1. Ph.D. Candidate, ISISE, Dept. of Civil Engineering, Univ. of Minho, Guimaraes, Portugal, 4800-058; formerly, Dept. of Civil and Environmental Engineering, Tarbiat Modares Univ., Tehran, Iran.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Tarbiat Modares Univ., Tehran, Iran (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Tarbiat Modares Univ., Tehran, Iran.