Affiliation: | 1. ISISE, Department of Civil Engineering, University of Minho, Guimar?es, Portugal;2. Department of Civil Engineering, School of Engineering, Polytechnic Institute of Porto, Porto, Portugal;3. Núcleo de Engenharia Sísmica e Dinamica de Estruturas, Departamento de Estruturas, LNEC - Laboratório Nacional de Engenharia Civil, Lisboa, Portugal |