1. Postdoctoral Research Associate, Rensselaer Polytechnic Institute, 110 8th St., Troy, NY 12180.
2. Associate Professor, Northwestern Univ., 1245 Sheridan Rd., Evanston, IL 60208 (corresponding author).
3. Chief Scientist, Engineering and Software System Solutions, Inc. (ES3), San Diego, CA 92101.
4. Research Structural Engineer, U.S. Army Engineer Research and Development Center (ERDC), Vicksburg, MS 39180.