1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Hawaii, 2540 Dole St., Holmes Hall 383, Honolulu, HI 96822.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Hawaii, 2540 Dole St., Holmes Hall 383, Honolulu, HI 96822 (corresponding author). E-mail: