高温与爆炸作用下轻钢柱动力响应与破坏模式数值分析  

Numerical analysis on dynamic response and failure mode of light steel column under elevated temperature and blast loading

作　　者：阎石[1] 齐宝欣[1,2] 辛志强[1] 刘蕾[1] 李鹏[1] 李晓杰[2] 

机构地区：[1]沈阳建筑大学,辽宁沈阳110168 [2]大连理工大学,辽宁大连116024

出　　处：《土木工程学报》2010年第S1期484-489,共6页China Civil Engineering Journal

基　　金：爆炸科学与技术国家重点实验室(北京理工大学)开放基金(KFJJ10-14M)

摘　　要：采用有限元数值分析方法,研究高温与爆炸荷载联合作用下轻钢结构柱的动力响应与破坏模式规律,在分析中考虑不同火灾温度与不同爆炸冲击荷载峰值,以及在相同爆炸荷载峰值下不同冲击荷载峰值出现时间等参数的影响。通过有限元软件ANSYS/LS-DYNA建立实体轻钢柱模型,根据欧洲规范3建议的升温曲线及不同温度条件下材料性能参数,确定钢材的弹性模量、剪切模量、屈服强度等参数。选定在特定温度点对钢柱施加爆炸荷载,分析时考虑应变率效应。数值分析结果表明:相同爆炸荷载作用下随着火灾过程中温度的升高,轻钢柱跨中变形增大,轻钢柱的损伤更明显;相同爆炸荷载峰值作用下爆炸荷载峰值出现时间越小,轻钢柱跨中变形越大;在高温下发生爆炸轻钢柱的变形要比常温的明显,由于高温使轻钢柱的材料性能急剧降低,使高温和爆炸荷载作用下的轻钢柱破坏模式明显不同于常温下的破坏模式。Numerical analysis is performed to study the dynamic responses and the failure mode of the light steel structural column caused by fire and blast loading.The influences of the different temperatures,the different peak of blast impact load,and the same of the peak of blast loading with different peak time are considered in the paper.The dynamic finite element software ANSYS/LS-DYNA is used for the numerical simulation and establishment for the solid model of the light steel column.According to the European standard 3 under the fire with the rise of temperatures,steel elastic modulus,shear modulus,yield strength are reduced.Some specific temperatures are selected to numerically analyze for the steel column under blast loading,considering strain rate effect during the simulation.The numerical results indicate: the deformation of the mid-span of the steel column under the same blast loading is increased and the damage is obvious as the temperature is rising.The deformation of the mid-span of the steel column under the same blast loading is also increased as the peak blast occurs early.The deformation of the steel column is more obvious at the elevated temperature than at the normal temperature,the failure modes of the steel column under the blast loading at elevated temperature are obviously different to that at low temperature.

关 键 词：轻钢柱 高温作用 爆炸荷载 动力响应 破坏模式 数值分析 

分 类 号：TU352.13[建筑科学—结构工程]