1. Postdoctoral Associate, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., 1-180, Cambridge, MA 02139 (corresponding author).
2. Professor, Dept. of Civil and Environmental Engineering, City College of New York, Steinman Hall T-121, Convent Ave. at 140th St., New York, NY 10031.
3. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Purdue Univ., West Lafayette, IN 47907.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.
5. Ph.D. Student, Dept. of Civil and Environmental Engineering, Advanced Technology for Large Structural Systems Center, Lehigh Univ., Bethlehem, PA 18015.
6. Professor, Dept. of Mechanical Engineering, Purdue Univ., West Lafayette, IN 47907.
7. Nathan M. and Anne M. Newmark Endowed Chair of Civil Engineering, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
8. Professor, Dept. of Civil and Environmental Engineering, Advanced Technology for Large Structural Systems Center, Lehigh Univ., Bethlehem, PA 18015.
9. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Connecticut, Storrs, CT 06269.