1. Assistant Professor, Environmental and Civil Engineering Dept., Southern Methodist Univ., P.O. Box 750340, Dallas, TX 75275 (corresponding author). E-mail: uelshamy@engr.smu.edu
2. Formerly, Graduate Student, Civil and Environmental Engineering Dept., Tulane Univ., 6823 St. Charles Ave., New Orleans, LA 70118. E-mail: faydin@tulane.edu