1. Department of Civil Engineering; University of Minho, Campus de Azurém; 4800-058 Guimarães Portugal
2. Department of Civil Engineering; University of Aveiro, Campus Universitário de Santiago; 3810-193 Aveiro Portugal
3. Department of Civil Engineering; University of Coimbra, Rua Luís Reis Santos - Pólo II; 3030-788 Coimbra Portugal