Japanese design standard for port and harbor facilities was revised in 2007, modifying the method used to calculate the horizontal seismic coefficient,
kh. The comprehensive change of the method indicates that the quay walls designed by the previous standard could be lack of earthquake resistance in terms of the current standard. In the present study, the coefficients,
kh, calculated by the two standards were compared for the existing quay walls constructed in Kanto area, Japan. In addition, the factors that affected the relationship of two types of coefficients,
kh, were identified by means of multiple regression analyses. Only 16 % of the current standard of
kh exceeded the previous standard of
kh. According to the multiple regression analyses, the ratio of two types of coefficients,
kh, tended to increase in the quay walls which were located in a specific port and had the large wall height and the small importance factor.
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