Affiliation: | 1Postdoctoral Fellow, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave. Singapore?639798. 2Assistant Professor, Dept. of Civil Engineering, Technical Univ. of Gdansk, Ul. Narutowicza 11/12, 80-952?Gdansk, Poland. 3Professor, Dept. of Civil Engineering, Univ. of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo?113-8656, Japan.
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