Anchorage of Beam Bars with 90-deg Bend in Reinforced Concrete Beam-Column Joints

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Title: Anchorage of Beam Bars with 90-deg Bend in Reinforced Concrete Beam-Column Joints

Author(s): O. Joh, Y. Goto, and T. Shibata

Publication: Special Publication

Volume: 157

Issue:

Appears on pages(s): 97-116

Keywords: anchorage (structural); axial loads; beam column frame; beams (supports); compressive strength; cover; failure; pullout tests; reinforced concrete; strength; stresses; tensile strength; tests; Structural Research

Date: 10/1/1995

Abstract:
Based on the authors' previous tests, failure modes of beam bar anchorage with 90-degree bend used in reinforced concrete beam-column joints were classified into three types: a side split failure, a local compression failure, and a raking-out failure. To clarify the raking-out failure, the least understood of the modes, column type specimens with beam bars with 90-degree bend in the beam-column joints were tested under pullout loading at the bars. The specimen variables were development length, column depth, lateral reinforcement ratio, spacing between beam bars, and concrete compressive strength. From the test results, influence factors on the raking-out failure mode were discussed and an equation evaluating anchorage strength proposed.