1. Director, Dept. of Civil and Coastal Engineering, Bridge Software Institute, Univ. of Florida, P.O. Box 116580, Gainesville, FL 32611.
2. Associate Professor, Dept. of Civil and Coastal Engineering, Univ. of Florida, P.O. Box 116580, Gainesville, FL 32611 (corresponding author).
3. Chief, Engineering Mechanics and Explosive Effects Group, Air Force Research Laboratory, 104 Research Rd., Bldg. 9742, Tyndall AFB, FL 32403.
4. Principal Staff Engineer, Air Force Research Laboratory, 104 Research Rd., Bldg. 9742, Tyndall AFB, FL 32403.