Experimental Study On Seismic Behavior Of Double Coupling Beam Of High Strength Reinforced Concrete

Typically there is a problem exist in the design of coupling beam, which is thebeam section shear bearing capacity does not meet the requirements of the biggest. Inorder to solve this problem we usually reduce stiffness of coupling beam. However, inmany conditions, using the general method can’t solve the problem either. Doublecoupling beam in the aspect of improve the stress of the coupling beam has a bettereffect. Meanwhile double coupling beam can be used to increase the building space,conducive to the device pipeline layout.This article will, through the method of experiment, study on seismic behavior ofdouble coupling beam of high strength reinforced concrete. We produced twothree-layer1/4reduced scale of high strength high reinforced concrete shear wallmodel, where a model with single coupling beam, another piece of the model usingdouble coupling beam. Comparative study on carrying capacity, hysteretic behavior,ductility, energy dissipation capacity of the two piece of the model under the samelow cyclic loading test, explore the role of double coupling beam in high strength highreinforced concrete.From test to get a conclusion that, comparing with single coupling beam, doublecoupling beam intensity was reduced by20%~30%, the ductility increased by about27%, energy dissipation capacity increased by22%or so, in the elastic stage stiffnesswas reduced by30%or so. In addition, from the ultimate destruction ofmorphological point of view, single coupling beam appears very obvious shear cracksand all stirrups yield eventually shear failure; double coupling beam only appearsinclined cracks and shear cracks do not appear in the coupling beam ends, stirrups didnot yield throughout the final destruction. From this perspective, double couplingbeam can effectively reduce the internal force, a good solution to the problem that themaximum shear capacity of the beam section does not meet the requirements of thebiggest. Avoid shear failure and improve the ductility of the structure.The use of "bending stiffness equivalent" method can effectively facilitate designcalculations.