2021 Volume 77 Issue 1 Pages 69-82
A new seismic retrofitting method which is called the side retrofitting method was developed. The side retrofitting method is the method reinforcing flexurally the termination zone of the longitudinal bars of RC bridge pier which reinforcing members were placed only two-sides of the pier and enables to retrofit without removing such as machine room under the viaduct which is difficult to remove. In this paper, the concept of the side retrofitting method was described and the design methods were determined using the test results. Additional beam tests to examine anchor bar volume to ensure the flexural reinforcing effect were carried out using RC beam specimens which two-sides of the existing beam member were retrofitted by fixing RC reinforcing beam members with anchor bars. Construction methods of the side retrofitting method were also described in this paper. Finally, two practical applications to RC bridge pier structures of the Shinkan-sen which under viaduct are used for machine rooms were presented, and the effects of side retrofitting method applied to such piers with machine room under viaduct were examined in terms of seismic capacity, work period and construction cost.
