1. Professor, Dept. of Civil and Environmental Engineering, California State Univ., Fullerton, 800 N. State College Blvd., E-419, Fullerton, CA 92831.
2. Professor, Dept. of Civil, Environmental and Geodetic Engineering, Ohio State Univ., 491C Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, California State Univ., Fullerton, 800 N. State College Blvd., E-318, Fullerton, CA 92831.