1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, Piscataway, NJ 08854-8018.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, Piscataway, NJ 08854-8018 (corresponding author).
3. Associate Professor, Civil and Environmental Engineering, Univ. of Wisconsin, Milwaukee, WI 53201-0784.