随机荷载作用下刚性路面动态响应研究  

Dynamic response of a rigid pavement under random loads

作　　者：张献民[1] 胡鹏[1] 

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《振动与冲击》2015年第19期126-130,137,共6页Journal of Vibration and Shock

基　　金：河北省交通科学基金(Y-20122033)

摘　　要：为了研究车辆随机荷载作用下刚性路面的动态响应,基于ANSYS软件,应用1/4车辆模型,得出其在路面不平度激励下的随机荷载,简化了荷载的求解,建立了路面三维有限元模型,讨论了在随机荷载作用下结构层参数对路面动位移幅值及面层层底拉应力幅值的影响规律。结果表明,面层厚度和土基模量对路面动位移幅值影响最大,当面层厚度超过30 cm、土基模量超过60 MPa时,继续增大以上结构层参数路面动位移幅值不再有明显减少;当土基模量小于60MPa继续减少时,要实现路面动位移幅值的不变,需要增加的面层厚度幅度逐渐变大;面层模量及厚度对面层层底拉应力幅值影响最大。In order to study the dynamic response of a rigid pavement under vehcle random loads,a vehicle random load excited by pavement surface roughness was obtained with application of a 1 /4 vehicle model based on ANSYS,the load-solving was simplified. Then,a 3D finite element model of the pavement was established to discuss the influences of structural parameters on the maximum dynamic displacement and the maximum bottom tensile stress of the surface layer under the random load. The calculated results indicated that subgrade modulus and surface layer thickness have significant effects on the maximum dynamic displacement; when the surface layer thickness is more than 30 cm,the subgrade modulus is more than 60 MPa,continuously increasing these parameters can not cause the maximum dynamic displacement to decrease obviously; when the subgrade modulus is less than 60 MPa,it needs a gradual increase in surface layer thickness to keep the maximum dynamic displacement from changing while the subgrade modulus decreases; the surface layer modulus and thickness have the largest influence on the maximum bottom tensile stress of the surface layer.

关 键 词：道路工程 刚性路面 三维有限元 结构层参数 随机荷载 动位移幅值 层底拉应力幅值 

分 类 号：U416.222[交通运输工程—道路与铁道工程]