1. Senior Staff Engineer, CTI & Associates, Inc., 12482 Emerson Dr., Brighton, MI 48116; formerly, Doctoral Student, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284 (corresponding author).
2. Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284.
3. Staff Engineer, Thelen Associates, Inc., Erlanger, KY; formerly, Doctoral Student, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907-1284.