基于HJC模型的车辆-桥墩碰撞响应分析
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任亮(1980—),男,硕士生导师,副教授,研究方向为桥梁抗震与抗撞。E-mail:renliang@ecjtu.jx.cn。

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U443.22

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国家自然科学基金项目(52068024);江西省自然科学基金项目(20192BAB206042);江西省重点研发计划一般项目(20202BBG73035)


Analysis of Vehicle-Pier Collision Response Based on HJC ModelAnalysis of Vehicle-Pier Collision Response Based on HJC ModelAnalysis of Vehicle-Pier Collision Response Based on HJC ModelAnalysis of Vehicle-Pier Collision Response Based on HJC Model
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    摘要:

    为探讨 HJC 模型在车辆-桥墩碰撞分析中的适用性和动力响应,应用大型有限元程序 LS-DYNA,明确了 HJC 模型中关键参数的取值,建立了落锤冲击数值模型并与试验验证;在此基础上进一步构建了车辆-桥墩碰撞分析模型,校验了碰撞过程系统能量转换,探讨了车速、车重和撞击位置对钢筋混凝土桥墩撞击力与墩顶位移的影响。 结果表明:HJC 模型能较好的模拟落锤冲击作用下钢筋混凝土梁的动力响应;撞击力峰值和墩顶位移峰值随撞击速度和撞击质量的增加而增大,随撞击偏心距的增加而逐渐削弱;撞击速度的提升将加快峰值响应的出现,而撞击质量的增大将延缓峰值响应的出现,当车速超过 100 km/h 时,撞击力和墩顶位移时程曲线将出现两个显著的峰值,应考虑车厢的二次撞击响应。

    Abstract:

    To discuss the applicability and dynamic response of HJC model used in the numerical analysis of vehicle-pier collision in LS -DYNA software, the values of key parameters in the HJC model were determined based on the model theory, and a numerical model of drop-hammer impact test was established and validated. On the basis, a vehicle-pier impact analysis model was established, the energy conversion of the system during the collision was verified, and the effects of vehicle speed, vehicle weight and impact position on the impact force and displacement of the pier’s top were discussed. The results show that the HJC model can be used to better simulate the dynamic response of the impact test when the appropriate parameters are selected. The peak values of impact force and the displacement at the pier’s top increase with the increase of impact velocity and impact mass, but gradually weaken with the increase of impact eccentric distance. The increase of impact velocity accelerates the occurrence of peak response, while the increase of impact mass delays the occurrence of peak response. When the speed exceeds 100km/h, two peaks in the time-history curves of impact force and displacement at the pier’s top occur, and the secondary impact response of the carriage should be considered.

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任亮,万超,喻贤明.基于HJC模型的车辆-桥墩碰撞响应分析[J].华东交通大学学报,2022,39(3):24-30.

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  • 在线发布日期: 2022-07-15
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