Bond and Anchorage of Bars in Reinforced Concrete Beam-Column Joints


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Title: Bond and Anchorage of Bars in Reinforced Concrete Beam-Column Joints

Author(s): T. Kaku and H. Asakusa

Publication: Special Publication

Volume: 123


Appears on pages(s): 401-424

Keywords: anchorage (structural); axial loads; beams (supports); bond (concrete to reinforcement); columns (supports); deterioration; joints (junctions); reinforcing concrete; reinforcing steels; Structural Research

Date: 1/1/1991

Bond and/or anchorage performances of longitudinal bars in reinforced concrete beam-column joints were outlined, based on the investigations performed in the United States, New Zealand, and Japan in the past 10 years. The effects of joint size-bar diameter ratio, development length, geometry of bent bar, column axial force, and transverse reinforcement were discussed. The bond deterioration caused such undesirable phenomena as pinching in force-story drift hysteresis curves, increasing the slip deformation at the beam-column interface, changing the shear transfer mechanism in the joint core, and decreasing the flexural strength of the adjoining members. Bars passing through an interior joint and bent bars in an exterior joint were treated separately to make the discussion clear.