1. Department of Continuum Mechanics and Structures, E.T.S. Ingenieros de Caminos, Canales y Puertos. Universidad Politécnica de Madrid, Madrid, Spain
2. Department of Continuum Mechanics and Structural Analysis, Universidad de Sevilla, Seville, Spain
3. Vibration Engineering, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK