室内爆炸与火灾联合作用下约束钢柱损伤评估

丁 阳1,2,陈 晔1,师燕超1,2

振动与冲击 ›› 2017, Vol. 36 ›› Issue (5) : 79-86.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (5) : 79-86.
论文

室内爆炸与火灾联合作用下约束钢柱损伤评估

  • 丁  阳1,2,陈  晔1,师燕超1,2
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Damage evaluation of a restrained steel column subjected to indoor blast and fire

  • DING Yang1,2,CHEN Ye1,SHI Yanchao1,2
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摘要

结构体系提供的约束刚度和附加质量会显著影响钢柱在爆炸下的动力响应,同时火灾下结构对热膨胀的约束会导致钢柱内产生附加轴力,受力特性与无约束柱明显不同。本文采用引入损伤的Johnson-Cock强度模型分析了约束钢柱在室内爆炸荷载作用下的损伤情况,建立了评估约束钢柱在爆炸与火灾联合作用下破坏情况的压力-冲量-时间曲面图及表达式。为了说明结构约束的影响,将计算结果与无约束钢柱在爆炸与火灾联合作用下的破坏时间进行对比,并进一步分析了超压时程曲线形状、约束刚度及钢柱几何尺寸对P-I-t曲面图的影响。结果表明,当爆炸荷载强度较小时,约束钢柱的破坏时间早于无约束钢柱,当爆炸荷载强度较大时,约束钢柱的破坏时间晚于无约束钢柱;超压时程曲线形状参数越大,约束钢柱在爆炸作用下越易破坏;约束刚度对钢柱在爆炸与火灾联合作用下的破坏时间基本无影响;当爆炸损伤较小时,钢柱壁厚对破坏时间影响很小,当爆炸损伤较大时,钢柱壁厚度越大,钢柱越易破坏,但在压力-冲量-时间空间中,仍为壁厚越小、柱高越高的钢柱越易破坏。   

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.

关键词

爆炸 / 火灾 / 约束钢柱 / 损伤评估 / 参数分析

Key words

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

引用本文

导出引用
丁 阳1,2,陈 晔1,师燕超1,2. 室内爆炸与火灾联合作用下约束钢柱损伤评估[J]. 振动与冲击, 2017, 36(5): 79-86
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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