SEISMIC RETROFITTING STEEL BRACE WHICH USES POST-INSTALLED ANCHOR TOGETHER WITH EPOXY RESIN FOR RC STRUCTURES WITH LOW-STRENGTH CONCRETE

Abstract

Seismic retrofitting with steel brace is widely-spread for the seismic retrofitting of existing RC buildings. However, there has been no study that tried to apply this seismic retrofit method to existing RC buildings with very low-strength concrete. In this research, we confirmed the effect of seismic retrofitting steel brace which used post-installed anchor together with epoxy resin for RC structures with low-strength concrete through the structural tests of two series. As the beginning, we confirmed the shear strength of the indirect connection in which existing RC frame is tied to frame of steel brace. Next, we confirmed the mechanical behavior of RC frame retrofitted with steel brace subjected to axial and horizontal loads. From the structural tests, it was shown that ultimate strength of the indirect connection and RC frame retrofitted with steel brace can be estimated by the current evaluation method. In addition, it made clear that ductility index F of RC frame retrofitted with steel brace can be 2.0.