1. Postdoctoral Res. Assoc., School of Civ. Engrg., Purdue Univ., West Lafayette, IN 47907. E-mail: wirahadi@ecn.purdue.edu
2. Assoc. Prof., School of Civ. Engrg., Purdue Univ., West Lafayette, IN 47907.
3. Pres., Blackhawk-PAS, 220 Briar Creek Road, Greer, SC 29650.