Experimental Study On Seismic Perfomance Research In Flexure-Shear-Torsion Components Of Reinforced Concrete Rectngle Column

With the construction of thin wall structures and prestressed reinforced concrete members in shear and bending use heavily and reinforcement calculation is continuous improvement, distribution rebar is more in line with the actual situation, so that it is not polygamy for torsional bar, these changes make to reverse highlight.This article by4flexure-shear-torsion structure model of rectangular reinforced concrete frame columns under combined cyclic loading test studies on axial compression ratio and distribution in different rate of hoops, of rectangular reinforced concrete frame columns under torsional eccentricity of crack development law, failure mode, hysteretic behavior, skeleton curve, ability, ductility, energy consumption, such as stiffness and strength degradation.Experimental results show that the roots of four cracks first appeared in a pillar, mostly concentrated in the lower section of the Widget, with torsional eccentricity of the components angle between is20°-45°, cracking load is approximately0.2-0.3of the limit loads.The first three components are flexural-torsional-type damage, but RC-4is bending-type damage. Rectangular frame columns long load-strain curves of longitudinal reinforcement in the Middle forms a butterfly-shaped loop, indicating that the longitudinal steel should not only be to structure reinforcement effect, but also in the principal resistance to torsion. In the same torsional eccentricity, increasing axial compression ratio can reduce ductility and energy dissipation capacity of rectangular reinforced concrete frame columns and increasing the volume of hoop ratio distribution can enhance Member ductility and energy dissipation capacity, under the same action of axial compression ratios and stirrup ratio, torsional eccentricity reduces ductility and energy dissipation capacity of components. The same torsional eccentricity subjected, increasing the axial compression ratio, the hysteresis curve cycle is less curve comparison "narrow", seismic behavior and ductile performance are reduced; smaller component of axial compression ratio of the hysteresis curve is full spindle and has load cycle times and more energy capacity. With the same torsional eccentricity subjected, hoop high component of hysteresis curve is full and has more number of cycles and ductility.Energy dissipation capacity are increased degradation of bearing capacity is not obvious and has better seismic performance. In the same axis pressure and distribution hoop rate role Xia, existing reverse eccentric from of bent twist widget delay back curve is more "narrow", fell segment is more steep, load contains role cycle number and ductility is reduced, stiffness degradation is more fast.