Seismic Rehabilitation of Reinforced Concrete Joints by Epoxy Pressure Injection Technique

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Title: Seismic Rehabilitation of Reinforced Concrete Joints by Epoxy Pressure Injection Technique

Author(s): A. Filiatrault and Isabelle Lebrun

Publication: Special Publication

Volume: 160

Issue:

Appears on pages(s): 73-92

Keywords: beams (supports); columns (supports); earthquakes; epoxy resins; joints (junctions); reinforced concrete; repairs; Construction

Date: 6/1/1996

Abstract:
The use of the epoxy pressure injection technique to rehabilitate reinforced concrete beam-column joints damaged by earthquakes was investigated experimentally. Two full-scale exterior beam-column joint specimens were submitted to reverse cyclic pseudo-static displacements. The first specimen was typical of existing structures built in the fifties and sixties, in which the special seismic recommendations related to the spacing of lateral reinforcement in the beam, column, and joint were ignored. The second specimen was typical of new structures and incorporated full seismic details as prescribed in current building codes. The specimens were then repaired with an epoxy pressure injection technique. The repaired specimens were subjected to the same displacement history as that imposed on the original specimens. The results indicate that epoxy pressure injection was effective in restoring the strength, stiffness, and energy dissipation capacity of the specimens. For the specimen representing an older design, the strength and energy dissipation of the repaired assembly were increased as a result of the epoxy injection repair.