Simulations on progressive collapse resistance of steel moment frames under localized fire

• Published in: Journal of constructional steel research Vol. 138; pp. 380 - 388
• Main Authors: Jiang, Binhui, Li, Guo-Qiang, Li, Liulian, Izzuddin, B.A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2017
• Subjects: Dynamic effect; Fire; Progressive collapse; Simulation; Steel frame; Progressive collapse; Steel frame; Simulation; Fire; Dynamic effect
• ISSN: 0143-974X; 1873-5983
• DOI: 10.1016/j.jcsr.2017.05.018

Based on three steel frame tests conducted by the authors, which explicitly considered dynamic effect caused by column buckling, numerical models were developed to analyse the progressive collapse resistance of steel moment frames under a localized fire. Besides, the effects of damping and strain rate were studied, and the progressive collapse modes of the test frames were studied through amplifying the load applied to the frames. The analysis results match well with test data and show that the influence of damping on progressive collapse of steel frames under a localized fire is negligible in the range of damping ratio from 0 to 10%. However, the effect of strain rate on the structural performance of steel frames under a fire is significant for the cases involving dynamic buckling of the heated column. Besides, the strain rate effect in the heated columns is significant but is negligible in other parts of the test frames. The successful validation of the numerical models paves the way for their application in parametric studies aimed at improved guidance of structural robustness under localized fire conditions. •A detailed numerical model was developed to simulate the progressive collapse resistance of steel moment frames under localized fire.•Results of the developed numerical model match well with tests results those explicitly considered dynamic effects caused by column buckling under fire.•Damping, in range of damping ratio from 0 to 10%, has little effects on the performance of the test frames under localized fire.•The strain rate effect has little influence on structural performance before the buckling of the heated column, but has significant influence on the procedure of buckling.•The strain rate effect in the heated column is significant while it is negligible in other unheated parts of the frame.