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(Automatic translation)

Comprehensive model for fatigue analysis of flexible pavements considering effects of dynamic axle loads

Fermín NAVARRINA
Catedrático de Universidad

Luis RAMÍREZ
Profesor Ayudante Doctor

José PARÍS
Profesor Titular de Universidad

Xesús NOGUEIRA
Profesor Titular de Universidad

Ignasi COLOMINAS
Catedrático de Universidad

Manuel CASTELEIRO
Catedrático de Universidad

Manuel RUIZ

Investigador STAREBEI

José R. FERNÁNDEZ DE MESA
Director Holding Eurovía Spain
Group of Numerical Methods Higher Technical School of Engineers 
Caminos, Canales y Puertos. Universidad de A Coruña (15192 - A Coruña)

ABSTRACT

The main objective of this work is to quantify the reduction in the structural service life of the pavement due to the rise of the dynamic axle loads exerted by the traffic, as the progressive deterioration of the road profile occurs. First, the procedure for the fatigue analysis of flexible pavements, as defined in the Spanish Standard 6.1-IC, is explained in detail. Second, the concepts of accumulated damage and structural service life are formalized in mathematical terms. Next, dynamic axle loads are introduced, which leads to the definition of a suitable accumulated fatigue damage indicator that takes into account these effects. Dynamic axle loads are introduced by means of a so-called effective dynamic load amplification factor, for which quantification the Quarter-Car model is extended. The formulation is completed by adding a simple procedure for simulating how the road profile deteriorates over time. Finally, an application example is presented.

KEYWORDS

IRI, Flexible pavement design, Dynamic axle load, Accumulated damage indicator, Pavement structural service life.

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