Abstract

In 2009, a magnitude 7.6 earthquake stroke West Sumatra, Indonesia and caused severe damage to reinforced concrete (RC) buildings. Failure of poorly-detailed joints was remarkable. In consideration of economic and technical conditions in developing countries like Indonesia, a seismic strengthening method using RC wing walls is proposed aiming to improve the moment capacity of such seismically substandard beam-column joints. In this study, three 3/4-scale substandard exterior beam-column joint specimens were prepared with the same structural details, two of which were strengthened by installing RC wing walls with different strengthening details. The test results showed that the strengthened specimens exhibited ductile failure modes with beam yielding, whereas the benchmark specimen failed at the joint showing a brittle manner. This seismic strengthening approach is applicable for improving the seismic performance of substandard RC beam-column joints.

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