Based on a steel bridge,the most unfavorable load position analysis was carried out based on the composite model of orthotropic plate and pavement layer,and the transverse and longitudinal most unfavorable positions of the load action were determined by analyzing the transverse stress,longitudi-nal stress,and inter-layer shear force of the pavement layer.The stress distribution of the double-lay-er asphalt mastic gravel mixture(SMA)pavement structure and the asphalt mastic gravel mixture and ultra-high performance concrete(UHPC)pavement structure along the transverse,longitudinal and vertical directions was compared,and the influence of UHPC layer thickness on the pavement layer stress was analyzed.The results show that the most unfavorable load of the pavement layer is located above the junction between the U rib and the roof and the middle of the diaphragm span.The SMA and UHPC pavement structure can significantly reduce the maximum tensile stress of the SMA layer and delay the cracking of the SMA layer.The increase of UHPC layer thickness has an obvious effect on reducing the maximum transverse stress of the SMA layer,but has a weak effect on the maximum longitudinal tensile stress.
steel bridge pavementorthotropic steel bridge deckpartial analysisfinite element method
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