1. NIIGATA UNIVERSITY, Faculty of Engineering, Depertment of Engineering, Program of Civil Engineering(8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)
2. NIIGATA UNIVERSITY, Faculty of Engineering, Dept. of Civil Engineering and Architecture(8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)
3. UNIVERSITY OF YAMANASHI, Graduate School of Interdisciplinary Research, Department of Civil and Environmental Engineering(4-3-11, Takeda, Kofu-shi, Yamanashi 400-8511, Japan)