Taking the effect of finite soil layers below pile end into account,the longitudinal dynamic response of pile undergoing dynamic loading in layered soil was theoretically investigated.Firstly,finite soil layers below ...Taking the effect of finite soil layers below pile end into account,the longitudinal dynamic response of pile undergoing dynamic loading in layered soil was theoretically investigated.Firstly,finite soil layers below pile end are modeled as virtual soil pile whose cross-section area is the same as that of the pile and the soil layers surrounding the pile are described by the plane strain model.Then,by virtue of Laplace transform and impedance function transfer method,the analytical solution of longitudinal dynamic response at the pile head in frequency domain is yielded.Also,the semi-analytical solution in time domain undergoing half-cycle sine pulse at the pile head is obtained by means of inverse Laplace transform.Based on these solutions,a parametric study is conducted to analyze emphatically the effects of parameters of soil below pile end on velocity admittance and reflected wave signals at the pile head.Additionally,a comparison with other models with different supporting conditions from soil below pile end is performed to verify the model presented.展开更多
为了快捷、准确地获取桩基横向动力学模型的参数,通过建立桩基激振理论模型,并求解得到桩基测点加速度响应的理论结果;利用激振方法,用加速度传感器获取桩基测点加速度响应的试验结果;通过计算桩基测点加速度响应理论结果和试验结果的...为了快捷、准确地获取桩基横向动力学模型的参数,通过建立桩基激振理论模型,并求解得到桩基测点加速度响应的理论结果;利用激振方法,用加速度传感器获取桩基测点加速度响应的试验结果;通过计算桩基测点加速度响应理论结果和试验结果的动态时间弯曲(dynamic time warping,DTW)距离的均方根,将问题转换为目标函数的寻优问题;利用遗传算法进行桩基模型参数的寻优;为解决参数识别过程中复杂数据的运算问题,实现工程实用化,通过COM组件实现MATLAB与LabVIEW混合编程,开发出一套桩基模型参数智能识别系统软件。最后,通过算例说明本研究方法是有效的,且具有工程实践意义。展开更多
基金Project(50879077) supported by the National Natural Science Foundation of China
文摘Taking the effect of finite soil layers below pile end into account,the longitudinal dynamic response of pile undergoing dynamic loading in layered soil was theoretically investigated.Firstly,finite soil layers below pile end are modeled as virtual soil pile whose cross-section area is the same as that of the pile and the soil layers surrounding the pile are described by the plane strain model.Then,by virtue of Laplace transform and impedance function transfer method,the analytical solution of longitudinal dynamic response at the pile head in frequency domain is yielded.Also,the semi-analytical solution in time domain undergoing half-cycle sine pulse at the pile head is obtained by means of inverse Laplace transform.Based on these solutions,a parametric study is conducted to analyze emphatically the effects of parameters of soil below pile end on velocity admittance and reflected wave signals at the pile head.Additionally,a comparison with other models with different supporting conditions from soil below pile end is performed to verify the model presented.
文摘为了快捷、准确地获取桩基横向动力学模型的参数,通过建立桩基激振理论模型,并求解得到桩基测点加速度响应的理论结果;利用激振方法,用加速度传感器获取桩基测点加速度响应的试验结果;通过计算桩基测点加速度响应理论结果和试验结果的动态时间弯曲(dynamic time warping,DTW)距离的均方根,将问题转换为目标函数的寻优问题;利用遗传算法进行桩基模型参数的寻优;为解决参数识别过程中复杂数据的运算问题,实现工程实用化,通过COM组件实现MATLAB与LabVIEW混合编程,开发出一套桩基模型参数智能识别系统软件。最后,通过算例说明本研究方法是有效的,且具有工程实践意义。
