Interaction Between Bond at Beam Bars and Shear Reinforcement in R/C Interior Joints

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Title: Interaction Between Bond at Beam Bars and Shear Reinforcement in R/C Interior Joints

Author(s): T. Ichinose

Publication: Special Publication

Volume: 123

Issue:

Appears on pages(s): 379-400

Keywords: anchorage (structural); beams (supports); columns (supports); bond (concrete to reinforcement); joints (junctions); reinforced concrete; reinforcing steels; shear properties; Structural Research

Date: 1/1/1991

Abstract:
A set of shear-resistant actions is presented to analyze reinforced concrete interior beam-column joints in weak beam-strong column ductile frames. The proposed analysis explains the results of experiments of beam-column joints with and without bond at beam bars and with various horizontal shear reinforcement. Local bond strength at beam bars affects horizontal hoop stress. Under or up to the limit of enough bond, larger local bond strength demands larger horizontal hoop stress. Over this limit, larger local bond strength demands smaller horizontal hoop stress. Joint shear reinforcement improves anchorage of beam bars because horizontal hoop stress guarantees bond stress outside diagonal strut. This results in smaller compressive stresses of joint concrete, preventing compressive shear failure.