1. Distinguished Professor, Dept. of Civil Engineering, Univ. of Texas at Arlington, P.O. Box 19308, Arlington, TX 76019 (corresponding author).
2. Postdoctoral Fellow, Dept. of Civil Engineering, Univ. of Texas at Arlington, P.O. Box 19308, Arlington, TX 76019.
3. Geotechnical Engineer, PSI, Inc., 310 Regal Row, #500, Dallas, TX 75247.
4. Professor, Dept. of Civil Engineering, Univ. of Texas at Arlington, P.O. Box 19308, Arlington, TX 76019.