Impact resistances of FRP-concrete-steel double skin tubular columns and their mechanism analyses

ZHAO Yijia; WANG Rui; ZHAO Hui; MAO Min; SHEN Linghua

doi:10.11883/bzycj-2022-0335

Volume 43 Issue 10

Oct. 2023

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ZHAO Yijia, WANG Rui, ZHAO Hui, MAO Min, SHEN Linghua. Impact resistances of FRP-concrete-steel double skin tubular columns and their mechanism analyses[J]. Explosion And Shock Waves, 2023, 43(10): 103101. doi: 10.11883/bzycj-2022-0335

Citation:

ZHAO Yijia, WANG Rui, ZHAO Hui, MAO Min, SHEN Linghua. Impact resistances of FRP-concrete-steel double skin tubular columns and their mechanism analyses[J]. Explosion And Shock Waves, 2023, 43(10): 103101. doi: 10.11883/bzycj-2022-0335

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Impact resistances of FRP-concrete-steel double skin tubular columns and their mechanism analyses

doi: 10.11883/bzycj-2022-0335

ZHAO Yijia^1
,,
WANG Rui¹,
ZHAO Hui^{1
,
,},
MAO Min²,
SHEN Linghua¹

1.
College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Transportation Technology Research and Development Co. Ltd., Taiyuan 030032, Shanxi, China

Received Date: 2022-08-07
Rev Recd Date: 2022-12-27
Publish Date: 2023-10-27

Abstract

Abstract

FRP-concrete-steel double skin tubular columns (FRP-DSTCs) consist of an outer FRP tube and an inner steel tube, with the space between them infilled by concrete. This type of members has been applied in bridge piers, and the impact resistance is an important index for its utilization. Therefore, based on the previous test, the finite element analysis (FEA) models considering the coupling of axial and impact loads are established using ABAQUS software and verified by comparing the simulation and test results. In the model, the static implicit and dynamic explicit analysis are coupled by using Restart and Import commands. In addition, the strain rate effect of the steel and concrete are considered. Firstly, the mechanism of impact resistance under coupling axial and impact loads is analyzed. Then, the influence of thickness and fiber orientations of FRP, axial-load ratio, impact velocity, hollow ratio, diameter-to-thickness ratio of the steel tube and material strengths on the impact resistance are investigated. Finally, the formula used to predict the dynamic increase factor of the plateau impact force under coupling axial and impact loads is suggested. Results indicate that the deformation pattern of FRP-DSTCs mainly presents flexural deformation, and the plastic deformation of concrete is the main energy dissipation mechanism of such members. The outer FRP can significantly improve the lateral impact resistance of the specimen, and increasing the number of FRP layers leads to enhanced impact resistance. In addition, the axial load has an obvious effect on the impact resistance, and the effect is negative when the axial load ratio exceeds 0.7. The diameter-to-thickness ratio of steel tube presents marginal effects on the impact resistance. The proposed formula that considers the hollow ratio, strengths of concrete and inner steel tube, thickness of FRP, axial load ratio and impact velocity can reasonably predict the impact bearing capacity of FRP-DSTCs.
- impact resistance,
- impact force,
- FRP-concrete-steel double skin tubular columns,
- mechanism analysis,
- dynamic increase factor

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References(28)

References

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