1. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at El Paso, 500 W. University Ave., El Paso, TX 79902 (corresponding author).
2. Senior Research Engineer, Applied Research Associates, Inc., 104 Research Rd., Bldg. 9742, Tyndall AFB, FL 32403.
3. Senior Researcher, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180.