1. Department of Transportation, Commonwealth of Pennsylvania, Bridgeville, Pennsylvania.
2. Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. M. E. Rinker, Sr. School of Building Construction, University of Florida, 311 Rinker Hall, Gainesville, FL 32611. Phone: 352-273-1155, Fax: 352-392-9606, E-mail: rries@ufl.edu