1. Assistant Professor, Dept. of Civil Engineering, Clemson Univ., 110 Lowry Hall, Clemson, SC 29634.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Cincinnati, P.O. Box 210071, Cincinnati, OH 45221.