不发生侧滑为指标的跨海大桥安全行车风速分析

为了保证风环境下跨海大桥上车辆的行车安全,必须给出合理的安全行车风速.采用修正的κ-ε方程作为湍流模型的控制方程,对车桥模型的风流场进行了流场分析,得到了桥上车辆的压力分布,进而获得了桥上行驶车辆的阻力系数和升力系数.以车辆不发生侧滑为指标给出了跨海大桥不同桥面特征下的安全行车风速标准,并与普通高速公路的相关安全行车风速进行了比较.结果表明:跨海大桥上车辆的安全行车风速要低于普通高速公路的安全行车风速.

Analysis of safety wind velocity of driving on sea-cross bridgebased on target of no sideslip

The reasonable w ind velocity must be pr opo sed for the safety of vehicles driv ing o n sea-crossbridgeunder wind environment . T he modif ied J-Eequatio n w as used as the go verning equation of tur bulentflow model. T he co ef ficient s of resistance for ces and lift forces were obtained as w ell as the pr essure dist ribution of vehicles o n bridges through the analy sis of w ind flow f ield around the vehicle-bridg e model . T hevalues of w ind v elo city fo r safe driving on sea-cross bridge w ith dif ferent surface features w er e sug gestedbased on the targ et of no sideslip. The comparison shows that the values o n sea-cross bridge are less thanthe ones on highw ays w ith dif ferent characters.