1. Research Associate, Dept. of Civil, Environmental and Geomatic Engineering, Univ. College London, London WC1E 6BT, U.K.
2. Assistant Professor, Dept. of Structures for Engineering and Architecture, Univ. of Naples Federico II, via Claudio, 21, 80125 Naples, Italy (corresponding author).
3. Full Professor, Dept. of Structures for Engineering and Architecture, Univ. of Naples Federico II, via Claudio, 21, 80125 Naples, Italy.