Seismic design of pile-supported wharves against the level-one earthquake ground motion is carried out by pseudo-static method using the seismic coefficient calculated with the natural period of piled wharf and the acceleration response spectrum at virtual fixed point of the piles. Meanwhile dynamic analysis is also employed, taking into consideration for the dynamic interaction of piles and ground. These methods focusing the response behavior of pile-supported wharves may sometimes yield different results depending on conditions.
　Response behaviors of pile-supported wharves with the pseudo-static and dynamic analyses were compared in this report. N-PIER and FLIP were employed as frame analysis of pseudo-static method and 2-dimensional dynamic finite element analysis, respectively. The analyses were carried out on a typical piled wharf against level-1 earthquake motion under the condition of non-liquefaction and small displacement of landward earth-retaining portion. As the result, it is clarified that discrepancy in of subgrade reaction and the damping factor in the pseudo-static and dynamic analyses causes the difference in the response behaviors of the piled wharf.