1. Postdoctoral Research Fellow, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Houston, N107 Engineering Building 1, Houston, TX 77204-4003 (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.
4. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Houston, Houston, TX 77204-4003.