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首页> 外文期刊>Bulletin of earthquake engineering >System identification and model calibration of multi-story buildings through estimation of vibration time histories at non-instrumented floors
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System identification and model calibration of multi-story buildings through estimation of vibration time histories at non-instrumented floors

机译：通过估计非仪表层的振动时间历史来对多层建筑物进行系统识别和模型校准

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摘要

A simple approach is introduced to identify and calibrate analytical models of multi-story buildings from their vibration records. The method is based on the Transfer Matrix formulation of the response, and requires that vibration time histories are known at every floor of the building. Since this is typically not the case, first a methodology is developed to estimate vibration time histories at non-instrumented floors of the building from those recorded at the instrumented floors, based on the assumption that the mode shapes of a multi-story building can be approximated as a linear combination of the mode shapes of a shear beam and a bending beam. Once the vibration time histories are known at every floor, it is shown by using the Transfer Matrix formulation that the top-to-bottom spectral ratio of the records at a particular story is dependent only on the properties of this story and the stories above. In other words, any change in the characteristics of the stories below does not affect the spectral ratio for this story. Therefore, starting from the top story, we can identify frequency of each story (i.e., story stiffness/story mass), or directly story stiffness if the story mass is known. In addition to system identification, the approach also provides a simple tool to calibrate analytical models of multi-story buildings from their vibration records.
机译：引入了一种简单的方法来从多层建筑物的振动记录中识别和校准多层建筑物的分析模型。该方法基于响应的传递矩阵公式，要求在建筑物的每个楼层都知道振动时间历史。由于通常情况并非如此，因此首先开发了一种方法，可根据多层建筑物的振型可以假设的方法，根据在仪器楼层记录的振动时间历史来估算建筑物非仪器楼层的振动时间历史。近似为剪切梁和弯曲梁的振型的线性组合。一旦知道了每个楼层的振动时间历史记录，便可以使用Transfer Matrix公式表明，特定故事记录的上下频谱比仅取决于该故事和以上故事的属性。换句话说，以下故事的特征的任何变化都不会影响该故事的频谱比率。因此，我们可以从头层故事开始，确定每个故事的发生频率（即故事的刚度/故事质量），如果知道故事的质量，则可以直接确定故事的僵硬度。除了系统识别之外，该方法还提供了一种简单的工具，可以根据多层建筑物的振动记录来校准多层建筑物的分析模型。

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