الفهرس | Only 14 pages are availabe for public view |
Abstract In the present research, an analytical model is introduced to study the nonlinear behavior of reinforced concrete sections subjected to axial forces and bending moments. This model predicts the normal stress distribution over the cross-section after considering compatibility and equilibrium conditions!. Real stress-strain curves of concrete and reinforcing steel are considered simultaneously in the analysis. Based on finite-element method, an iterative procedure is proposed to carry out the analysis. Consequently, axial and flexural rigidities of the cross-section are obtained after reaching the equilibrium conditions. Based on matrix structural analysis, the proposed cross-sectional model is extended to the structural level in order to study the nonlinear behavior of framed structures. A computer program (NARC - Nonlinear Analysis of Reinforced Concrete structures) is written in order to carry out the analysis and achieve the research goals. The program predicts normal stress distribution on any cross-section, internal forces. deformed shapes (displacements), and axial and flexural rigidities distributions on all members of the frame. The obtained results from the proposed program are verified by comparison with analytical and experimental data of the published literature. good agreement is obtained indicating that the proposed model can reasonably predict the actual response. |