NONLINEAR THREE-DIMENSIONAL FE SOLID RESPONSE ANALYSIS OF RC COLUMNS SUBJECTED TO COMBINED PERMANENT ECCENTRIC AXIAL FORCE AND REVERCED CYCLIC TORSION AND BENDING/SHEAR

Abstract

The response behaviors of RC solid columns subjected to the combined permanent axial force, the reversed cyclic torsion and bending/shear force were investigated with the nonlinear 3D FE analysis to verify the 3D multi-directional constitutive models considering non-orthogonal cracking. It was recognized that this analytical method could pursue the situation multi-directional cracks were introduced at the 3D space, and the modeling of spalling and buckling under torsion, bending and shear became important in the high inelastic range. A primitive analysis covering the large deformation of main reinforcement was also simultaneously conducted. The visual comprehension that predominant 3D variable inclined cracks had changed step by step could be obtained through the analysis.