1. Fellow, ASCE
2. Member, ASCE
3. Walter P. Murphy Prof. of Civ. Engrg. and Mat. Sci., Northwestern Univ., Evanston, IL 60208. E-mail: z-bazant@nwu.edu
4. Grad. Student, Dept. of Civ. Engrg., Northwestern Univ., Evanston, IL.
5. Prof. of Civ. Engrg., Columbia Univ., New York, NY 10027.