Development of clt panels bond-in method for seismic retrofitting of RC frame structure

Abstract

The new type of seismic retrofit method using CLT panels as shear walls is proposed. In this method, setting small CLT panels in RC frame and bonding each panel and panel to RC frame with epoxy resin, panels compose shear walls in dry construction method. This paper reports the shear tests of 1/3 scale specimens for 5 reinforced types. Element tests of materials and joints used in these specimens were also conducted. A ductile load-slip behavior was observed even after failure of bonding joint in every specimen. The stress analysis showed that the bond strength between CLT and RC and shear modulus of CLT in these specimens match the result of element tests. This indicates the specimen strength could be divided into the RC frame strength and the CLT strength at the initial stage. As the bond strength between CLT and RC was smaller than the shear strength of CLT, the specimens can be stronger by increasing the adhesive area.