Study on Shear Strengthening Retrofit Using Post-Installed Shear Reinforcement with Anchor Plate at One End

Abstract

A new shear strengthening retrofit method has been developed to provide existing structures with shear reinforcement installed from one side even under constraints such as ground in full contact with the back of the structure to be reinforced. In the newly developed method, shear reinforcing bars with a hex nut provided at one end to function as an anchor plate are integrated with the existing concrete structure by use of grout designed specifically for the new method so as to improve shear capacity. Newly devised jigs for grout injection and shear reinforcing bar insertion make easy and high-quality construction possible. Loading experiment results confirmed that the new method improves shear capacity and allows the use of a shear capacity evaluation method based on conventional calculation formulas.