Blast resistance of reinforced concrete arches subjected to underwater explosions

YANG Guangdong; TIAN Xujie; FAN Yong; TIAN Bin; LU Xiaochun

doi:10.11883/bzycj-2023-0235

Volume 44 Issue 2

Feb. 2024

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YANG Guangdong, TIAN Xujie, FAN Yong, TIAN Bin, LU Xiaochun. Blast resistance of reinforced concrete arches subjected to underwater explosions[J]. Explosion And Shock Waves, 2024, 44(2): 023101. doi: 10.11883/bzycj-2023-0235

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YANG Guangdong, TIAN Xujie, FAN Yong, TIAN Bin, LU Xiaochun. Blast resistance of reinforced concrete arches subjected to underwater explosions[J]. Explosion And Shock Waves, 2024, 44(2): 023101. doi: 10.11883/bzycj-2023-0235

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Blast resistance of reinforced concrete arches subjected to underwater explosions

doi: 10.11883/bzycj-2023-0235

YANG Guangdong^{1, 2
,},
TIAN Xujie^{1, 2},
FAN Yong^{1, 2
,
,},
TIAN Bin^{1, 2},
LU Xiaochun^{1, 2}

1.
Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, Hubei, China
2.
College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, Hubei, China

Received Date: 2023-07-04
Rev Recd Date: 2023-11-06

Available Online: 2023-11-30

Publish Date: 2024-02-06

Abstract

Abstract

As common structures in hydraulic engineering, the arch structures may suffer from explosion load during their operation life. In order to explore the dynamic response characteristics and failure features of reinforced concrete arches subjected to underwater explosions, two reinforced concrete arch specimens were fabricated and underwater explosion tests were carried out. The tests consisted of two groups: external explosion and internal explosion. 10 g emulsion explosives were used, and the minimum distance between the explosion source and the structure was 10 cm (the explosives were placed directly above or below the arch). The time history curves of water pressure and structural acceleration at typical sections of the arches during the explosion tests were recorded. Based on the Arbitrary Lagrange-Euler (ALE) algorithm, a multi-material dynamic coupling model, including air, water, explosive, and reinforced concrete arch was established. The initiation of explosive, the propagation of shock wave, the interaction between fluid and solid, and the dynamic response of the structure were considered in the numerical model. The reliability of the numerical model was verified by comparing the numerical results and the experimental results. With the calibrated numerical model, the difference of dynamic response of reinforced concrete arches under external explosion and internal explosion was further studied. The results show that more energy acts on the concrete arch, and the structural response is stronger when subjected to internal explosion. Large cracks occur at the vault and waist induced by external explosion. Compared with the external explosion, the number of cracks significantly increases under internal explosion, and cracks also appear at the spandrel. The ability of reinforced concrete arch to resist external explosive loads is significantly stronger than that of internal explosive loads although the explosive weight is the same. For concrete arches that are vulnerable to external explosions, high strength concrete or reinforced reinforcement can be appropriately used in the arch vault and waist. For concrete arches that may be subjected to internal explosions, protective nets can be set to make the explosion occur at a longer distance away from the structures, or high strength materials can be used to resist the overall deformation.
- reinforced concrete arch,
- external explosion,
- internal explosion,
- underwater explosion,
- blast resistance.

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References(29)

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