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