1. Bridge Engineer, Montana Dept. of Transportation, 2701 Prospect Ave., Helena, MT 59620-1001.
2. Assistant Professor, Civil Engineering, Montana State Univ., Bozeman, MT 59717 (corresponding author).
3. Graduate Research Assistant, Civil Engineering, Montana State Univ., Bozeman, MT 59717.
4. Professor, Civil Engineering, Montana State Univ., Bozeman, MT 59717.
5. Chief Bridge Engineer, Montana Dept. of Transportation, 2701 Prospect Ave., Helena, MT 59620-1001.