1. Ph.D. Candidate, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
2. Cottingham Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC.
3. Associate Professor, Glenn Dept. of Civil Engineering, Dept. of Materials Science and Engineering, Clemson Univ., Clemson, SC (corresponding author).