1. Assistant Research Fellow, Sustainable Environment Research Center, National Cheng Kung Univ., Taiwan 701; formerly, Postdoctoral Fellow, Dept. of Civil Engineering, Clemson Univ., Clemson, SC.
2. Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911 (corresponding author).
3. Research Assistant, Dept. of Civil Engineering, Clemson Univ., Clemson, SC 29634-0911.
4. Associate Professor, Dept. of Civil and Environmental Engineering, MC-250, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801.