1. Professor, Dept. of Civil and Environmental Engineering, Univ. of Michigan, 113 EWRE, Ann Arbor, MI 48109-2125.
2. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Michigan, Ann Arbor, MI 48109.
3. Assistant Professor, Dept. of Civil Engineering, Auburn Univ., 238 Harbert Engineering Center, Auburn, AL 36844.