Abstract

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Title:: Analysis of Load-deformation of Reinforced Concrete Columns Based on Simplified Modified Compression Field Theory

Author(s):: QIU Jian-lei; GONG Jin-xin; School of Civil Engineering, Dalian University of Technology

Keywords:: reinforced concrete column; loaddeformation; modified compression field theory; skeleton curve

Abstract:: The shear mechanism of reinforced concrete columns was analyzed based on simplified modified compression field theory. Considering the effect of expansion of core concrete on the shear capacity contribution of stirrups, the shear capacity contribution of aggregate interlock behavior and compressive zone were calculated. The shear strengths of tensile area and compressive area were obtained, and the calculation method of shear strength of column after stirrups yielded was established. Combined with the conventional section fiber analysis method, while three deformation components of bending deformation, shear deformation and slip deformation were introduced, the bending analysis of columns before stirrups yielded was carried out, the loaddeformation curves of reinforced concrete columns under compression bending shear action were obtained, and compared with the low cycle test results of 15 reinforced concrete columns collected. The results show that the loaddeformation curves calculated by the proposed method agree well with the test loaddeformation skeleton curves, and have better analysis effect on the reinforced concrete columns with flexural failure, bending shear failure and shear failure. The proposed method can be used for loaddeformation analysis of reinforced concrete columns under compression bending shear action.