纵向瞬态荷载下基桩的动力响应分析

文章根据桩土系统波动理论,在桩顶施加竖向瞬态激振力情况下,对基桩竖向振动的时域和频域分析进行理论研究。对完整桩时域速度曲线进行拟合处理,分析桩身、桩侧、桩底参数对完整桩时域速度曲线和速度振幅谱曲线的影响,对非完整桩（缩径桩、扩径桩、断桩）也进行类似的分析处理。研究表明：桩土参数的变化对曲线产生了影响,桩侧土剪切波速越大桩底反射衰减的越多,理论波形图和工程桩动测波形图显示出很好的一致性。

Dynamic response of piles subjected to transient longitudinal loading

Based on the wave theory of the pile-soil system, time domain analysts and frequency domain analysts of pile longitudinal vibration, with a vertical transient impact force applied to the pile top, are studied theoretically. The time-domain velocity curve of integrate pile are fitted with the theoretical curve. The characteristics of time-domain velocity and velocity amplitude spectrum curve of integrate pile and non-intact piles (expanding, reducing, segregation) are analyzed when pile-soil parameters are changed. It shows that the changes have influence on curves and results share some rules.