1. Ph.D. Candidate, Dept. of Civil, Architectural, and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, Pennsylvania 19104. E-mail: sh338@drexel.edu
2. J. Harland Billings Professor, Dept. of Mechanical Engineering and Mechanics, Drexel Univ., 3141 Chestnut St., Philadelphia, Pennsylvania 19104. E-mail: bfarouk@coe.drexel.edu
3. L.D. Betz Professor and Department Head, Dept. of Civil, Architectural, and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, Pennsylvania 19104 (corresponding author). E-mail: haascn@drexel.edu