Analysis of the dynamic response of prestressed concrete frame structures under blast load

SI Doudou; PAN Zuanfeng; ZENG Bin; ZHANG Haipeng; GAO Yukui

doi:10.11883/bzycj-2023-0080

Volume 43 Issue 11

Nov. 2023

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SI Doudou, PAN Zuanfeng, ZENG Bin, ZHANG Haipeng, GAO Yukui. Analysis of the dynamic response of prestressed concrete frame structures under blast load[J]. Explosion And Shock Waves, 2023, 43(11): 112201. doi: 10.11883/bzycj-2023-0080

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SI Doudou, PAN Zuanfeng, ZENG Bin, ZHANG Haipeng, GAO Yukui. Analysis of the dynamic response of prestressed concrete frame structures under blast load[J]. Explosion And Shock Waves, 2023, 43(11): 112201. doi: 10.11883/bzycj-2023-0080

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Analysis of the dynamic response of prestressed concrete frame structures under blast load

doi: 10.11883/bzycj-2023-0080

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China
3.
School of Material Science and Engineering, Tongji University, Shanghai 200092, China

Received Date: 2023-03-06
Rev Recd Date: 2023-07-19

Available Online: 2023-09-19

Publish Date: 2023-11-17

Abstract

Abstract

To study the anti-blast performance of prestressed concrete (PC) frame structure, the dynamic response of a 3-story 2-span long-span bonded/unbonded PC frame structure under the action of external remote blast loads of different scaled distances was analyzed using the finite element software LS-DYNA. In the different blast conditions, the type of explosion was a surface detonation, the explosion distance was 100 m, and the scaled distances were 2−8 m/kg^1/3. Explosive loads on the building surface were calculated according to unified facilities criteria 3-340-02. The different types of prestress in the numerical model were realized by controlling the direction of coupling of concrete and prestressing tendons. To validate the numerical model, the results of the numerical simulations were compared with the experimental results. The blast resistance mechanism, story drift ratios, structural damage mode, and damage assessment of PC frames were analyzed under blast loads at different scaled distances. The analysis results show that the ground floor of the large-span PC frame is easy to damage under the action of the external remote blast load, and the ground floor columns can be strengthened to improve the overall structural blast resistance. In the PC frame, columns relative to the frame beams are weaker and prone to damage. The PC frame structure with a low degree of redundancy is easy to collapse. The maximum story drift ratio of the prestressed concrete frame under the surface blast load is approximately linearly related to the peak reflected overpressure applied to the front wall. Compared with the unbonded prestressed concrete frame, the bonded prestressed concrete frame structure has a smaller story drift ratio, more uniform damage distribution, and better structural blast resistance. Based on the analysis results, the damage states at different scaled distances was given, which can realize the rapid assessment of the explosion damage state of prestressed concrete frame structures.
- blast load,
- dynamic response analysis,
- prestress,
- concrete frame

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References(18)

References

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