Performance of an RC Corner Beam-Column Joint Severely Damaged Under Bidirectional Loading and Rehabilitated With FRP Composites

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Title: Performance of an RC Corner Beam-Column Joint Severely Damaged Under Bidirectional Loading and Rehabilitated With FRP Composites

Author(s): Murat Engindeniz, Lawrence F. Kahn, and Abdul-Hamid Zureick

Publication: Special Publication

Volume: 258

Issue:

Appears on pages(s): 19-36

Keywords: beam-column joints; fiber-reinforced polymer; repair; strengthening

Date: 12/1/2008

Abstract:
This paper presents the performance of a full-scale reinforced concrete cor¬ner beam-column-slab specimen that was first severely damaged under bidirectional quasi-static loading, then rehabilitated and retested. The specimen was built using the pre-1970s construction practices including the use of low-strength materials ( =3000 psi [21 MPa], Grade 40 reinforcing bars) and deficiencies in reinforcement detailing. The rehabilitation process consisted of: (1) epoxy injection, (2) addition of a bar within the clear cover of the column at the inside corner, and (3) external application of a multilayer composite system made of unidirectional carbon-epoxy layers placed at different orienta¬tions. The carbon fiber-reinforced polymeric system was heat-cured at a temperature of 80°±10°C (176°±18°F) for 6 hours. The performance was evaluated both before and after rehabilitation based on the progression of damage and the hysteretic behavior including the changes in the strength, stiffness, and energy dissipation characteristics. The results indicated that even a severely damaged corner joint can be effectively rehabilitated using CFRP to achieve a ductile beam failure mechanism. The joint was upgraded to withstand story drift ratios of up to 3.7% applied simultaneously in both directions.