DETERIORATION MECHANISM OF SHEAR-RESISTING SYSTEM INRC BEAM SUBJECTED TO REVERSED CYCLIC LOADINGAFTER FLEXURAL YIELDING

摘要

Based on cyclic loading tests of RC beams which failed in flexural shear failure without yielding of thetransverse reinforcement, the following flexural shear failure mechanism, which is associated with 'ErrorCatastrophe' known as a theory of aging, was observed in the hinge region.A shear-resisting system formed in the hinge region of RC beam subjected to monotonic loading. Underreversed cyclic loading, the shear-resisting system of monotonic loading repeated temporarydisappearance and rebuilding due to opening and closing of cracks, each time the loading direction wasreversed. The flexural shear failure occurred due to malfunction of the rebuilding after the temporarydisappearance. What inhibited the rebuilding and caused the malfunction was errors in the rebuilding. Theerrors accumulated each time the shear-resisting system is rebuilt, and when the errors exceeded a certaintolerance, the failure due to the malfunction of the rebuilding occurred.