Abstract
As a new RC structure with high seismic performance, the Unbonded Bar Reinforcement Concrete (UBRC) structure is proposed. Installing unbonded high strength bars into a RC pier, the post-yield stiffness can be easily increased and controlled. This structure can reduce not only maximum displacement response but also the residual displacement by the combination of the elastic bar's action. And the elastic bars can generate stable inelastic hysteresis loops. From the results of cyclic and pseudo dynamic loading tests, it is verified that the UBRC structure has high seismic performance. And consequently the UBRC structures also have the rational advantage for the two-level seismic design. From the trial design of the railway structure, it is found that the UBRC structure can reduce the amount of sectional area and reinforcement, but can be satisfied with the required performance of both of L1 and L2 earthquakes.
