1. Ph.D. Student, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011 (corresponding author).
2. Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering and Dept. of Electrical and Computer Engineering, Iowa State Univ., Ames, IA 50011.
3. President, Taylor Devices, 90 Taylor Dr., North Tonawanda, NY 14120.
4. Bruce G. Johnston Professor of Structural Engineering, Lehigh Univ., Bethlehem, PA 18015.