Simplified impact force model of pier under heavy vehicle collision

ZHAO Wu-chao; QIAN Jiang; WANG Juan

doi:10.19818/j.cnki.1671-1637.2019.04.005

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ZHAO Wu-chao, QIAN Jiang, WANG Juan. Simplified impact force model of pier under heavy vehicle collision[J]. Journal of Traffic and Transportation Engineering, 2019, 19(4): 47-58. doi: 10.19818/j.cnki.1671-1637.2019.04.005

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ZHAO Wu-chao, QIAN Jiang, WANG Juan. Simplified impact force model of pier under heavy vehicle collision[J]. Journal of Traffic and Transportation Engineering, 2019, 19(4): 47-58. doi: 10.19818/j.cnki.1671-1637.2019.04.005

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Simplified impact force model of pier under heavy vehicle collision

doi: 10.19818/j.cnki.1671-1637.2019.04.005

1.
State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
2.
Business School, Shanghai Jian Qiao University, Shanghai 201306, China

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Author Bio:
ZHAO Wu-chao(1992-), male, doctoral student, zwuchao219@126.com

QIAN Jiang(1960-), male, professor, PhD, jqian@tongji.edu.cn
Received Date: 2019-03-01
Publish Date: 2019-08-25

Abstract

Abstract

To explore the safety of reinforced concrete piers under heavy vehicle collision, a refined finite element (FE) model of heavy vehicle-pier collision was established. The effects of impact velocity, pier diameter, superstructure boundary condition and cargo height on the failure mode and internal force distribution of pier were investigated. The characteristics of vehicle impact force under different conditions were analyzed, and a simplified impact force model was proposed based on the dissipation characteristics of vehicle initial kinetic energy. Analysis result shows that the heavy vehicle collision process can be divided into three stages such as the bumper, engine and cargo collide the pier. The impact force is mainly concentrated at the elevation of 0.9 m in the first two collision stages, and is distributed at the elevation of 2.7 m in the third collision stage. Under the heavy vehicle collision, not only will there be serious damage at the end of pier, but also there may be serious local punching shear damage near the collision site. Due to the neglection to the dynamic effect of impact load and the coupling effect of vehicle and pier, the equivalent static design approach recommended by the General Code for Design of Highway Bridges and Culverts (JTG D60—2015) is difficult to obtain an actual impact response of pier. The impact velocity has the most significant influence on the internal force and impact force of pier. The difference of cargo height changes the spatial distribution of impact force, but will not affect the maximum internal force response of pier. A threshold of 6.5 MJ exists in the initial kinetic energy of heavy vehicle. When the initial kinetic energy is less than the threshold, the impact actions from the vehicle engine and bumper play dominant roles in the dynamic response of pier. On the contrary, the impact action of cargo at the back determines the peak impact force. The relative error of the predicted maximum internal force responses of pier between the simplified impact force model and the refined vehicle model is less than 8%, and the computation time shortens from 6-7 h to 4 min.
- bridge engineering,
- impact force,
- numerical simulation,
- internal force distribution,
- energy threshold,
- simplified model

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References(31)

References

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Simplified impact force model of pier under heavy vehicle collision

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