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Dynamic Response Analysis of Vehicle-Pier Collision with Multi Parameters
DOI: 10.12677/HJCE.2022.1111134, PDF , HTML, XML, 下载: 103  浏览: 188  国家自然科学基金支持

Abstract: Longitudinal slope along the bridge, horizontal impact angle and horizontal eccentricity are the main geometric parameters of vehicle-pier collision. The influence of these parameters on vehicle-pier collision dynamic response under different vehicle speeds is studied. Based on the simplified vehicle model, a three-dimensional dynamic finite element model for vehicle-pier collision simulation is established by using ANSYS and LS-DYNA software. Taking a square pier as an example, the effects of the geometric parameters on the impact force along the bridge when the speed is 40 Km/h, 60 Km/h, 80 Km/h are analyzed. The results show that the maximum impact force along the bridge increases with the increase of impact speed. At the same speed, as the slope increases, the maximum impact force along the bridge shows a decreasing trend. With the increase of horizontal impact angle, the maximum impact force along the bridge shows a decreasing trend. When the horizontal eccentricity is less than 0.8 m, the maximum of the impact force along the bridge increases with the increase of the horizontal eccentricity. When the horizontal eccentricity is 0.8 m, the peak value of impact force along the bridge reaches the maximum value. When the horizontal eccentricity is greater than 0.8 m, the peak value of impact force along the bridge decreases with the increase of horizontal eccentricity. The research points out the trend of the relationship between the geometry parameters and the peak value of impact force, which can provide a theoretical basis for bridge collision prevention decision and design.

1. 引言

2. 基于弹塑性随动硬化模型和刚体模型的有限元建模思路

2.1. 车辆简化模型

Figure 1. Finite element model of the vehicle-pier collision

Table 1. MAT_PLASTIC_KINEMATIC material parameters

2.2. 桥墩模型

Table 2. HJC model material parameters

2.3. 接触定义

3. 动力响应分析

3.1. 桥梁纵坡对车桥碰撞的动力响应影响分析

Figure 2. Schematic diagram of longitudinal slope along the bridge

Figure 3. Time history curves of impact forces along the bridge at different longitudinal slope along the bridge (vehicle speed = 40 km/h)

3.2. 碰撞力水平偏角对车桥碰撞的动力响应影响分析

Figure 4. Relationship between longitudinal slope along the bridge and maximum impact force along the bridge

Figure 5. Schematic diagram of horizontal impact angle

Figure 6. Time history curve of impact force along the bridge under different horizontal impact angle (vehicle speed = 40 km/h)

Figure 7. Relationship between horizontal impact angle and maximun impact force along the bridge

3.3. 撞击偏心距对车桥碰撞的动力响应影响分析

Figure 8. Deformation of the vehicle when horizontal impact angle is 45˚

Figure 9. Schematic diagram of horizontal eccentricity

Figure 10. Time history curve of impact force along the bridge under different horizontal eccentricity (vehicle speed = 40 km/h)

Figure 11. Relationship between horizontal eccentricity and maximun impact force along the bridge

4. 结论与展望

1) 碰撞时的汽车速度是影响车桥碰撞动力响应的因素之一，顺桥向撞击力最大值随汽车速度的增加而增加；

2) 就同一碰撞速度而言，随着碰撞纵坡(碰撞竖向偏角)增大，顺桥向碰撞力最大值呈现下降趋势；

3) 就同一碰撞速度而言，随着碰撞力水平偏角增加，顺桥向碰撞力最大值呈现下降趋势。

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