Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Distribution of Permanent Deformations within HMA Layers
Current mechanistic-empirical rutting models relate permanent strains to resilient strains. However, the influence of layer thickness on the predicted rutting based on these resilient strains is in sharp disagreement with field observations. Thickness or depth correction factors are required to bring predictions into agreement with observations. Nonlinear elastoplastic finite element analyses of representative generic pavement structures are employed to provide qualitative and quantitative insights into this and related issues. Specific findings include: (a) horizontal stresses predicted by the elastoplastic analyses remain compressive at all times—i.e., the material at the bottom of the HMA layer is not in tension as predicted from multilayer elastic analyses but is yielding under triaxial confined compression conditions; (b) the residual strain variations with depth computed from the elastoplastic analyses are qualitatively similar to measurements from field pavements without resort to any empirical depth or thickness correction functions; and (c) the elastoplastic finite element analyses can directly predict surface heave outside the wheel path, which at best is included in mechanistic-empirical rutting models only through the field calibration factors. Concluding suggestions are included for a conceptual approach for enhancing mechanistic-empirical rutting prediction models.
Distribution of Permanent Deformations within HMA Layers
Current mechanistic-empirical rutting models relate permanent strains to resilient strains. However, the influence of layer thickness on the predicted rutting based on these resilient strains is in sharp disagreement with field observations. Thickness or depth correction factors are required to bring predictions into agreement with observations. Nonlinear elastoplastic finite element analyses of representative generic pavement structures are employed to provide qualitative and quantitative insights into this and related issues. Specific findings include: (a) horizontal stresses predicted by the elastoplastic analyses remain compressive at all times—i.e., the material at the bottom of the HMA layer is not in tension as predicted from multilayer elastic analyses but is yielding under triaxial confined compression conditions; (b) the residual strain variations with depth computed from the elastoplastic analyses are qualitatively similar to measurements from field pavements without resort to any empirical depth or thickness correction functions; and (c) the elastoplastic finite element analyses can directly predict surface heave outside the wheel path, which at best is included in mechanistic-empirical rutting models only through the field calibration factors. Concluding suggestions are included for a conceptual approach for enhancing mechanistic-empirical rutting prediction models.
Distribution of Permanent Deformations within HMA Layers
Schwartz, Charles W. (Autor:in) / Carvalho, Regis L. (Autor:in)
Airfield and Highway Pavements 2008 ; 2008 ; Bellevue, Washington, United States
Airfield and Highway Pavements ; 86-98
10.10.2008
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Distribution of Permanent Deformations within HMA Layers
| British Library Conference Proceedings | 2008
Study of permanent deformations in asphalt concrete layers
| British Library Conference Proceedings | 2002
Permanent deformations in asphalt concrete layers in Brazil
| British Library Conference Proceedings | 2003
A simplified method of prediction of permanent deformations of unbound pavement layers
| British Library Conference Proceedings | 2004
Seismic Permanent Deformations in Earth Dams
| NTIS | 1974