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本文建立了完整桩和各种缺陷桩的机械导纳数学模型.并用计算机分析了它们的导纳曲线基本特征及有关参数对导纳曲线共振峰频率的影响.在现有阻抗法的基础上,提出了用计算机拟合实测导纳曲线的方法以获得准确反映桩身缺陷的位置、范围和性质的有关参数.用瞬态激振的方法,借助于SD-375动态分析仪,对各种缺陷的钢筋混凝土模型桩进行了试验,结果表明,本文提出的方法是可行的.
This paper establishes the mathematical model of mechanical admittance for complete piles and various defective piles. It also analyzes the basic characteristics of their admittance curves and the influence of relevant parameters on the resonant formant frequency of the admittance curve. Based on the existing impedance method, A method of fitting the measured admittance curve with a computer was proposed to obtain relevant parameters that accurately reflect the position, range, and properties of the pile defect. With the method of transient excitation, the SD-375 dynamic analyzer was used to analyze various defects. The reinforced concrete model piles were tested and the results show that the proposed method is feasible.