1. Assistant Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911 (corresponding author).
2. A.P. and Florence Wiley Chair Professor and Department Head, Zachry Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
3. Postdoctoral Research Associate, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, CO 80523-1372.
4. Associate Professor, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, CO 80523-1372.