1. KOBE CITY COLLEGE OF TECHNOLOGY, Civil Engineering Department(8-3, Gakuen Higashi-machi, Nishi-ku, Kobe-shi, Hyogo 651-2194, Japan)
2. UNIVERSITY OF HAWAII AT MANOA, Department of Civil and Environmental Engineering(2540, Dole Street, Holmes 383, Honolulu, Hawaii 96822, USA)