摘要
角钢是高耸大跨钢结构体系的重要组成构件,为研究不同宽厚比角钢的抗爆性能,首先通过对9根三组宽厚比等边角钢试件进行爆炸试验,观察爆炸冲击作用下角钢的毁伤变形特征,研究不同宽厚比角钢的失效模式;然后,分析爆炸冲击作用下各宽厚比角钢迎爆面超压时程曲线的变化特征,研究超压峰值、爆炸冲量及爆炸冲击相关时间参数的变化规律。最后,利用流固耦合模型对爆炸冲击作用下角钢变形和迎爆面超压时程进行数值模拟,与试验结果相对比,分析宽厚比对角钢抗爆性能的影响规律。结果表明,角钢在爆炸冲击作用下的失效模式为局部屈曲,爆炸毁伤破坏程度随宽厚比增加而增大;迎爆面各测点超压峰值和爆炸冲量均随宽厚比增加而增大。
Angle steel is an important component of high-rise and large-span steel structural system.The explosion test was conducted on three groups of nine equal-angle steel members with different width-thickness ratios firstly,in order to study the anti-explosion performance of angle steel with different width-thickness ratios.The damage deformation characteristics of angle steel under the impact of explosion were observed,and the failure modes of angle steel with different width-thickness ratios were studied.Then,the change characteristics of overpressure time-history curve of the blasting surface of angle steels with different width-thickness ratios under the action of explosion shocks were analyzed,and the change rules of overpressure peak value,explosion impulse and explosion shock related to time parameters were studied.Finally,the deformation of angle steel and the time-history of overpressure on the blasting surface were simulated by using the fluid structure coupling model.Compared with the test results,the influence of width-thickness ratio on the anti-explosion performance of angle steel was analyzed.The results show that the failure mode of angle steel under the impact of explosion shock is local buckling,and the damage degree of explosion increases with the increase of width-thickness ratio;the peak value of overpressure and the explosive impulse of each measuring point on the blasting surface increase with the increase of width-thickness ratio.
作者
张春涛
马建超
肖正直
Zhang Chuntao;Ma Jianchao;Xiao Zhengzhi(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
出处
《建筑结构》
CSCD
北大核心
2019年第23期88-96,共9页
Building Structure
基金
国家自然科学基金资助项目(51508482)
四川省教育厅项目(15ZB0112)
绵阳市科技计划项目(14G-03-8)
关键词
宽厚比
爆炸冲击
毁伤变形
超压时程曲线
数值模拟
width-thickness ratio
explosion shock
damage deformation
overpressure time-history curve
numerical simulation
