1. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, 3141 Ghausi Hall, Davis, CA 95616.
2. Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Engineering Bldg, Room 813, Univ. of New Orleans, 2000 Lakeshore Dr., New Orleans, LA 70148.