| In contrast with the work reported on the shear behavior which could be described in a correlation equation of ellipse of reinforced concrete columns with the same area of stirrups in directions corresponding to the principal axes of the rectangle section under bilateral horizontal loads, the behavior of reinforced concrete columns with different area of stirrups in both principal directions has received little attention.In this paper, Firstly,the shear behavior and mechanism of damage of reinforced concrete columns with different area of stirrups in both directions were studied both experimentally and analytically. Secondly, In order to research seismic behavior of reinforced concrete columns, the shear strength of rectangular section reinforced concrete columns with different area of stirrups in two directions under lateral bevel load is investigated by nonlinear finite element method.The results of nonlinear analysis are compared with the results of experiment, and the correlation equation of bilateral shear strength of reinforced concrete frame columns under static load and low-reversed cyclic load is analyzed.Then, a new design method is also presented.It is show that the influences of the lateral bevel load on the shear strength of rectangular section reinforced concrete columns with different area of stirrups in two directions accord with the ellipse law, which may be served as reference for the design of shear strength of reinforced concrete columns with different area of stirrups in two directions.Lastly, the main influence factors,which affect the shear strength of bilateral shear reinforced concrete columns, are analyzed with grey-correlation method.The analysis result shows that:the influence degree on shear strength is reduced in turn with the concrete strength, the ratio of shear span to depth, the product of stirrup ratio and stirrup stength, the ratio of longitudinal reinforcement, the axial compression ratio, the load inclination.
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