Experimental Research And Theoretical Analysis Method On Shear Capacity Of PVA-FRC Diagonally Reinforced Coupling Beams Of Small Span-to-depth Ratio

The shear bending of general reinforced coupling beams of small span-to-depthratio is relatively large, the ductility and energy dissipation is poor, and cannot providesufficient bearing capacity, ductility and energy dissipation in structures. PVA-FRC is akind of material with high ductility, with superior energy absorption capacity and crackcontrol ability, which can enhance the ability of coupling beams include bearingcapacity, ductility and energy dissipation capacity. In order to get a better couplingbeam with a simple design,convenient construction scheme and economic and reachthe demand of structure.Experimental study in this paper will use the PolyvinylAlcohol-Engineering Fiber Reinforced Cementitious Composites (PVA-FRC）andadding diagonal reinforcement design at the same time,which applied to the couplingbeams with small Span-to-Depth ratio,completed the quasi-static test of4PolyvinylAlcohol-Engineering fiber reinforced Cementitious Composites diagonally reinforcedcoupling beams with small span-to-depth ratio and1ordinary concrete diagonallyreinforced coupling beams with small span-to-depth ratio.Interaction PVA-FRC anddiagonal reinforcement design effect on beam crack and failure modes of the newtypical coupling beams, analysis the failure process, failure mode, bearing capacity,deformation and energy dissipation capacity.Then, On the basis of mechanics characteristics of PVA-FRC diagonallyreinforced coupling beams with small span-to-depth, the softening strut-and-tie modelmethod on shear capacity to simulate PVA-FRC diagonally reinforced coupling beamsfor the span-to-depth ratio of less than or equal to1.5is proposed, equilibrium equation, physical constitutive equation, deformation coordination equation and derived theformula for calculating the inclined section of shear capacity of PVA-FRC diagonallyreinforced coupling beams with the span-to-depth ratio are established, and the detailedcalculating steps is proposed.