路面板固化翘曲对车辆动荷载和行驶舒适性的影响  

Effects of a slab's built-in curling on dynamic load and riding comfort of vehicles

作　　者：胡昌斌[1] 孙增华[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《振动与冲击》2014年第23期1-8,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50908056;51478122)

摘　　要：路面板由于施工早龄期阶段显著的板顶干缩和凝固温度作用会形成一个始终向上的固化翘曲,基于1/4车辆模型,叠加固化翘曲、环境温度和路面等级对路面随机不平度的共同作用,采用车路动力分析方法研究了固化翘曲对车辆随机动荷载和行驶舒适性的影响。研究表明:固化翘曲对较高平整度等级路面平整度和随机动荷载影响较为显著,主要影响与(板长/车速)相关频率处的路面不平度和车辆随机动荷载参数值。固化翘曲与环境场温度梯度叠加会产生向上或向下翘曲两种情况,面板向上翘曲对路面不平整度和随机动荷载影响较大,向下翘曲则影响很小,但翘曲总体相比路面等级、车辆参数、车速对行车舒适性的影响小。基于该方法可同理分析三辊轴施工形成的更小尺度面板不平整波影响,分析表明该不平整波激振影响的基频值更高,比面板翘曲影响更显著。建议施工尽量控制面板固化翘曲与环境温度组合温度差在-10℃以下,避免辊轴波的出现。Concrete pavement slab may get a significant built-in curling due to dry shrinkage and built-in temperature gradient at its initial stage. Here,effects of built-in curling of the slab on dynamic load and riding comfort of vehicles were analyzed based on a quarter vehicle vibration model and the road-vehicle dynamic interaction analysis method. The results showed that the built-in curling has more effects on roughness and random dynamic load of a highergrade pavement,it mainly affects road roughness and vehicle random dynamic load parameters related to frequency of（ slab length /speed）; built-in curling and environmental temperature gradient produce upward or downward curling,slab upward curling has a larger influence on pavement roughness and random dynamic load,but down warping has little effect; riding comfort,pavement grade,vehicle parameters and vehicle speed have more significant effects on riding comfort than built-curling does. Three-roll shaft construction＇s built-in curling shape has a stronger effect than asiab＇s built in curling does; effective built-in temperature difference keeping below-10 ℃ may lead to a good performance of pavement slab.

关 键 词：水泥混凝土路面 固化翘曲 不平度 车辆动荷载 舒适性 

分 类 号：U416[交通运输工程—道路与铁道工程]