1. Associate Professor, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015 (corresponding author).
2. Research Civil Engineer, U.S. Army Engineer Research & Development Center, Vicksburg, MS 39180-6199; formerly, Air Force Research Laboratory Support Contractor, Applied Research Associates, Inc., Tyndall AFB, FL.
3. Graduate Student Researcher, Lehigh Univ., Bethlehem, PA 18015.
4. Research Civil Engineer, Air Force Research Laboratory, Tyndall AFB, Panama City FL, 32403.