1. Doctoral Candidate, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, 202 West Boyd St., 334, Carson Engineering Center, Norman, OK 73019.
2. Assistant Professor, School of Civil and Environmental Engineering, Temple Univ., 1947 N. 12th St., Philadelphia, PA 19122 (corresponding author).
3. David Ross Boyd Professor and Aaron Alexander Professor, Associate Dean for Research, College of Engineering, Univ. of Oklahoma, 202 West Boyd St., 107, Carson Engineering Center, Norman, OK 73019.