Lead spall velocity of fragments of ultra-high-performance concrete slabs under partially embedded cylindrical charge-induced explosion
作者机构：State Key Laboratory of Disaster Prevention&Mitigation of Explosion&ImpactArmy Engineering University of PLANanjingJiangsu210007China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of EducationSoutheast UniversityNanjingJiangsu211189China State Key Laboratory of High Performance Civil Engineering MaterialsNanjingJiangsu211103China
出 版 物：《Defence Technology（防务技术）》 (Defence Technology)
年 卷 期：2023年第23卷第5期
页 面：50-59页
核心收录：
学科分类：11[军事学] 08[工学] 081304[工学-建筑技术科学] 0813[工学-建筑学] 0714[理学-统计学（可授理学、经济学学位）] 0814[工学-土木工程] 1109[军事学-军事装备学] 0701[理学-数学]
基 金：supported by the National Natural Science Foundation of China[No.51978166]。
主 题：Ultra-high-performance concrete Reinforced concrete slabs Explosion Fragment velocity Blast resistance
摘 要：When an explosion occurs close to or partially within the face of a concrete structure, fragments are rapidly launched from the opposite face of the structure owing to concrete spalling, posing a significant risk to nearby personnel and equipment. To study the lead fragment velocity of ultra-high-performance concrete(UHPC), partially embedded explosion experiments were performed on UHPC slabs of limited thickness using a cylindrical trinitrotoluene charge. The launch angles and velocities of the resulting fragments were the determined using images collected by high-speed camera to document the concrete spalling and fragment launching process. The results showed that UHPC slabs without fiber reinforcement had a fragment velocity distribution of 0-118.3 m/s, which are largely identical to that for a normal-strength concrete(NSC) slab. In addition, the fragment velocity was negatively correlated to the angle between the velocity vector and vertical direction. An empirical Eq. for the lead spall velocity of UHPC and NSC slabs was then proposed based on a large volume of existing experimental data.
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