1. PhD Candidate, Dept. of Civil Engineering, Sharif Univ. of Technology, Azadi Ave., Tehran, Iran.
2. Professor, Dept. of Civil and Environmental Engineering, New Jersey Institute of Technology, Univ. Heights, Newark, NJ 07102 (corresponding author).
3. Assistant Professor, Dept. of Civil Engineering, Sharif Univ. of Technology, Azadi Ave., Tehran, Iran.