基于行车舒适度的大跨连续刚构桥桥面线形调整研究

Research on Bridge Deck Linear Adjustment of Large-span Continuous Rigid Frame Bridge Based on Driving Comfort

基于MATLAB/Simulink环境建立车辆-路面系统模型,以车辆座椅竖向加权加速度均方根作为行车舒适度评价指标,分析边跨3L/8、中跨跨中位置预抛高及边墩墩顶混凝土铺装层厚度与车辆座椅竖向加权加速度均方根之间的关系。根据分析结果,提出通过调整边跨3L/8、中跨跨中位置预抛高及边墩墩顶混凝土铺装层(调平层)厚度改善桥面线形平顺性的措施,提高行车舒适度。在桥面铺装阶段,应根据原有预设成桥线形进行铺装线形拟合,同时兼顾行车舒适度。

A vehicle and pavement system model was established based on MATLAB/Simulink environment.The vertical weighted acceleration root mean square of the vehicle seat is used as the evaluation index of driving comfort.The relationship between the presetting-height of 3L/8 side span,the presetting-height of mid-span position and the thickness of concrete pavement layer at the top of side pier and the vertical weighted acceleration root mean square of vehicle seat was analyzed.According to the analysis results,some measures are put forward to improve the bridge deck linear smoothness by adjusting the presetting-height of 3L/8 side span,the presetting-height of mid-span position and the thickness of concrete pavement layer(leveling layer)at the top of side pier,which can improve driving comfort.In the stage of bridge deck pavement,the pavement linear should be fitted according to the original preset bridge linear,while taking into account the driving comfort.