1. Engineer, Berger/Abam Engineers Inc., 33301 9th Ave. South, Suite 300, Federal Way, WA 98003; formerly, Instructor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47906 (corresponding author).
2. Professor, School of Civil Engineering, Purdue Univ., West Lafayette, IN 47906; formerly, Assistant Head;
3. Fellow, Prin. Whitlock Dalrymple Poston Associates; 402 W. 7th St., Austin, TX 78701.