This paper selects a structural segment of a pile wharf as the research object and builds a spatial finite element model and the response of such a structure under horizontal earthquake effect is studied with the vibration mode decomposition re-. Sponse spectrum. The change of internal force in piled foundations under the effect of different direction of earthquake is studied. The computed results show that the bending moment of fork pile top under the longitudinal earthquake effect is bigger obviously than that under the lateral earthquake effect. When the arrangement of pile foundation on the vertical axis is asymmetry, the pile torque under the longitudinal earthquake effect is bigger. Under the lateral earthquake effect, the axial force of the later fork pile is bigger. The research results in the paper can provide references for the aseismatic design of pile wharfs.%以高桩码头一个结构段为研究对象,建立空间有限元模型,采用振型分解反应谱法探讨了此类结构在水平地震作用下的响应,对不同地震方向作用下码头桩基内力变化进行分析.计算结果表明:结构在纵向水平地震作用下叉桩桩顶弯矩明显大于横向水平地震作用下的桩顶弯矩；当码头桩基布置对纵轴不对称时,纵向水平地震作用下桩的扭矩较大:横向地震作用下,后叉桩的轴力较大.研究结果可为高桩码头的抗震设计提供参考.
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