1. Professor, Dept. of Civil & Environmental Engineering, Faculty of Engineering & Architecture, American Univ. of Beirut, P. O. Box: 11-0236, Riad el-Solh 1107 2020, Beirut, Lebanon (corresponding author). E-mail: habib@aub.edu.lb
2. Civil Engineer, Khatib & Alami (CEC), Beirut, Lebanon. E-mail: lnm02@aub.edu.lb