Abstract: Addressing the driving safety risks in bridge-tunnel transition sections of mountain highways under strong crosswinds, an analysis is conducted based on a multi-dimensional coupled mechanical model of vehicle-road-environment. Utilizing the CarSim simulation platform, 240 scenarios were constructed, encompassing four typical vehicle speeds, three bridge lengths, five wind speed gradients, and complex environmental conditions such as ice and snow with low adhesion. The focus is on analyzing the impact of parameters such as wind speed, vehicle speed (60, 80, 100, 120 km/h), bridge length (20, 65, 100 m), road adhesion coefficient, superelevation (0.06), and circular curve radius on vehicle driving safety and lateral stability. Corrective methods are proposed for unstable conditions. The research results indicate that vehicle driving stability is negatively correlated with wind speed and positively correlated with superelevation. When encountering a wind speed of level 5, a bridge length of 100 m, a superelevation of 0.06, and icy conditions, the circular curve radius needs to be increased to 134, 270, and 466 m, respectively, to counteract the lateral wind load and ensure safe and stable vehicle operation.

Key words: traffic engineering; mountainous area strong crosswind; aerodynamics; vehicle-road-environment coupling; CarSim simulation

摘要： 针对山区高速公路桥隧连接段在强侧风作用下的行车安全风险，基于车-路-环境多维度耦合力学模型展开分析。通过CarSim仿真平台构建了240组工况(涵盖4种典型车速、 3种桥梁长度、 5级风速梯度及冰雪低附着等复杂环境条件)，重点分析了风速、车速(60、 80、 100、 120 km/h)、桥梁长度(20、 65、 100 m)、路面附着系数、超高(0.06)及圆曲线半径等参数对车辆行驶安全性及横向稳定性的影响，并针对不平稳状态提出了修正方法。研究结果表明：车辆行驶平稳性与风速呈负相关，与超高值呈正相关，当遭遇5级风、 桥长为100 m、 超高为0.06且为结冰情况时，需将圆曲线半径提升至134、 270、 466 m才能以抵消横向风荷载，保证车辆行驶时的安全平稳性。

关键词: 交通工程；山区强侧风；空气动力学；车-路-环境耦合；CarSim仿真