1. Graduate Student, Glenn Dept. of Civil Engineering, Clemson Univ., 110 Lowry Hall, Clemson, SC 29634-0911.
2. Professor, Glenn Dept. of Civil Engineering, Clemson Univ., 218 Lowry Hall, Clemson, SC 29634-0911 (corresponding author).
3. Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., 110 Lowry Hall, Clemson, SC 29634-0911.