1. Graduate Student, Dept. of Civil Engineering, 110 Lowry Hall, Clemson Univ., Clemson, SC 29634.
2. Associate Professor, Dept. of Civil Engineering, 218 Lowry Hall, Clemson Univ., Clemson, SC 29634 (corresponding author).
3. Assistant Professor, Dept. of Civil Engineering, 314 Lowry Hall, Clemson Univ., Clemson, SC 29634.