Development of a New Seismic Retrofit Method Reinforcing only Twosides of RC Bridge Pier with Bar Cut-off Sections

摘要

The new seismic retrofitting method in which reinforcing members were placed only on two-sidesrnof pier structure in order to improve bending moment capacity at termination of mainrnreinforcements was developed, which enables to avoid replacement of machine room underrnviaduct. In this paper, beam tests were carried out and it was clarified that bending momentrncarried by reinforcing members were proportional to flexural rigidity of reinforcing members andrnreinforced length within shear span. Then cyclic loading tests for model specimen of existing pierrnstructures were carried out and it was also clarified that bending moment capacity at longitudinalrnbar cut-off points in which moment capacity are smaller than base of the pier could be improvedrnby proposed retrofitting method and damage at the cut-off points can be avoided under seismicrnloading.