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为了给高速公路大中修养护和改扩建工程纵面线形设计提供参考,采用五自由度车辆-道路相互作用分析模型,以微型车和客车为代表车型,根据Newmark-β法编制MATLAB程序进行求解,获得了车辆振动加速度。根据ISO 2631-1标准,以加权加速度均方根值为舒适性评价指标,分析了错台型、折线型和指数型不均匀沉降条件下车辆-道路的相互作用规律和坡长、坡差、竖曲线半径等道路纵面设计指标对行车舒适性的影响规律,最后结合杭甬高速公路改扩建工程实例进行了分析。研究结果表明:在相同条件下,车辆行驶速度越大,由道路不均匀沉降引起的振动加速度越大;行车舒适性随错台型沉降台阶高度、折线型和指数型沉降坡度的增大而降低,为保持舒适,高等级公路错台型的台阶高度不宜超过1cm,折线型的坡度变化不宜超过0.3%,指数型的控制标准应更严格;坡长和坡度大小并不直接影响行车舒适性,行车舒适性随坡差的减小、竖曲线半径的增大而提高;在改扩建公路工程中,当条件受限时,在满足视距的前提下,经论证,可适当突破公路路线设计规范对最小坡长的限制,按行车舒适性的要求进行纵面线形设计。
In order to provide a reference for longitudinal alignment design of highway maintenance, renovation and extension engineering, a 5-DOF vehicle-road interaction analysis model is adopted, and a mini-car and a passenger car are taken as representative models, and a MATLAB program is developed according to Newmark-β method , Got the vehicle vibration acceleration. According to the ISO 2631-1 standard, the root mean square value of weighted acceleration is taken as the index of comfort evaluation. The law of vehicle-road interaction and slope length, slope difference, Vertical Curve Radius and other road longitudinal design indicators on the driving comfort of the law, combined with Hangzhou-Ningbo Expressway reconstruction project examples were analyzed. The results show that under the same conditions, the greater the vehicle traveling speed, the greater the vibration acceleration caused by the uneven settlement of the road; the comfort of driving decreases with the increase of the settlement height, the folding line type and the exponential settlement slope of the dislocation table , In order to maintain comfort, the height of the high-grade road in Taiwan should not exceed 1cm, the change of the slope of the line should not exceed 0.3%, the exponential control standard should be more strict; the slope length and slope size do not directly affect traffic comfort, The driving comfort increases with the decrease of slope and the increase of the radius of vertical curve. When the conditions are limited, under the premise of satisfying the line-of-sight, the design of highway route can be properly broken through the demonstration The minimum length of the slope limit, according to the requirements of the comfort of the vehicle longitudinal linear design.