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Considering explosive charge shape and embedded depth in the design of concrete shelter thickness

Defence Technology（防务技术） 2023年第2期20卷 44-57页

作者： Yi Fan Li Chen Jian Hong Runqing Yu Hengbo Xiang Qin Fang State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjingJiangsu210007China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjingJiangsu211189China The People's Liberation Army 95338 Troops GuangzhouGuangdong510403China

Cost and safety are important considerations when designing the thickness of a protective reinforced concrete *** blast perforation limit(BPL)is the minimum concrete shelter thickness that resists perforation under blast *** investigate the influence of the depth of embedment(DOE)and length-to-diameter ratio(L/D)of an explosive charge on the BPL,the results of an explosion test using a slender explosive partially embedded in a reinforced concrete slab were used to validate a refined finite element *** model was then applied to conduct more than 300 simulations with strictly controlled variables,obtaining the BPLs for various concrete slabs subjected to charge DOEs ranging from0 to∞and L/D values ranging from 0.89 to *** numerical results were compared with the experimental results from published literature,further verifying the reliability of the *** findings indicate that for the same explosive charge mass and L/D,the greater the DOE,the larger the critical residual thickness(Rc,defined as the difference between the BPL and DOE)up to a certain constant value;for the same explosive charge mass and DOE,the greater the L/D,the smaller the ***,corresponding DOE and shape coefficients were introduced to derive a new equation for the BPL,providing a theoretical approach to the design and safety assessment of protective structures.

关键词： Blast resistance charge shape Embedded depth Structural design

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Response of masonry systems against blast loading

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Defence Technology（防务技术） 2021年第4期17卷 1326-1337页

作者： Eid Badshah Amjad Naseer Mohammad Ashraf Tauseef Ahmad Department of Civil Engineering UET PeshawarPakistan Electrical Engineering Department CECOS University of IT&Emerging Sciences PeshawarPakistan

In this paper eight successive experimental blast tests with an increasing TNT equivalent charge weights ranging from 0.56 kg to 17.78 kg were conducted on unreinforced,ferrocemented overlay masonry and confined masonry *** pressure-time history caused by the blast was recorded by pressure sensors installed on the test *** resulting damage pattern was observed during each *** zones in the three systems of masonry were *** distances for different damage levels in the three masonry systems were experimentally *** results provide a basis for determining the response of each masonry system against blast ***,efficiency of ferrocemented overlay masonry and confined masonry was found established in mitigation against blast loads.

关键词： Peak over pressure Pressure sensor Composition-B TNT Scaled distance Stand-off distance charge shape Confined Unreinforced Ferrocemented

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