1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts Amherst, 235A Marston Hall, 130 Natural Resources Rd., Amherst, MA 01003.
2. Engineer, Simpson, Gumpertz & Heger, Inc., 41 Seyon St., Bldg. 1, Suite 500, Waltham, MA 02453.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts Amherst, 235B Marston Hall, 130 Natural Resources Rd., Amherst, MA 01003.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of California Davis, 3101 Engineering III, One Shields Ave., Davis, CA 95616.
5. Assistant Bridge Engineer, Massachusetts Highway Dept., 10 Park Plaza, Room 6430, Boston, MA 02116.