1. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts, 235B Marston Hall, 130 Natural Resources Rd., Amherst, MA 01003–9293. E-mail: civjan@ecs.umass.edu
2. Engineer, Simpson Gumpertz and Heger Inc., 41 Seyon St., Bldg. 1, Suite 500, Waltham, MA 02453.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts, 235B Marston Hall, 130 Natural Resources Rd., Amherst, MA 01003–9293.
4. Assistant Professor, Univ. of California, Davis, 3101 Engineering III, One Shields Ave., Davis, CA 95616.
5. Assistant Bridge Engineer, Massachusetts Highway Dept., 10 Park Plaza, Boston, MA.