1. Postdoctoral Researcher, Dept. of Civil, Structural and Environmental Engineering, State Univ. of New York at Buffalo, Buffalo, NY 14260 (corresponding author).
2. Professor, Dept. of Civil, Structural and Environmental Engineering, State Univ. of New York at Buffalo, Buffalo, NY 14260; Institute of Advanced Study IUSS, 27100 Pavia, Italy.
3. Principal, Simpson Gumpertz & Heger, 41 Seyon St., Waltham, MA 02453.
4. Associate Professor, Dept. of Architectural Engineering, California Polytechnic State Univ., San Luis Obispo, CA 93407.