1. Institute Professor, Dept. of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 110 8th St., JEC 4049, Troy, NY 12180 (corresponding author).
2. Iovino Chair Professor, Dept. of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, 110 8th St., JEC 4049, Troy, NY 12180.
3. Jennie C. and Milton T. Graves Chair, Dept. of Civil Engineering, Univ. of Texas at Austin, Austin, TX 78712.
4. Associate Professor, Dept. of Civil and Environmental Engineering, California Polytechnic State Univ., San Luis Obispo, CA 93407.
5. Geotechnical Engineer, Haley & Aldrich, Inc., 3 Bedford Farms Dr., Bedford, NH 03110.
6. Project Engineering Associate, Paul C. Rizzo Associates, Inc., 500 Penn Center Blvd., Penn Center East, Bldg. 5, Ste. 100, Pittsburgh, PA 15235.