1. Dept. of Civil and Environmental Engineering and Architecture (DICATeA), Univ. of Parma, Viale G. P. Usberti 181/A, 43100 Parma, Italy (corresponding author).
2. School of Mechanical, Aerospace, and Civil Engineering, Univ. of Manchester, Manchester, U.K.
3. Dept. of Civil and Environmental Engineering and Architecture (DICATeA), Univ. of Parma, Viale G. P. Usberti 181/A, 43100 Parma, Italy.