Finite element analysis of the reinforced concrete special-shaped columns under axial force and torsion

Abstract

The finite element analysis software ANSYS is used to analyze 9 reinforced concrete special-shaped columns under the combined action of axial force and torque. The parameters of the numerical model are given through repeated trial calculation. The influence of different values of axial compression ratio on the torsional capacity of test specimens is studied. The results show that the prediction error of the finite element model is small, which means the model is capable of accurate simulation. But the whole process analysis of the torque-torsion angle curve needs to be improved. The cracking and ultimate torque of special-shaped columns with different sizes and section shapes increase linearly with the growth of axial compression ratio. However when the ratio exceeds 0.6, the torsional bearing capacity of the columns will decrease. The increasing of axial compression ratio will also shorten the process from cracking to ultimate torque.