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兵工学报 ›› 2024, Vol. 45 ›› Issue (3): 864-874.doi: 10.12382/bgxb.2022.0897

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温压炸药近爆作用下RC梁破坏特征和毁伤规律试验研究

刘举1, 张国凯1,*(), 王振1, 姚箭1, 李杰2, 于思远1, 纪玉国1   

  1. 1 南京理工大学 机械工程学院, 江苏 南京 210094
    2 陆军工程大学 爆炸冲击防灾减灾国家重点实验室, 江苏 南京 210007
  • 收稿日期:2022-10-06 上线日期:2023-01-11
  • 通讯作者:
    * 通信作者邮箱:
  • 基金资助:
    国家自然科学基金项目(52278504); 江苏省自然科学基金项目(BK20220141)

Experimental Study on the Damage Characteristics and Laws of RC Beams under Close-in Blast Loading of Thermobaric Explosives

LIU Ju1, ZHANG Guokai1,*(), WANG Zhen1, YAO Jian1, LI Jie2, YU Siyuan1, JI Yuguo1   

  1. 1 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
    2 State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
  • Received:2022-10-06 Online:2023-01-11

摘要:

作为一种高能量密度炸药,温压炸药的爆炸毁伤效应及毁伤机理有别于传统炸药。结合敞开空间温压炸药爆炸冲击波及热效应试验,研究温压炸药爆炸冲击波特征及传播规律,采用高速摄像技术和光纤多谱线测温技术分析爆炸火球演化特征及火球表面温度变化规律。为研究温压炸药爆炸荷载对钢筋混凝土结构的毁伤效应,针对两种典型钢筋混凝土梁开展不同比例爆距下的爆炸试验,阐明两种钢筋混凝土梁在不同药量、不同爆距下的破坏特征和毁伤规律。研究结果表明:相比TNT炸药,温压炸药爆炸冲击波具有超压峰值大、正压作用时间长及峰值衰减缓慢的特点,温压炸药爆炸最高温度达到2400K,超过1000K的高温持续时间超过160ms,高冲量爆炸冲击及持续高温作用导致钢筋混凝土结构受到更大程度的毁伤破坏。结合药量对毁伤规律的影响,提出钢筋混凝土梁在温压炸药近区(0.20~0.75m)爆炸荷载条件下基于比例爆距和药量的毁伤判据。

关键词: 温压炸药, 钢筋混凝土梁, 破坏特征, 毁伤判据

Abstract:

As a high-energy density explosive, the blast damage effect and mechanism of thermobaric explosive are different from traditional explosives. First of all, the characteristics and propagation law of thermobaric explosive blast shock wave are studied through the open space thermobaric explosive blast shock wave and thermal effect test. High-speed camera technology and fiber optic multispectral line temperature measurement technology are used to analyze the evolution characteristics of explosive fireball and the fireball surface temperature change pattern. Secondly, in order to study the destructive effect of the blast loads of thermobaric explosives on reinforced concrete structures, two typical reinforced concrete beams were subjected to explosion tests with different proportional blast distances. The damage characteristics and laws of two kinds of reinforced concrete (RC) beams with different charges and distances were elucidated. The research results show that, compared to TNT, the blast shock wave of thermobaric explosive has a large overpressure peak, long positive pressure action time and slow decay of peak characteristics, the thermobaric explosive blast temperature reaches up to 2400K, more than 1000K high temperature duration is more than 160ms, and the high impulse blast impact and sustained high temperature action lead to a greater degree of damage to reinforced concrete structures. Combining the effect of charges on the pattern of destruction, a damage criterion based on the proportional scaled distance and the amount of charge is proposed for reinforced concrete beams under the close-in (0.2-0.75m) blast loading of thermobaric explosives.

Key words: thermobaric explosive, reinforced concrete beam, damage characteristics, damage criterion

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