1. Associate Members, ASCE
2. Grad. Student, Dept. of Civ. and Envir. Engrg., Univ. of California, Berkeley, CA 94720-1710.
3. Asst. Prof., Dept. of Civ. and Envir. Engrg., 721 Davis Hall, No. 1710, Univ. of California, Berkeley, CA 94720-1710. E-mail: boza@ce. berkeley.edu