1. Laboratory of Strength Materials, IUAV Univ. of Venice, Via Torino 153/A, 30172 Mestre, Venice, Italy (corresponding author).
2. Professor, School of Engineering, Univ. of Warwick, Coventry CV4 7AL, U.K.
3. Associate Professor, Structural Civil Engineering, Dept. of Construction, IUAV Univ. of Venice, Dorsoduro 2206, Venice 30123, Italy.