1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Highway and Transportation Div., Amirkabir Univ. of Technology, No. 424, Hafez Ave., Tehran 15914, Iran (corresponding author).
2. Associated Professor, Dept. of Civil and Environmental Engineering, Amirkabir Univ. of Technology, No. 424, Hafez Ave., Tehran 15914, Iran.