【摘要】 通过引述振源激振的动力模型和相应的控制方程,用四阶Runge-Kutta方法解得该方程的数值解。并结合桩基检测中常用的振源及工程桩的参数,绘出了激振力的图形。并将该图形与两种常用的激振力脉冲模拟函数对应的图形进行对比,以评价各模拟函数的精确度和适用性。通过改变单一参数的方法模拟了振源的质量、冲击速度、材质的软硬程度对激励力的力幅和脉冲宽度的影响。最后将现场对比试验结果与本文方法分析的结果进行对比分析,二者结论一致。说明本文的方法可以很好的模拟振源的激振力。同时也对该模型的优缺点加以分析。更多还原

【Abstract】 A dynamic model of vibration-sourced prompting and its corresponding governing equation are quoted.By solving the equations by four-step Runge-Kutta.With the general parameters of the vibration sources and pile,a figure of the pulse of exciting force is obtained.Then the figure is compared with another two different figures corresponding to two functions of pulse simulation .As a result,the accuracy and applicability of the functions is estimated.The effect of the mass of the vibration source,impact speed and the softness or hardness degree of the material on the strength and width of exciting force is simulated by changing a single parameter.Finally,it is demonstrated that the results from this solution are in accordance with the field test.Meanwhile the advantages and disadvantages of the model are also analyzed.更多还原