Nonlinear analysis of slender high-strength R/C columns under combined biaxial bending and axial compression

A numerical technique for the analysis of high-strength reinforced concrete slender columns subjected to end loadings is presented. The finite difference method is applied to calculate the load corresponding to a specified deflection, considering both material and geometric nonlinearities. In this way, the complete load–deflection curve was computed for X columns that were also tested experimentally. The analysis procedure is applicable for columns with hinged extremities, although only isolated columns are evaluated herein.

► 3D nonlinear analysis of high-strength R/C slender columns is presented.
► The numerical solutions can accurately predict the curvature and the deflection.
► The numerical results proved a good coincidence with the experimental results.