1. Dept. of Civil Engineering, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
2. School of Architecture and Building, Deakin Univ., 1 Gheringhap Street, Geelong, VIC 3217, Australia.
3. Toyota Techno Service Corporation, Inomae 1-21, Hanamoto-cho, Toyota 470-0334, Japan.