Investigation on vehicle lateral instability when crossing a curved highway bridge during an earthquake
Investigation on vehicle lateral instability when crossing a curved highway bridge during an earthquake
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DOI：
10.1080/15732479.2020.1766515
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发表时间：
2020-05
影响因子：
3.7
通讯作者：
D. Siringoringo;Y. Fujino;Masaaki Yabe
中科院分区：
文献类型：
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作者：
D. Siringoringo;Y. Fujino;Masaaki Yabe
摘要对地震作用下车辆通过曲线公路桥时的失稳问题进行了数值研究。采用双轴车辆动力学模型，建立了曲线梁桥地震激励下车辆运动的分析框架。该模型考虑了特定半径、外倾角和纵坡曲线梁作用下的平面外运动和面内运动沿着方向。评价了临界车辆稳定性的两个标准，即侧翻稳定性和侧滑稳定性。以某高架道路交叉口为例，采用三维有限元模型进行了数值模拟。研究了弯桥半径、地震烈度、车速和驾驶员反应对车辆稳定性的影响。结果表明，在相同的行驶速度和地震烈度下，车辆在曲线桥上行驶时发生侧翻和侧滑失稳的可能性比车辆在直线桥上行驶时更大。仿真结果表明，弯桥效应、转向角、弯道处的路拱效应对车轮法向力有显著影响。这些条件有助于减少车辆车轮上的法向力，并增加车辆不稳定的风险。
Abstract This paper describes a numerical study on the vehicle instability when crossing curved highway bridge during an earthquake. Analytical framework using two-axle vehicle dynamics model is developed to describe vehicle vibration when moving under seismic excitation from the curved bridge girder. The model includes out-of-plane and in-plane motion along with the effect of curved girder with specific radius, camber angle and longitudinal grade. Two criteria for critical vehicle stability are evaluated namely the rollover and sideslip stability. As case study, numerical simulations were conducted using three-dimensional finite element model of an elevated highway junction consisting of four curved sections and two straight sections. Effects of curved bridge radii, level of earthquake, vehicle velocity and driver reaction on the vehicle stability were investigated. It was found that a vehicle moving on a curved bridge during earthquake has a larger possibility for rollover and sideslip instability than a vehicle moving on a straight section for the same driving velocity and level of earthquake. Results of simulations demonstrate that normal forces on vehicle’s wheels are significantly influenced by the curved bridge effects, steering angle, effect of road camber at the curved section. These conditions contributed to reduction of normal forces on vehicle’s wheels and increased the risk of vehicle instability.