Abstract This paper proposes a method to characterize bridge foundations using live load dynamic strain and acceleration measurements taken from substructure elements during operational loading. These measurements are used to assemble frequency response functions (FRFs) that describe the load-response behavior of the tested foundation element as a function of frequency. This method only requires that a limited number of measurements be performed on the exposed portion of the bridge substructure (piers, columns piles, etc.), and can be performed during daily operational bridge traffic. The direct result of this analysis is an updated boundary condition that be used for modeling of the superstructure in place of the fixed conditions typically used. Furthermore, this method can be used to identify foundation depth and type, verify design parameters, and update finite models of pile and drilled shaft behavior. A case study is presented where dynamic measurements were taken from an in-service drilled shaft.

中文翻译：

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使用动态应变和加速度测量进行地基识别

摘要 本文提出了一种使用活载动态应变和加速度测量值来表征桥梁基础的方法，该测量值在操作加载期间从子结构元件中获取。这些测量用于组合频率响应函数 (FRF)，这些函数将被测基础元件的负载响应行为描述为频率的函数。这种方法只需要对桥梁下部结构（桥墩、柱桩等）的暴露部分进行有限数量的测量，并且可以在日常运营的桥梁交通中进行。该分析的直接结果是更新的边界条件，用于替代通常使用的固定条件对上部结构进行建模。此外，该方法可用于识别基础深度和类型，验证设计参数，并更新桩和钻孔竖井行为的有限模型。介绍了一个案例研究，其中动态测量是从一个在役钻孔轴上进行的。