1. Associate Professor, Dept. of Civil Engineering, Ohio Univ., Athens, OH 45701 (corresponding author).
2. Graduate Student, Dept. of Civil Engineering, Ohio Univ., Athens, OH 45701.
3. Associate Professor, Dept. of Civil Engineering, Ohio Univ., Athens, OH 45701.
4. Professor, Dept. of Civil Engineering, Univ. of Akron, Akron, OH 44325-3905.
5. Professor, School of Electrical Engineering and Computer Science, Ohio Univ., Athens, OH 45701.