1. Ph.D. Candidate and Research Assistant, Dept. of Civil and Environmental Engineering, Norwegian Univ. of Science and Technology, Trondheim 7491, Norway (corresponding author).
2. Professor, Faculty of Civil and Environmental Engineering, Tarbiat Modares Univ., Al Ahmad St., No. 7, Tehran 14115-111, Iran.
3. Ph.D. Candidate and Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Texas at San Antonio, San Antonio, TX 78249.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Texas at San Antonio, San Antonio, TX 78249.