1999 Volume 1999 Issue 620 Pages 159-173
Many RC structures were damaged in the event of Hyogo-Nanbu Earthquake due to the malfunction of anchorage for the hoop reinforcement. It would be rather difficult to construct anchorage along with the design and construction specification of JSCE. Thus, lap joints and right-angle hooks have been found in many cases. As to the hooks, structural stability can not be clarified after peeling off of cover concrete. On the other side, RC columns tend to be influenced of bi-axial bending in the event of earthquake. When square sections have load reversal and bi-axial bending, concrete in their corners is collapsed and there is possibility of decreasing strength as hoop even through sharp-angle hook is employed. This study describes new type of anchorage by use of pins for conventional lap joints and right-angle hooks. According to the test results, it is clarified that even if the lap joints or right-angle hooks are applied to the anchorage of hoop, the concrete columns behavior is more ductile with this new reinforcing method.
