Numerical simulation on dynamic response of reinforced concrete beams to secondary explosion

ZHANG Haipeng; PAN Zuanfeng; SI Doudou

doi:10.11883/bzycj-2024-0021

Volume 44 Issue 10

Oct. 2024

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ZHANG Haipeng, PAN Zuanfeng, SI Doudou. Numerical simulation on dynamic response of reinforced concrete beams to secondary explosion[J]. Explosion And Shock Waves, 2024, 44(10): 101404. doi: 10.11883/bzycj-2024-0021

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Numerical simulation on dynamic response of reinforced concrete beams to secondary explosion

doi: 10.11883/bzycj-2024-0021

College of Civil Engineering, Tongji University, Shanghai 200092, China

Received Date: 2024-01-08
Rev Recd Date: 2024-05-25

Available Online: 2024-05-28

Publish Date: 2024-10-30

Abstract

Abstract

Terrorist attacks and local wars occur frequently, which makes the risk of buildings subjected to multiple explosions increasing. Most of the existing research focuses on the single explosion scenario, and there are few studies on the damage effect of reinforced concrete structures under multiple explosions. In order to study the damage effect of reinforcement concrete beams under secondary explosion and offset the shortcomings of the existing research, relevant numerical analysis was carried out. The damage parameters of the K&C concrete constitutive model were modified firstly. And the arbitrary Lagrangian-Eulerian method for fluid-structure interaction was used to simulate the secondary explosion experiment of reinforced concrete beam with the full restart function of LS-DYNA. The numerical analysis results were well consistent with the test results, verifying the effectiveness of the simulation method and the modified constitutive model. On this basis, the secondary explosion simulation conditions were expanded. The effects of various parameters, including scaled distance, concrete compressive strength, longitudinal reinforcement ratio and transverse reinforcement details, on the damage effect of typical size reinforcement concrete beams under secondary explosion were further analyzed. The results show that due to the compressive membrane action of reinforcement concrete beam, keeping the total equivalent TNT weight of the explosion unchanged, the damage of RC component caused by one single explosion is more serious than the cumulative damage caused by two successive explosions. The concrete compressive strength has a more significant effect on the blast resistance performance of RC beams under secondary explosion, the higher the concrete strength, the lower the damage degree of the beam under the secondary explosion. Increasing the longitudinal reinforcement ratio has no obvious effect on improving the blast resistance performance of the beam and reducing the transverse reinforcement spacing can effectively decrease the shear failure degree of reinforcement concrete beam which makes the blast resistance performance of RC beams under secondary explosion and near explosion improved. The iso-damage curves of reinforcement concrete beams with two different design parameters are further calculated and the corresponding damage degree zoning maps are established.
- reinforced concrete,
- blast load,
- secondary explosion,
- fluid-structure interaction,
- dynamic response

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References

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