Enhancing Seismic Performance through Rehabilitation: Analysis of Beam-Column Connections

Abstract

This study focuses on the rehabilitation of beam-column connections weakened in flexure to restore their original seismic capacity. Two distinct repair approaches were deployed based on the severity of damage. For partial damage, involving loose concrete, compromised material was replaced with micro-concrete, followed by epoxy injection. In cases of severe damage, complete replacement of damaged concrete preceded epoxy injection. Voids created were filled with micro-concrete, and a bonding agent ensured strong adhesion. Epoxy was injected into drilled holes under high pressure. After a 7-day curing period, specimens were tested under various loading conditions. Data on crack location, pattern, and width were meticulously recorded. Post-processing analysis evaluated seismic capacity parameters and compared the effectiveness of repair techniques. The rehabilitation successfully restored seismic performance, enhancing ultimate strength, stiffness, energy dissipation, and ductility.