Abstract
A seismic retrofit of existing bridges using a bearing support with knock-off functions and a performance confirmation experiment were conducted. As a result, the responses of piers were reduced in elasticic ranges within the permissible values. By changing the horizontal support condition in the transverse direction into movable from fix condition, it was confirmed that the superstructure was behaved elastic responses. After performing a performance test of the knock-off bearing support, valuable information was collected for fracture and strength characteristics notched bolts. Furthermore, it was confirmed that the bolt was fractured at a load satisfying the required performance from the seismic design.
