1. PhD, SE, Structural Engineer, Palmer Engineering, Winchester, KY 40392-0747.
2. Professor, Dept. of Civil Engineering, Univ. of Kentucky, 161A Raymond Building, Lexington, KY 40506-0281 (corresponding author).
3. Professor, Dept. of Civil Engineering, Univ. of Kentucky, 161A Raymond Building, Lexington, KY 40506-0281.