Strength of Reinforced Concrete Frame Connections Rehabilitated by Jacketing

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Title: Strength of Reinforced Concrete Frame Connections Rehabilitated by Jacketing

Author(s): Sergio M. Alcocer an James O. Jirsa

Publication: Structural Journal

Volume: 90

Issue: 3

Appears on pages(s): 249-261

Keywords: anchorage (structural); beam-column frame; beams (supports); bundled reinforcement; columns (supports); confined concrete; earthquake-resistant structures; reinforced concrete; repairs; slabs; strength; structural design; Structural Research

Date: 5/1/1993

Abstract:
The suitability of jacketing nonductile frame elements as a rehabilitation technique was assessed experimentally. The research was aimed at studying the shear strength performance of jacketed joints. Four large-scale beam column connections were rehabilitated and tested under bidirectional cyclic loading. The variables included jacketing of columns only or both columns and beams, damage or no damage prior to jacketing, and the layout of the jacketed column longitudinal reinforcement. Test results indicated that the shear strength of jacketed joints can be estimated using current recommendations for design of beam column joints in new construction. Results also showed that the criterion on bar development of current recommendations should be fulfilled by longitudinal reinforcement in the jackets.