1. Graduate Research Assistant, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634.
2. Liles Associate Professor and Jr. Distinguished Associate Professor, Glenn Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634 (corresponding author).
3. Harry and Arlene Schell Professor, Head of the Dept. of Architectural Engineering, Pennsylvania State Univ., State College, PA 16801.