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Identifying the Foundation Stiffness of a Partially Buried Post from Vibration Measurements

机译：通过振动测量确定部分埋入式桩的基础刚度

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Foundations of posts such as lighting columns can suffer damage or deteriorate over time rendering the post unsafe. Quick, inexpensive and non-intrusive measurement procedures are required to monitor periodically their structural integrity. This paper investigates the behaviour of beam-like structures with a view to identifying a suitable monitoring technique for post foundations. In this initial study a lighting column is modelled as a uniform rigid beam that is constrained by collocated equivalent translational and rotational springs. Expressions are derived for the equivalent spring constants as functions of foundation profile and depth. The static response of the beam is presented as a function of foundation properties. The inverse problem of identifying the foundation stiffnesses from response measurements is discussed. A simple method is proposed based on quasi-static stiffness measurements obtained from impact tests. The method is validated using measurements of a laboratory scale structure.
机译：诸如照明柱之类的柱的基础会随着时间的流逝而损坏或恶化，从而使柱不安全。需要快速，廉价且无干扰的测量程序来定期监视其结构完整性。本文研究了梁状结构的行为，以期确定合适的桩基础监测技术。在此初始研究中，照明柱被建模为均匀的刚性光束，并由并置的等效平移弹簧和旋转弹簧约束。推导等效弹簧常数的表达式，作为基础轮廓和深度的函数。梁的静态响应表示为基础特性的函数。讨论了从响应测量中识别基础刚度的反问题。根据从冲击试验获得的准静态刚度测量值，提出了一种简单的方法。通过实验室规模结构的测量验证了该方法。

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