Comparative Analysis of Damage between Load Spectra Generated based on Pavement Grade and Load Spectra of Actual Test Site Pavement

With the continuous improvement of vehicle performance, the demand for accurate simulation and damage assessment of pavement load spectra is increasing. This paper aims to evaluate the consistency and difference between the load spectra generated based on pavement grade and the load spectra of the actual test site in vehicle damage simulation. The study first reviews the characterization methods of pavement roughness, especially the concept of spatial power spectral density (PSD) and its application in pavement grade classification. Subsequently, the corresponding load spectrum time domain model was constructed according to the pavement grade specified by the national standard using Matlab/Simulink software , and the actual pavement load spectrum was obtained based on the correlation of the four-wheel load of the whole vehicle. In addition , the actual pavement load spectrum was generated by pavement load data collected in the actual test site. By analyzing the time domain, frequency domain and statistics of the two load spectra , their similarities and differences in the simulation of vehicle driving were compared. The research results show that the load spectrum generated based on the pavement grade is similar to the actual pavement load spectrum in statistical characteristics. Although there are some differences in details, these differences have little effect on the damage assessment of the vehicle , which provides a basis for establishing a bench load spectrum directly based on the pavement grade.