1. Professor and Head, Division of Construction Engineering and Management; Professor of Civil Engineering, Purdue Univ., HAMP 1223, 550 Stadium Mall Dr., West Lafayette, IN 47907-2051.
2. Visiting Scholar, Division of Construction Engineering and Management, Purdue Univ., HAMP 1223, 550 Stadium Mall Dr., West Lafayette, IN 47907-2051 (corresponding author).