桩基动力参数的灵敏度分析

将桩基简化成离散的多自由度系统,对其纵向振动的动力参数进行了分析,对桩基的振动参数频率、振型、频响函数与频域响应对刚度改变的灵敏度进行了数学推导.可知频率对刚度改变的灵敏度很小,振型对刚度改变的灵敏度也不大,但在节点处有一定的影响,频响函数与频域响应对刚度的变化反应比较明显,并且用一个实例进行了验算,得到的结果与理论推导吻合良好.

The Sensitivity Analysis of Vibration Parameters on Pile

In this paper, the pile is simplified to a discrete MDOF system, and the longitudinal vibration parameters on pile are analyzed. The sensitivity of the vibration parameters due to the change of the stiffness is deducted mathematically. These parameters include the frequency, the model, the frequency response function and the response in frequency field. As a result, the sensitivity of the frequency due to the change of the stiffness is very low and that of the model is also low except on the node; the sensitivities of the frequency response function and the response in the frequency field on the change of the stiffness are strong. An example is worked out and the results indicate that the conclusion is accurate and the two parameters can be used to diagnose the default on the pile.