Damage evaluation of a restrained steel column subjected to indoor blast and fire

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 79-86.

DING Yang1,2,CHEN Ye1,SHI Yanchao1,2

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Abstract

The restraint stiffness and additional mass provided by a structural system obviously influence the dynamic response of a steel column under blast,while the additional arial force induced by the restrained thermal expansion makes the capacity of restrained steel column different from that of a non-restrained column in fire.Here,Johnson-Cock damage model was used to analyze the damage of a restrained steel column under indoor blast,and the pressure-impulse-time curred surface plot and expression were established to evaluate
the failure of the restrained steel column under blast and fire.To investigate the effect of restraint,the failure time of a non-restrained steel column under blast and fire was compared with that of the same column restrained.Furthermore,the parametric analysis were performed to study the effect of pressure time curved shape,restraint stiffness and geometric size on the P-I-t curved surface plot.The results showed that the failure time of the restrained steel column is earlier than that of the non-restrained steel column when the blast load intensity is smaller,while the former is later than the latter when the blast load intensity is larger; the bigger the shape parameters of pressure time history curve,the easier the restrained steel column failure; the effect of restraint stiffness on the failure time of the column can be neglected; the column wall thickness has a slight influence on the failure time when the blast induced damage is smaller,while the column with a thicker wall becomes weaker when the damage is larger; however,in the P-I-t space,the smaller the wall thickness of the column,the easier the failure of the higher column.

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blast / fire / restrained steel column / damage evaluation / parametric analysis

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DING Yang1,2,CHEN Ye1,SHI Yanchao1,2. Damage evaluation of a restrained steel column subjected to indoor blast and fire[J]. Journal of Vibration and Shock, 2017, 36(5): 79-86

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