1. Ph.D. Candidate, Dept. of Civil Engineering, Stocker Center, Ohio Univ., Athens, OH 45701 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Stocker Center, Ohio Univ., Athens, OH 45701.
3. Russ Professor, Dept. of Civil Engineering, Stocker Center, Ohio Univ., Athens, OH 45701.
4. Professor, Dept. of Civil Engineering, Stocker Center, Ohio Univ., Athens, OH 45701.