1. Grad. Student, Dept. of Applied Mechanics and Engrg. Sci., Univ. of Michigan, Ann Arbor, Mich., presently at General Motors, Warren, Mich.
2. Prof., Dept. of Civ. Engrg., Northwestern Univ., Evanston, Ill.
3. Assoc. Prof., Dept. of Civ. Engrg., Univ. of Michigan Ann Arbor, Mich.