摘要
以钢箱梁节段缩尺模型为爆炸冲击波作用施加面,开展了9种不同比例距离下的爆炸冲击波作用试验工况,对比分析了其他学者的经验公式与本文实测数据中有关正超压峰值的差别,整体上本文实测数据偏大偏不利,并拟合对比了基于实测的多项式函数、指数函数及幂函数,误差和精度分析表明采用多项式函数较为合理;对正超压作用时长进行构成分析,表明在钢箱梁节段模型顶板上方发生武器爆炸等化学爆炸冲击波作用时长较短且均不超过1 ms,并拟合了四次多项式经验公式;另外研究表明正超压从0脉冲式跃迁至超压峰值时长所占比例很小、脉冲率很高,为正超压作用总时长的3%以下,为典型的超高动荷载施加模式。
With steel box girder small scale segmental models as test structure carried on blast shockwave,a series of blast experiments was designed.There were nine blast situations for different scale distance.The differences between empirical formula results and measured data were analyzed about positive overpressure peak value.Overall the measured data measured was much larger than the formula results.Based on the measured data,polynomial,exponential and power functions were fitted to select the polynomial function as the best fitting formula choice.For positive overpressure of box steel girder suffered from the blast load,the duration was so short that it is under 1ms.A four polynomial-fitted empirical formula was derived for duration of positive overpressure.The duration proportion of pulse growth of positive overpressure peak value is less than3%.It is a typical high pulse rate and ultra-high dynamic load type.
作者
耿少波
刘亚玲
刘玉存
李洪
GENG Shaobo;LIU Yaling;LIU Yucun;LI Hong(Department of Civil Engineering,North University of China,Taiyuan 030051,China;National Engineering Laboratory for Bridge Structure Safety Technology,Chang’an University,Xi’an 710064,China;Department of Weaponry Science and Technology,North University of China,Taiyuan 030051,China)
出处
《结构工程师》
北大核心
2018年第6期87-94,共8页
Structural Engineers
基金
国家自然科学基金项目(51408558)
桥梁结构安全技术国家工程实验室开放基金(2014G1502002)
关键词
钢箱梁
缩尺模型
爆炸作用
冲击波
正超压
超压峰值
steel box girder
scale model
blast load
shockwave
positive overpressure
overpressure peak value
