Abstract
In major earthquakes, friction sliding of common laminated elastomeric bearings limits the force transmitted from the superstructure to the substructure. Experiments were carried out to investigate the ultimate shear performance and the friction sliding response of laminated elastomeric bridge bearings. First, the hysteresis curve of the common laminated elastomeric bearings present narrow ribbon which meant the energy dissipation capacity induced by the shear deformation was weak. The ultimate shear deformation of the bearings could reach 300 % to 400 % of the elastomeric thickness. The damage of bearings was mainly focused on the rubber layer fracture. Second, the energy dissipation capacity of elastomeric bearings induced by the friction sliding was larger than the shear deformation, and was similar with the lead rubber bearing. Since the total displacement include both elastomer shear deformation and sliding components, the dissipated energy continuously increased with the increasing of the sliding distance. When the tests finished, the bearings were basic intact, only the rubber surface was worn down. Last, the bilinear elastic-plastic model is proposed to take as the theoretical model of the elastomeric bearing with friction sliding for the research and design of bridge in earthquake.
Highlights
In recent earthquakes in China, the damage of middle and small span girder bridges are mainly consisted of girders falling, bearings sliding, collision of the adjacent girders in the expansion joint, and restrainer or abutment damage
The relative friction sliding between the bearing and the contact surface of the pier reduces the horizontal seismic load transmitted to the substructure, which plays a role in seismic isolation [1]
The main conclusions are as follows: 1) Under cyclic horizontal loading, when the shear deformation reached 200 %, the outer protective elastomeric layer of the normal laminated elastomeric bearings became separated from the bearing body
Summary
In recent earthquakes in China, the damage of middle and small span girder bridges are mainly consisted of girders falling, bearings sliding, collision of the adjacent girders in the expansion joint, and restrainer or abutment damage. The relative friction sliding between the bearing and the contact surface of the pier reduces the horizontal seismic load transmitted to the substructure, which plays a role in seismic isolation [1]. S. Steelman et al [12, 13] proposed the sliding friction mechanical model of elastomeric bearings during an earthquake and analyzed the effect of the bearing sliding on the seismic performance of bridges. Wang Junjie et al [20] proposed the restoring mechanism model considering the failure process of bearings and analyzed the effect of the bearing damage on the seismic response of continuous girder bridges. To fully ascertain the ultimate shear failure state and friction sliding performance of laminated elastomeric bearings, low-frequency cyclic loading tests were conducted. The results were compared with a LRB
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