1. Assistant Professor, Dept. of Civil and Environmental Engineering, Howard Univ., 2300 Sixth St. NW, Washington, DC 20059; formerly, Ph.D. Candidate, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019.
2. Assistant Professor, Dept. of Civil Engineering, Univ. of Birjand, 97175 Birjand, Iran.
3. Faculty Member, Dept. of Civil Engineering, Behbahan Khatam Alanbia Univ. of Technology, 63616 Behbahan, Iran.
4. Associate Professor, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK 73019 (corresponding author).