1. Post Graduate Student, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48823.
2. Assistant Professor, Dept. of Civil Engineering, Shahid Chamran Univ. of Ahvaz, Ahvaz 6135741135, Iran (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48823.