1. Graduate Research Assistant, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911.
2. Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911 (corresponding author).
3. Technical Principal and Vice President, S&ME, Inc., 620 Wando Park Blvd., Mount Pleasant, SC 29464.