1. Assistant Professor, Dept. of Civil, Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104 (corresponding author). E-mail: jw64@drexel.edu
2. Graduate Student Researcher, Dept. of Civil, Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.