Dynamic response analysis of ice-bridge pier collision in water medium

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 72-82.

GONG Li, DONG Zhouquan, YANG Tengteng, CUI Yue, DU Yunfei

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Abstract

In order to accurately simulate the dynamic response of the pier structure during an ice-pier collision, the dynamic response of ice sheet and piers in a water medium under different collision impact parameters is numerically simulated using ANSYS/LS－DYNA software based on the fluid-solid coupling (FSI) calculation method. The results show that the results of the constant added mass (CAM) model are larger than those of the FSI model because the CAM model neglects the "water cushion effect" which reduces the velocity of the ice sheet, but its calculation efficiency is high and the calculation time is 1/10 of that of the FSI model, which is more conducive to the design of bridge pier collision avoidance. The FSI model is able to simulate ice-bridge pier collision scenarios more realistically. A comprehensive analysis of the different ice displacement conditions simulated in this study reveals that the bridge piers show obvious ice excited structural vibration characteristics under the effect of ice displacement impact, and the lateral displacement cloud of the bridge piers shows an obvious laminar distribution with the transfer of stress waves, with the largest lateral displacement amplitude at the top, so its impact on the overall safety of the bridge should be fully considered in the engineering design; With the increase of ice sheet speed, ice sheet thickness and ice sheet compression strength, the average value of ice load shows an approximate polynomial function relationship. In addition, it is found that when the compression strength of the ice sheet is less than 2.668MPa (the ambient temperature is higher than -15℃), the average value of the ice load decreases significantly, which indicates that the change of the ambient temperature has a significant difference for the bridge pier subjected to ice damage by the ice sheet impact and extrusion. The simulation research results are proposed to provide reference for the design of bridge and bridge pier collision avoidance facilities.

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numerical simulation / fluid-solid interaction / ice load / bridge pier / water media

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GONG Li, DONG Zhouquan, YANG Tengteng, CUI Yue, DU Yunfei. Dynamic response analysis of ice-bridge pier collision in water medium[J]. Journal of Vibration and Shock, 2024, 43(11): 72-82

References

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