TY - JOUR A1 - Talebi, Elnaz A1 - Korzen, Manfred A1 - Hothan, Sascha T1 - The performance of concrete filled steel tube columns under postearthquake fires JF - Journal of Constructional Steel Research N2 - In this study, a nonlinear three-dimensional finite element (FE) model was developed and validated to investigate the response of concrete filled tube (CFT) columns subjected to post-earthquake fires. Three steps were considered successively in the modelling, namely, cyclic, thermal and structural analyses. Outputs from the cyclic loading including residual deformationswere imposed as an initial condition to the thermal-stress model, imitating the seismic response of the column. Subsequently, a nonlinear sequentially thermal-stress analysis was conducted to simulate the fire response of column after the earthquake. The proposed FE model was validated by comparing the simulation resultswith the observations of full-scale fire and cyclic tests available in the literature. The validated numericalmodelwas then used to study the behavior of CFT columns under the combined action of earthquake and fire as a multi-hazard event. Three probable seismic damage scenarios were considered in the column, namely, middle length, bottom and top end region damages. The level of damage was assumed as a high damage level, presuming that the column reached 50% of its lateral resistance while still maintaining ist overall stability after the earthquake. The results showed that the top and bottom end region damages have not significantly influence the fire response of the damaged column. Besides, the column with the middle span damage performed a lesser fire resistance time owing to the coincidence of damage location to that of onset of global buckling. KW - Post-earthquake fire KW - Concrete filled tube (CFT) column KW - Finite element analysis KW - Seismically damaged column KW - Fire resistance KW - Multi-hazard incident PY - 2018 DO - https://doi.org/10.1016/j.jcsr.2018.07.013 SN - 0143-974X VL - 150 SP - 115 EP - 128 PB - Elsevier Ltd. AN - OPUS4-45813 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -