Deterioration Mechanism of Shear-Resisting System in RC Beam Subjected to Reversed Cyclic Loading after Flexural Yielding

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Title: Deterioration Mechanism of Shear-Resisting System in RC Beam Subjected to Reversed Cyclic Loading after Flexural Yielding

Author(s): H. Kinugasa and S. Nomura

Publication: Special Publication

Volume: 237

Issue:

Appears on pages(s): 1-14

Keywords: ductility; error catastrophe; failure mechanism; flexural shear failure; RC beam; reversed cyclic loading; shear-resisting system

Date: 8/1/2006

Abstract:
Based on cyclic tests of RC beams that failed in flexural-shear without yielding of the transverse reinforcement, a mechanism controlling flexural shear failure is proposed. This mechanism, which is associated with ‘Error Catastrophe’ known as a theory of aging, was observed in the hinge region of the beams. The results of experimental testing indicate that a shear-resisting system forms in the flexural hinge region of a RC beam subjected to monotonic loading. Under reversed cyclic loading, the shear-resisting system temporarily disappears as cracks open and then is rebuilt as cracks close. A flexural shear failure occurs when the shear resisting mechanism is not rebuilt upon load reversal. What inhibits the rebuilding process and, ultimately, results in a failure to rebuild, is “errors” in the rebuilding process. These errors accumulate each time the shear-resisting system is rebuilt, and when the errors exceeded a certain tolerance, failure due to the malfunction of the rebuilding occurs.