Nonlinear Full Range Analysis Of Special-shaped Concrete Reinforced Columns

Lightweight framed structures with special-shaped R.C. columns are applied more and more widely in recent years. The content of the paper is nonlinear analysis of complete response process for T, L-shaped and "+" shaped section R.C. columns under axial compression and biaxial bending. On the basis of related papers, the full path of stress-strain relation of concrete and the sliding of longitudinal reinforcement anchoring are all considered, simultaneously, the restriction effect for concrete by thickening of stirrups is also included. According to generating finite element model by meshing for special-shaped section columns, a computer program using the digital iteration method for full range analysis of special-shaped columns is complied. By the analytical results, 'M-φ"' related curves are obtained, at the same time, differences of ductile behavior, and bearing capacity are analyzed.At last this paper also analyses special-shaped section columns subjected to biaxially eccentric loading using finite element program ANSYS5.7. According to comparing of analytical results, the ductile behavior of R.C. T, L -shaped and "+"shaped columns are investigated. The reliability of analytical program compiled in the paper is verified.