Some conclusions are drawn : 1 ) effect of inertial force from superstructures on the lateral seismic response of single pile can not be ignored ; 2 ) the lateral seismic response of single pile induced by far - field earthquake are mainly affected by acceleration mass of superstructure > site eigenperiod . it increases with the increment of accele ration and mass of superstructure . as the site characteristic frequency approaches the self - oscillation frequency of the pile , sympathetic vibration occurs and the value of lateral seismic response reaches maximum ; 3 ) as the stiffness ratio of pile to soil increase , the relative displacement of pile to soil increases ; 4 ) the lateral seismic response of fixed - head pile is much smaller than that of free - head pile 将其解析解与具体的的抗震设防烈度和场地特征周期结合起来，计算分析了成层地基中单桩的横向地震响应，得到了以下结论： 1 )上部结构惯性力对桩的横向地震响应的影响不可忽略； 2 )成层地基中的单桩的横向地震响应主要受地震基本加速度、场地特征周期、上部结构质量的影响，随地震基本加速度、上部结构质量的增大而增大；场地特征频率越接近桩基自振频率，桩基地震响应越大，等于自振频率时，由于发生共振现象，桩基响应幅值最大； 3 )桩土刚度比越大，桩土之间的相对位移的幅值越大； 4 )桩顶固接的连接方式，可以有效地降低地震时单桩的横向地震响应。
