1. Assistant Professor, Dept. of Civil Engineering, Aswan Univ., 81542, Egypt; formerly, Research Assistant, Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.
2. Professor, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931-1295 (corresponding author).
3. Research Fellow, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, 202 West Boyd St., Room 334, Norman, OK 73019.
4. Professor, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, 202 West Boyd St., Room 334, Norman, OK 73019.