1. Ph.D. Candidate, Dept. of Civil Engineering, 102 Stocker Engineering Center, Ohio Univ., Athens, OH 45701.
2. Russ Professor, Dept. of Civil Engineering, 208 Stocker Engineering Center, Ohio Univ., Athens, OH 45701.
3. Assistant Professor, Dept. of Civil Engineering, 222 Stocker Engineering Center, Ohio Univ., Athens, OH 45701.