Annual Conference of the Canadian Society for Civil Engineering 2013: Know-How - Savoir-Faire, May 29-June 1 2013, Montreal, QC, Canada
The quasi-static and the low frequency cyclic loading-to-failure tests have shown that the stiffness degradation and strength of RC columns are reduced in a staged pattern. Although several studies have demonstrated this strength and stiffness degradation using complicated high-level 2D and 3D modeling approaches, a simplified numerical approach is required. Simplified non-linear finite element model developed by the authors is used in this paper to capture the staged damage and collapse of RC columns subjected to extreme loads. The model performs inelastic sectional and element analysis phases considering the instantaneous and successive changes of the sectional and element properties throughout the progress of the loading steps and the critical stages of corrosion-induced damages. The model considers all possible state of strain distributions on a concrete beam-column, and the nonlinear instantaneous sectional properties and the internal forces are calculated ensuring the equilibrium of all the internal and external forces in the section level. It is found that the proposed simplified nonlinear finite element model is numerically stable in all cases of strain distributions, both in static and dynamic analysis. The model shows that the load displacement curve of the columns subjected to quasi-static loading or the envelop of the load-displacement hysteretic relationship can be found using quasi-static analysis. The model can predict the nonlinear behavior of non-corroded and corroded specimens with high accuracy. Further research is required to accurately define the critical stages of damages incorporating field and experimental data of damaged RC columns and higher level non-linear finite element techniques.
Canadian Society for Civil Engineering
Annual Conference of the Canadian Society for Civil Engineering 2013: Know-How - Savoir-Faire5, no. January: 4339–4348.