1. Prof. of Civ. Engrg., Univ. of California, Berkeley, Ualif
2. Assoc. Prof., School of Engrg. & Applied Sci., Univ. California, Los Angeles, Calif
3. Assoc. Woodward-Lundgren & Assocs., Oakland, Calif., and Asst. Research Engr., Univ. of California, Berkeley, Calif
4. Grad. Research Asst., Dept. of Civ. Engrg., University of California Berkeley, Calif