钢桥面复合铺装结构永久变形预估

Research on permanent deformation of steel deck pavements with different combinations

摘要:

针对浇注式与环氧沥青混凝土两种铺装材料组成的五类铺装结构，采用恒高度剪切疲劳试验对铺装材料的流变特性进行试验研究，根据试验结果，利用多元非线性回归方法获得基于Bailey-Norton模型的铺装材料高温蠕变参数；而后，建立正交异性钢桥面铺装复合结构有限元模型，仿真模拟60℃下铺装的永久变形；最后，利用等厚度修正的车辙试验对五类铺装结构的永久变形仿真结果进行了试验验证。研究表明：浇注与环氧组成的异性铺装结构中，铺装永久变形贡献率大部分是浇注式沥青混凝土，而环氧沥青混凝土的贡献率很小；浇注或环氧组成的双层同质铺装结构中，铺装车辙变形主要发生在上面层。研究内容为钢桥面铺装结构与材料的高温变形设计提供理论支撑。

Abstract:

For five types of pavement structures combined with gussasphalt and epoxy asphalt concrete, the repeated shear tests with constant height were conducted to obtain the rheological characteristics of the two pavement materials firstly. And then, the creep parameters of pavement materials were fitted with multiple nonlinear regression based on Bailey-Norton model. With the parameters of materials, the finite element model of orthotropic steel deck pavement were established to simulate the permanent deformation of pavement at 60 degrees Celsius. Finally, the simulation results were verified through modified wheel track test. Research results show that in the two-layers pavement structures combined with different asphalt concrete, gussasphalt concrete has the most of deformation contribute rate, while epoxy asphalt concrete has the less of deformation contribute rate. However, in the two-layers pavement structures combined with same asphalt concrete, the rutting damage happened at surface course. The research findings provides technologies foundation for high-temperature performance design of structures and materials of steel deck pavement.