1. Research Professor, Polytechnic Institute of NYU, Brooklyn, NY, and Professor, School of Civil Engineering, Univ. of Tehran, Tehran, Iran.
2. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO (corresponding author).
3. Ph.D., Assistant Professor, School of Civil and Environmental Engineering, Tarbiat Moalem Univ., Tehran, Iran.