Influence of Transverse Joint and Beam Reinforcement and Relocation of Plastic Hinge Region onBeam Column Joint Stiffness Deterioration

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Title: Influence of Transverse Joint and Beam Reinforcement and Relocation of Plastic Hinge Region onBeam Column Joint Stiffness Deterioration

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

Publication: Special Publication

Volume: 123

Issue:

Appears on pages(s): 187-224

Keywords: beams (supports); columns (support); deterioration; frames; hinges (structures); joints (junctions); reinforced concrete; slippage; shear properties; tests; Structural Research

Date: 1/1/1991

Abstract:
Two series of experiments on the performance of beam-column joints in reinforced concrete frames were carried out. In Series I, the influence of the transverse reinforcement in the joint and/or the portion of the beam end connected to the column was investigated. From the test results, it is derived that heavy transverse joint reinforcement may reduce the slippage of beam bars in the joint and enhance the joint stiffness after cracking, and the similar transverse shear type reinforcement in the beam end has little effect on relieving the stiffness after degradation of a frame due to the deterioration of bond along the beam bars within the joint. In Series II, the effects of locating a plastic hinge in the beam away from the column face were examined. The test results show that the bond deterioration of beam bars within the joint may be prevented effectively by plastic hinge relocation, but shear-sliding deformation may occur at the plastic hinge away from the column face owing to the inevitable increased shear force in the beam. A new arrangement of beam bars to improve the behavior of the plastic hinge is proposed.