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针对上面层为沥青玛碲脂碎石(SMA)、下面层为沥青玛碲脂(MA)的正交异性钢桥面铺装结构,建立钢桥面铺装有限元模型,通过三轴重复加载试验获得铺装材料的粘弹性参数,进行车辙有限元计算;借助大型足尺环道试验,验证了模型单元及参数选择的可靠性;分析了铺装层厚度、超载、钢桥面结构形式等因素对于车辙深度的影响情况。研究表明:对于SMA+MA双层铺装结构,车辙主要发生在MA层;铺装层厚度对车辙的影响显著,在一定范围内,随着厚度的增加,车辙深度迅速增加;随着荷载压强增加,车辙深度增大,且超载对下面层MA的影响大于上面层SMA;钢桥面结构形式中,钢板厚度与横隔板间距的改变对车辙影响不明显。该研究内容可为钢桥面铺装设计提供参考依据。
For the upper layer of asphalt mater tallow gravel (SMA), the lower layer is asphalt marestar (MA) orthotropic steel deck pavement structure, the establishment of steel deck pavement finite element model, through three-axis repeated loading The viscoelastic parameters of pavement materials were obtained by experiments and the rutting finite element method was calculated. The reliability of model elements and parameters selection was verified by means of large-scale full-scale annular test. The effects of pavement thickness, overloading and steel deck structure were analyzed The impact of factors on rutting depth. The results show that the rut mainly occurs in the MA layer for SMA + MA double-deck pavement structure. The influence of the pavement layer thickness on rutting is remarkable. Within a certain range, the rutting depth increases rapidly with the increase of thickness. With the increase of load pressure The rutting depth increases and the influence of overloading on the MA of the lower layer is greater than that of the upper layer SMA; in the steel bridge deck structure, the change of the thickness of the steel plate and the distance between the horizontal baffle plates have no obvious effect on the rutting. The research content can provide reference for the design of steel bridge deck pavement.