1. Assistant Professor, Dept. of Civil Engineering, Hashemite Univ., Jordan, P.O. Box 150459, Zarqa 13115, Jordan.
2. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at Austin, 1 University Station C-1752, Austin, TX 78712.
3. Assistant Professor, Dept. of Civil and Coastal Engineering, Univ. of Florida, 365 Weil Hall, Gainesville, FL 32611-6580.