1. Associate Professor, The Via Dept. of Civil and Environmental Engineering, Virginia Tech., 200 Patton Hall, Blacksburg, VA24061-0105. E-mail: flintsch@vt.edu
2. Graduate Research Assistant, The Via Dept. of Civil and Environmental Engineering, Virginia Tech., 200 Patton Hall, Blacksburg, VA 24061-0105. E-mail: chenchen@vt.edu