Abstract:In the design of steel bridge deck pavement, due to the elevation control and self-weight control requirements, ordinary concrete pavement is hard to meet the design requirements because of large thickness and high self-weight. Therefore, it is necessary to need a thin-thickness and high-performance paving layer. The ultra-high performance concrete (UHPC) is potentially a suitable bridge deck pavement material. However, there is a lack of experimental study on the bonding effect between UHPC paving layer and steel plate in the cyclic traffic load. The fatigue bending test and shear test are studied. The bonding properties and fatigue failure resistance of UHPC steel deck paving layer are studied. And based on the result of numerical calculation, the fatigue loading times are converted to the standard axle load action times. The study shows that it is hard to quickly damage the specimen under the standard vehicle wheel load action. Even if the specimen bonding interface edge cracks, the stable and invariable deformation also suggests that the cracks have not extended to the interior, which is that the internal damage of the specimen is limited still with the good bearing capacity. The equivalent shear strength of the UHPC - steel deck bonding interface with studs is about 12.4 MPa. Its failure mode is the shear failure of the stud. The cooperating action between UHPC and steel plate is very obvious. Compared with the steel plate without pavement, its stiffness increases by about 1 times.