Investigations on the influence of circumferential gaps on the lateral impact behaviour of circular CFST columns

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 92-102.

SHEN Qihan1,2,3，LIU Junjie1，ZHU Weijun1，WANG Jingfeng1,3，XIE Qiang1

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Abstract

The frequency of vehicle and ship impact accidents acting on the piers of city viaducts and river-crossing bridges is highly improved in recent years. Nevertheless, the concrete gap defect is observed to commonly exist in concrete-filled steel tubular (CFST) engineering practices, due to disadvantageous factors in material properties and working environment. While few investigations on the lateral impact behavior of CFST members with concrete gap defects have been reported. Therefore, this paper developed a finite element (FE) model of circular CFST column under lateral impact considering the feature of the circumferential gap, and the accuracy of the FE model is validated by some relative experiments. The influence mechanism of circumferential gaps on the typical failure modes, the featured time history curves, the stress/strain distribution rule during the full-range impact process and the steel-concrete contact bahaviour of the circular CFST column is revealed in detail. Moreover, the effect of gap ratio, axial compression ratio, boundary condition, diameter/thickness ratio, impact velocity and impact mass, etc. on the impact force, the flexural deflection and the energy dissipation is investigated systematically. The results shows that the lateral impact resistance of the circular CFST column is gradually weakened by the existence of circumferential gap. With the increase of circumferential gap ratio, the impact force and energy dissipation of the circular CFST column are reduced by degrees, while the flexural deflection shows an opposite trend. In addition, the local depression degree of the steel tube under lateral impact would be more obvious with the increase of void ratio, due to the lack of efficient supporting effect provided by the core concrete.

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circumferential gap / concrete-filled steel tube / lateral impact / numerical analysis / failure mechanism

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SHEN Qihan1, 2, 3, LIU Junjie1, ZHU Weijun1, WANG Jingfeng1, 3, XIE Qiang1. Investigations on the influence of circumferential gaps on the lateral impact behaviour of circular CFST columns[J]. Journal of Vibration and Shock, 2024, 43(16): 92-102

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