DESIGN OF CARBON FIBER-ANCHORS APPLIED FOR SEISMIC RETROFITTING WITH CARBON FIBER SHEETS

摘要

Adhering carbon fiber (CF) sheets onto RC piers is one of the effective seismic strengthening methods. When the pier has an irregular shape such as I-shaped cross section, CF sheets cannot be adhered continuously around the pier. In such cases, the edge of the CF sheets have to be fixed with steel angles and anchor bolts in conventional fixing method. Therefore, an alternative fixing method using CF-anchors consisted of bundles of CF strands and fan shaped was developed and practically applied. One end of the CF-anchor spreaded like a fan was adhered to the CF sheet and other end is embedded in a hole drilled in the concrete member and fixed with injected epoxy resin. Applying this CF-anchor for the reinforcement of the concrete piers, it is necessary to design the adhesive load of the adhered part and the pull-out load of the embedded CF-anchor corresponding to the amount of the CF sheets. This paper describes the design of CF-anchors based on the experimental results for the adhesive load of the adhered part and the pull-out load of the embedded CF-anchor.