1. Graduate Research Assistant, Glenn Dept. of Civil Engineering, Clemson Univ., 306 S. Palmetto Blvd., Clemson, SC 29634 (corresponding author).
2. Cottingham Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
3. Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
4. Professor and Associate Dean for Research, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208.