1. Formerly, Graduate Assistant, Dept. of Civil Engineering, Univ. of Akron, Akron, OH 44325.
2. Graduate Assistant, Dept. of Civil Engineering, Univ. of Akron, Akron, OH 44325.
3. Formerly, Graduate Assistant, Dept. of Civil Engineering, Ohio Univ., Athens, OH 45701.
4. Associate Professor, Dept. of Civil Engineering, Ohio Univ., Athens, OH 45701.
5. Professor, Dept. of Civil Engineering, Univ. of Akron, Akron, OH 44325 (corresponding author).