Abstract:The shear slip of bearing under earthquake can dissipate part of energy and reduce the damage of bridge substructure. In order to study the shear energy dissipation performance of slab rubber bearings of small and medium span bridges, three groups of unilateral sliding bearings with different axial stresses and one group of non-sliding bearings were compared. shear slip phenomena, cyclic curves, equivalent stiffness and equivalent damping ratio of bearings under different axial stresses were analyzed. The results show that the sliding displacement, the void, and the hysteresis curve area of the bearing increase, and the energy consumption is significantly enhanced with the reduction of axial stress. However, the effective shear deformation and stiffness of the bearing itself are limited. Small and medium-span bridges can dissipate energy in earthquake by friction slip of rubber bearings The results of this study provide quantitative mechanical indexes for further safety and reliability evaluation of serving concrete beam bridges.