1. Assistant Professor, Dept. of Civil Engineering, Hashemite Univ., Jordan, P.O. Box 150459 Zarqa 13115 Jordan. E-mail: mashaleh@hu.edu.jo
2. Assistant Professor, Dept. of Civil and Coastal Engineering, Univ. of Florida, 365 Weil Hall, P.O. Box 116580, Gainesville, FL 32611-6580. E-mail: minch@ufl.edu
3. Assistant Professor, Dept. of Civil Engineering, Univ. of Texas at Austin, 1 University Station C-1752, Austin, TX 78712. E-mail: wjob@mail.utexas.edu