Dynamic Load Analysis Of Five-axle Semi-trailer Run On The Curved Surface Slope Road

At present in the pavement design method of our country and the rest of the world,the vehicle load is being regarded as static load or the approximate equivalentstaticload.This is appropriated when the speed is low, and the load is small.However, as thenational highway transportation network densification, transport vehicles develop in thedirection of faster and heavier, if you still put the vehicle load as static load or theapproximate equivalent static load cannot reflect the actual stress condition of thepavement, and cannot explain the various phenomenon of the pavement structure underdynamic loads. There is a lot of research on vehicle dynamic loads on the flat surfaceroad, but for the plateau hilly region, roads including highways are curved slope road,dynamic load of vehicles who are driven on the curved ramp is quite different to the onewho are driven on flat roads. So study on dynamic loads of vehicles who are driven incurved slope pavement, can provide plateau hilly region highway pavement design withreasonable vehicle load, do a good job of preparation for the dynamic design methodand design code for pavement.Exampled by a certain type of common in western areas of China faw five axissemi-trailer as the research object, and11degrees of freedom vehicle model isestablished in the paper. Through force analysis, obtained the hang out of the five axissemi-trailer on curved slope road surface when the move load formula, findout the mainfactors influencing the dynamic load. And established vehicle dynamics model and thecurved slope of different slope and turning radius road file in the ADAMS/Car, got fiveaxle semi-trailer travels on the curved ramp generate dynamic load changing law withvarious influencing factors through the simulation analysis.Studies have shown that the tyre dynamic load of each axle coefficient and slope isroughly linear relationship, and the bend radius is roughly hyperbolic relation, and thespeed curve roughly quadratic curve, and quality of load curve roughly conic, roughlylinear relationship with load mass height, with a wheelbase basic linear relationship. Soreduce the bend on the surface of the ramp slope, increase the bending slope pavementturning radius, reducing road roughness and the speed,appropriately increased loadunder the condition of the static load is not overloaded, reduce the load mass level,Appropriate increase the wheelbase is effective measures to reduce the vehicle dynamicload. Also found a car travels in curved slope road surface, the tractor rear axle shaft2 and3axis dynamic load change is bigger, so we can consider increasing the tractor rearaxle shaft when designing vehicles to reduce the axial dynamic load.