1. Assistant Professor, Dept. of Civil and Environmental Engineering, California State Univ., Fullerton, 800 N. State College Blvd., E-318, Fullerton, CA 92831.
2. Professor, Dept. of Civil and Environmental Engineering, California State Univ., Fullerton, 800 N. State College Blvd., E-419, Fullerton, CA 92831.
3. Graduate Student, Dept. of Civil and Environmental Engineering, California State Univ., Fullerton, 800 N. State College Blvd., Fullerton, CA 92831.