Effect of steel ratio on the impact resistance of GFRP tube concrete-encased steel composite members

ZHANG Haixia; CHEN Huan; JU Shilong

doi:10.11883/bzycj-2023-0246

Volume 44 Issue 4

Apr. 2024

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ZHANG Haixia, CHEN Huan, JU Shilong. Effect of steel ratio on the impact resistance of GFRP tube concrete-encased steel composite members[J]. Explosion And Shock Waves, 2024, 44(4): 043202. doi: 10.11883/bzycj-2023-0246

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Effect of steel ratio on the impact resistance of GFRP tube concrete-encased steel composite members

doi: 10.11883/bzycj-2023-0246

School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China

Received Date: 2023-07-13
Rev Recd Date: 2023-11-21

Available Online: 2023-12-27

Publish Date: 2024-04-07

Abstract

Abstract

To investigate the effect of the steel ratio on the impact resistance of glass fiber reinforced polymer (GFRP) tube concrete-encased steel composite members, 15 numerical models of composite members were established. The whole impact process, the dynamic response and the stress distribution of each composite member at different characteristic moments during the low-velocity impact were analyzed. The bending moment contributions at typical cross sections and the energy dissipation under different impact moments were explored. Meanwhile, the corresponding failure mode was determined, based on the maximum principal plastic strain distribution of concrete, tensile and compression damage of GFRP tube matrix, and equivalent plastic strain distribution of steel. Additionally, the effect of the steel ratio on the impact performance of members with different slenderness ratios was investigated by analyzing the time history curves of the impact force, displacement, energy transformation and energy consumption. The results show that the impact load-bearing capacity of GFRP tube concrete-encased steel members is improved by 7% to 134% and the lateral displacement is reduced by 13% to 68% compared with the GFRP tube concrete members. Furthermore, it can be observed that the failure mode of the members is mainly bending, and the concrete is crushed in the impact region. The bending stiffness has a significant influence on the impact performance of the member under lateral impact loading. The impact force of the member increases with the increase in the steel ratio, whereas the impact force of the member decreases with the increase in the slenderness ratio. Moreover, narrow flange steel with a higher moment of inertia is more favorable for the impact resistance of the member when the difference in steel ratio is 1.5%. The energy consumption of the encased steel is a major contributor to the total energy consumption of the member when the slenderness ratio is greater than or equal to 20. The GFRP tube plays a dual role in bearing the impact force and confining the concrete in a circumferential direction at the oscillation stage during the impact process.
- GFRP tube concrete-encased steel composite member,
- lateral impact,
- steel ratio,
- failure mode

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References

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