1. Professor, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El-Solh 1107-2020, Lebanon.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El-Solh 1107-2020, Lebanon (corresponding author).
3. Graduate Student, Dept. of Civil and Environmental Engineering, American Univ. of Beirut, P.O. Box 11-0236, Riad El-Solh 1107-2020, Lebanon.