1. Assistant Professor, Laboratory of Mechanics and Modelling of Materials and Structures in Civil Engineering, Univ. of Limoges, Boulevard Derche, 19300 Egletons, France.
2. Engineer, Division Matériaux et Structures de Chaussées, Laboratoire Central des Ponts et Chaussées, Route de Bouaye BP4129, 44341 Bouguenais cedex, France.
3. Assistant Professor, National Institute of Applied Sciences (INSA), Boulevard de la Victoire, 67000 Strasbourg, France.