1. VDC Engineer, Turner Construction Company, Washington, DC.
2. Rinker Professor, M.E. Rinker, Sr. School of Building Construction, Univ. of Florida, Gainesville, FL 32611-5703 (corresponding author).
3. Assistant Professor, M.E. Rinker, Sr. School of Building Construction, Univ. of Florida, Gainesville, FL 32611-5703.