Analytical behavior of eccentrically loaded concrete encased steel columns subjected to standard fire including cooling phase

摘要: A nonlinear 3-D finite element analysis (FEA) model was developed to predict the behavior of eccentrically loaded concrete encased steel (CES) columns subjected ISO-834 standard fire including heating and cooling phases. The has been validated against published tests conducted at elevated temperatures. Comparisons between predicted results test show that this can accurately CES under fire. FEA then used investigate typical temperature-time curve mid-height lateral deformation-time eccentric compression in a complete loading history initial loading, cooling. It is shown temperature delay obvious inner layers concrete. resistance column should be checked for full process exposure until temperatures everywhere start decrease. deformation still gradually increases during phase may fail phase. There large residual after exposure. Furthermore, variables influence were investigated parametric studies. found main parameters which are load ratio, slenderness duration time, depth width ratio cross-sectional ratio.