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本文将承受强烈垂直激振作用的单桩作为非线性单自由度体系考虑,采用等效线性化方法,列出质量-阻尼-弹簧模式的非线性振动微分方程。其中包含有取决于振幅的等效线性刚度和阻尼。利用动力反应曲线的几何性质反演计算各振动参数,并且以砂坑中大尺寸模型桩的动力试验量测结果进行验证。这种实用分析方法很简便,对于桩-土系统振动参数的研究是很有效的。
In this paper, the single pile subjected to strong vertical excitation is considered as a nonlinear single degree of freedom system. The equivalent linearization method is used to list the nonlinear vibration differential equation of mass-damping-spring mode. It contains the equivalent linear stiffness and damping depending on the amplitude. The vibration parameters were inversely calculated using the geometric properties of the dynamic response curve, and the dynamic test results of large-size model piles in sand pits were verified. This practical analysis method is very simple and effective for the study of vibration parameters of pile-soil systems.