基桩质量定量分析的频响函数法

A method for pile quantitative analysis with frequency response function

实测桩顶响应信号是振源与系统频响函数的时域卷积 .本文利用时谱技术 ,从桩顶反射信号的功率谱中分解得到频响函数的模函数 |H(f) |,导出了 |H(f) |函数与反射系数r的关系 ,提出了利用 |H(f) |函数定量识别基桩质量的方法 .为了证明本文方法的有效性 ,给出了 3根桩的识别实例 .

The tested signal on pile head is the convolution of the vibration resource and frequency response function of itself in domain of time. Using cepstrum technique, the function |H(f)| is extracted from the power of velocity on a pile head, the relation between the function |H(f)| is concluded and a method for pile quantitative analysis is proposed in this article. Three practical examples are given to show the effectiveness of the proposed method.