[en] Impact of dynamic axle loading on the service life of flexible pavements The study of pavement maintenance strategies has gained great importance in recent years, both because of the drastic decrease in investments for the maintenance of road infrastructures and because of the benefits associated with the performance of such preventive maintenance. This doctoral thesis uses a methodology focused on the study of the impact of preventive maintenance strategies on the service life of flexible pavements, taking into account the effect of dynamic rolling loads. The first part of the methodology focuses on calculating the fatigue failure of a flexible pavement considering the effect of dynamic axle loads. For this purpose, a multilayer elastic model is first developed to calculate the mechanical responses of the firm. Then, a structural failure model of the pavement and its fatigue failure criteria are defined. The second part of the methodology focuses on the role of dynamic axle loads in the fatigue failure of the pavement. First, the methodology for calculating these dynamic axle loads using a quarter heavy vehicle model is presented, which requires the computational simulation of a longitudinal road profile. Finally, a deterioration model of surface evenness is presented, thanks to which it is possible to simulate the time evolution of this surface evenness, and therefore, the time evolution of the dynamic axle loads during the pavement service life. Finally, the algorithm used is presented, as well as the reduced model of this algorithm and its implementation in a software that allows to calculate the effect of different preventive maintenance strategies on the service life of a flexible pavement.

[gl] Impacto das cargas dinámicas na vida útil dos pavimentos flexíbeis O estudo das estratexias de conservación de firmes cobrou gran importancia nos últimos anos, tanto polo declive drástico nos investimentos para o mantemento das infrastructuras viarias coma polos beneficios asociados á realización de dito mantemento preventivo. Na presente tese doutoral lévasne a cabo unha metodoloxía centrada no estudo do impacto sobre a vida útil dos firmes flexíbeis das estratexias de mantemento preventivo, tendo en conta o efecto das cargas dinámicas de rodadura. A primeira parte da metodoloxía empregada céntrase en calcular o fallo a fatiga dun firme flexíbel considerando o efecto das cargas dinámicas de rodadura. Para dito fin, primeiramente desenvólvese un modelo elástico multicapa para calcular as respostas mecánicas do paquete de firme. Deseguido defínese un modelo de comportamento deste paquete de firme e o seu criterio de fallo por fatiga. A segunda parte da metodoloxía céntrase no papel que desempeñan as cargas dinámicas de rodadura no fallo por fatiga do paquete de firme. En primeiro lugar preséntase a metodoloxía para calcular ditas cargas dinámicas de rodadura empregando un modelo de cuarto de vehículo pesado, a cal require da simulación computacional dun perfil lonxitudinal de estrada. Finalmente preséntase un modelo de deterioración de regularidade superficial, grazas ao cal pódese simular a evolución temporal de dita regularidade superficial, e polo tanto, a evolución temporal das cargas dinámicas de rodadura durante a vida útil do firme. Finalmente preséntase o algoritmo empregado, así como o modelo reducido deste algoritmo e a súa implementación nun software que permite calcular o efecto de diferentes estratexias de mantemento preventivo na vida útil dun firme flexíbel.