摘要
等边角钢构件因其具有受力合理、承载力高、易于安装、运输方便等优势,在高压输电塔结构中作为主要构件得到了广泛应用,研究爆炸冲击荷载作用下等边角钢构件的抗爆性能具有重要的理论意义及工程实用价值。通过静爆试验研究等边角钢构件在爆炸冲击荷载下所受到的超压荷载分布、试件损坏情况和抗爆性能。通过试验得到了角钢构件迎爆面顶部、中部、底部的超压时程曲线以及构件中部的变形形式,进一步了解爆炸冲击波的传播方式及等边角钢构件在爆炸冲击荷载作用下的受力特点。随着构件宽厚比的增大,各测点的超压峰值均呈现出上升的趋势,构件中部的残余变形迅速增大;超压峰值呈现出在起爆点与构件等高处向构件两端递减的趋势;临近场爆炸时,构件呈现出局部屈曲的破坏形态。
Equilateral-angle steel member has some advantages such as reasonable stress, high hearing capacity, easily installation, easy to transport and so on. It has been widely applied in the high voltage （HV） transmission tower structures as a major member. It＇ s of great significance and engineering value in researching the anti-explosion performance of equilateral-angle steel member under blast load. Based on the static blasting test, the paper researched the equilateral-angle steel member＇ s overpressure distribution, specimen damage and anti-explosion performance under blast-impact load. It could be obtained by test that the equilateral-angle steel member＇ s blast overpressure history curves at its bottom, middle, top and the deformation form at the middle of the member, so as to further understand the propagation way of explosion shock waves and the member＇ s mechanical characteristics. As the width-to-thickness ratio increased, the overpressure peak value of each measuring point showed an increasing trend, the member＇ s central residual deformation increased rapidly. The overpressure peak showed a decreasing trend from the same height of initiation point to both ends of the member. In near-field explosion, the equilateral-angle steel member presented a kind of local buckling failure mode.
出处
《工业建筑》
CSCD
北大核心
2017年第5期151-157,共7页
Industrial Construction
基金
国家自然科学基金项目(51611140123)
教育部中央高校基本科研业务费专项资金资助项目(CDJXY200002
CDJZR12200017)
关键词
爆炸冲击荷载
等边角钢构件
高压输电塔
静爆试验
超压荷载
blast loading
equilateral-angle steel member
HV transmission tower
static explosion test
overpressure load
