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为了研究车辆随机荷载作用下沥青路面的动力响应,建立了车辆随机振动模型和车辆随机激励下基层-面层双粘弹性沥青路面动力响应模型,并采用Fourier变换与小波变换相结合的新方法求得了路面随机响应解析解。根据实际车辆参数及道路参数,以路面不平度为初始激励,仿真得到了车辆随机荷载的功率谱密度函数和自相关函数,分析了沥青路面在车辆荷载下的随机动力响应特性,计算了沥青路面动力响应的主要数字特征函数,同时还对沥青路面随机动力响应进行了可靠性设计。结果表明:沥青路面动力响应的均值函数与路面等级无关,而自相关函数、功率谱密度函数及标准差均随着路面等级的下降而增加;采用提出的方法确定不同可靠度下不同等级沥青路面的动力响应值,可避免采用静载荷作为路面设计荷载的不合理性,为沥青路面的可靠性设计与分析提供参考。
In order to study the dynamic response of asphalt pavement under random load of vehicles, the model of vehicle random vibration and the dynamic response model of base double-viscoelastic asphalt pavement with random excitation are established and a new method based on Fourier transform and wavelet transform is proposed Got pavement random response analytical solution. According to the actual vehicle parameters and road parameters, the road surface roughness is taken as the initial excitation, the power spectral density function and autocorrelation function of the vehicle random load are simulated, and the random dynamic response characteristics of the asphalt pavement under the vehicle load are analyzed. Dynamic response of the main digital eigenfunction, but also on the asphalt pavement random dynamic response reliability design. The results show that the mean function of dynamic response of asphalt pavement has nothing to do with the grade of pavement, but the autocorrelation function, power spectral density function and standard deviation all increase with the decreasing of pavement level. The proposed method is used to determine the asphalt pavement with different grades of reliability The dynamic response value can avoid using the static load as the irrational load of pavement design and provide references for the design and analysis of the reliability of asphalt pavement.