Abstract：Based on the sliding of laminated-rubber bearings for short to medium-span girder bridges observed in Wenchuan earthquake, shaking table tests were used to investigate the effects of bearing sliding on the seismic performance of these types of bridges. A simply-supported, T-girder bridge with a span length of 25m was selected as the prototype, and a 1/4 scale bridge model was then designed and constructed just based on the bridge prototype. The bridge model was subjected to a near-fault earthquake record on the shaking tables. A series of shaking table tests were conducted on the bridge model with different types of superstructure-substructure connections. Results show that (1) The laminated-rubber bearings will slide along the girders under strong excitations, which to some extent provides isolation for the substructure; (2) Although concrete shear keys can restrain the girder displacements during small earthquakes, the restraining effect may diminish under strong earthquakes, especially when bearing sliding occurs; (3) Elastic-plastic retainers are proved to have powerful energy dissipation capacities. They can effectively control the maximum and residual seismic displacements of girders, and simultaneously, the yielding of retainers can prevent severe damages of substructures.
项乃亮 李建中. 考虑板式支座滑移的中小跨度梁式桥振动台试验[J]. 土木工程学报, 2018, 51(7): 104-111.
Xiang Nailiang Li Jianzhong. Shaking table tests of a short to medium-span girder bridge considering the sliding of laminated-rubber bearings. 土木工程学报, 2018, 51(7): 104-111.
