Damage evaluation and protective effect analysis for a large-scale water transmission box culvert under action of ground surface blast loads

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 28-37.

YANG Guangdong1,2, WANG Gaohui1,2, LU Wenbo1,2, ZHAO Xiaohua1,2, YAN Peng1,2, CHEN Ming1,2

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Abstract

With increase in trans-regional water transfer projects, anti-blast problems of water transmission box culverts receive great attentions. Here, considering the strain rate effect of concrete material under blast loading, fluid-structure interaction and nonlinear dynamic responses of structures, a reinforced concrete (RC) box culvert fully coupled model based on Lagrange and Euler combined method was established under the action of ground surface blast loads. A numerical model of soil body surface blast was established. Compared with the published empirical formulas and the actual blast tests, the reliabilities of the soil surface blast model and the RC box culvert one under soil surface blast loads were verified, respectively. Dynamic responses and damage processes of the RC box culvert under soil surface blast with and without water were contrastively studied. The shock wave propagation characteristics in the RC box culvert model were investigated. Meanwhile, polystyrene foams were used as protective material, and its effects on the RC box culvert anti-blasting performance were explored. The results showed that ground surface blast loads are a great threat to the security of the RC box culvert; laying polystyrene foams on the top of the RC box culvert can improve its anti-blast performance effectively.

Key words

water transmission box culvert / surface explosion / dynamic response / damage characteristics / safeguard procedures.

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YANG Guangdong1,2, WANG Gaohui1,2, LU Wenbo1,2, ZHAO Xiaohua1,2, YAN Peng1,2, CHEN Ming1,2. Damage evaluation and protective effect analysis for a large-scale water transmission box culvert under action of ground surface blast loads[J]. Journal of Vibration and Shock, 2019, 38(5): 28-37

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