In order to provide references to vertical alignment design for major and intermediate maintenance and reconstruction and extension of expressways, the vehicle-road interaction analysis model with five degrees of freedom was adopted. With vehicles represented by mini car and bus, the vertical vibration accelerations were obtained by a MATLAB program compiled according to Newmark-β method. In terms of criterion ISO 2631-1, the weighted root-mean-square (RMS) acceleration was adopted as the evaluation index. The laws of vehicle-road interaction under the condition of uneven settlement of step mode, polyline mode and exponential mode were investigated. The influences of road profile design indexes such as slope length, slope difference and radius of vertical curve on driving comfort were analyzed. Finally, a practical case of Hangzhou-Ningbo Expressway extension project was also performed. The results show that the larger the driving speed of vehicle is, the greater the vibration acceleration gains caused by the uneven settlement of road under the same condition. The driving comfort is reduced with the increase of height of step mode and slope of polyline and exponential mode. In order to keep comfort, for high-grade expressways, the height of step mode should not be more than 1cm, the slope difference of polyline mode should not be more than 0.3%, and the control standard of exponential mode should be stricter. Driving comfort is not directly affected by the value of slope and slope length. With the decrease of slope difference and the increase of radius of vertical curve, the driving comfort is improved. When site conditions are limited in road reconstruction and extension project, on the premise of sight distance, after demonstration, the limitation of the most small slope length specified in design specification for expressway alignment can be pushed properly, and vertical alignment can be designed according to requirements of driving comfort.
Key words
road engineering /
profile alignment design /
vehicle-road interaction analysis model /
uneven settlement /
weighted RMS acceleration
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