1. Member, ASCE
2. P.E., Member, ASCE
3. Asst. Prof., Dept. of Mech. Engrg., California Polytechnic State Univ., San Luis Obispo, San Luis Obispo, CA 93407.
4. Asst. Prof., Dept. of Civ. and Envir. Engrg., Michigan State Univ., East Lansing, MI 48824.
5. Prof. and Chair, Dept. of Struct. Engrg., Univ. of California, San Diego, La Jolla, CA 92093.