The development of pavement performance models is a critical component of a multi-year analysis within a pavement management system (PMS).The paper describes an empirical-mechanistic roughness progression model, as function of loads, climate conditions, structural layout, overall construction quality and material properties that has been implemented in a computer program. The analysis is performed by dividing the road section into 0.30 m long sub-sections. Material properties and layers thickness’ variations are described through a second order autoregressive process and assigned to each sub-section. A starting profile is randomly assigned to road section basing on construction specifications. The computer simulation is performed through an step-by-step process; during each time step the program calculates the dynamic loads, the stress and the permanent deformation induced by 16 types of heavy vehicles in each sub-section, according to 8 daily climatic conditions (every three hours). At the end of the step, the total rutting and the degradation of asphalt modulus due to fatigue cracking is calculated for each sub-section, the profile is updated and the IRI index of the road section is evaluated. Roughness deterioration curves derived in such manner highlight that daily temperature variations seems to play a critical role in the evaluation of roughness and rutting progression. Furthermore, a comparison with curves developed through empirical models proposed by world bank has shown a fairly good agreement.
Nicolosi, V., D'Apuzzo, M. (2002). Development of semi-mechanistic roughness performance model by computer simulation edited by Farad Khosrowshahi , London november 2002.. ??????? it.cilea.surplus.oa.citation.tipologie.CitationProceedings.prensentedAt ??????? 3rd International conference decision making in urban and civil engineering (DMUCE), London.
Development of semi-mechanistic roughness performance model by computer simulation edited by Farad Khosrowshahi , London november 2002.
NICOLOSI, VITTORIO;
2002-11-01
Abstract
The development of pavement performance models is a critical component of a multi-year analysis within a pavement management system (PMS).The paper describes an empirical-mechanistic roughness progression model, as function of loads, climate conditions, structural layout, overall construction quality and material properties that has been implemented in a computer program. The analysis is performed by dividing the road section into 0.30 m long sub-sections. Material properties and layers thickness’ variations are described through a second order autoregressive process and assigned to each sub-section. A starting profile is randomly assigned to road section basing on construction specifications. The computer simulation is performed through an step-by-step process; during each time step the program calculates the dynamic loads, the stress and the permanent deformation induced by 16 types of heavy vehicles in each sub-section, according to 8 daily climatic conditions (every three hours). At the end of the step, the total rutting and the degradation of asphalt modulus due to fatigue cracking is calculated for each sub-section, the profile is updated and the IRI index of the road section is evaluated. Roughness deterioration curves derived in such manner highlight that daily temperature variations seems to play a critical role in the evaluation of roughness and rutting progression. Furthermore, a comparison with curves developed through empirical models proposed by world bank has shown a fairly good agreement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.