1. Member, ASCE
2. Asst. Prof., Dept. of Struct. Engrg., Univ. of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085. E-mail: sashford@ucsd.edu
3. Grad. Student Res., Dept. of Struct. Engrg., Univ. of California, San Diego, La Jolla, CA 92093-0085.