Title: Cyclic Behavior of Epoxy-Repaired Reinforced Concrete Beam-Column Joints

Author(s): Moshe A. Adin, David Z. Yankelevsky, and Daniel N. Farhey

Publication: Structural Journal

Volume: 90

Issue: 2

Appears on pages(s): 170-179

Keywords: buildings; collapse; columns (supports); connections; earthquakes; beam-column frame; damage; epoxy resins; failure; frames; joints (junctions); moments; reinforced concrete; repairs; tests; Structural Research

DOI: 10.14359/4123

Date: 3/1/1993

Abstract:
The results of laboratory tests on four isolated and simplified reinforced concrete beam-column joints, carrying quasi-static, cyclic horizontal loadings, are presented. The specimens were subjected to controlled deterioration in the first stage. Subsequently, they were thin steel-plate enveloped, sealed, and epoxy injected. The epoxy was used to fill concrete cracks, to restore bond between deteriorated surrounding concrete, and to glue the steel plates, which are used as external reinforcement instead of the lost or damaged full reinforcement. Two types of steel plates represented two- and three-dimensional joint repair. Eventually, the repaired specimens were retested under similar loadings in the second stage. Comparison between the response of the specimens before and after repair clearly indicates considerable increase in initial stiffness, general yield resistance, envelope stiffness, and ultimate resistance with energy-dissipation capacity. The repair technique was found to be efficient for mass repair or upgrading of structures not suitably designed to withstand earthquakes.