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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Interpretation of the velocity measured in buildings by seismic interferometry based on Timoshenko beam theory under weak and moderate motion
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Interpretation of the velocity measured in buildings by seismic interferometry based on Timoshenko beam theory under weak and moderate motion

机译：基于Timoshenko梁理论的地震干涉法在弱和中速运动中测得的建筑物速度的解释。

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摘要

Application of seismic interferometry in buildings gained interest in the recent years for structural health monitoring. It allows us to derive the shear wave velocity for an equivalent homogeneous medium representing the structure. Previous authors suggested using a shear beam model to compute the fundamental frequency of the structure out of this velocity. This model is however not adapted to a large part of existing buildings having different behaviors. In this paper, we propose a correction factor from shear beam and based on the Timoshenko beam to link the fundamental frequencies with the observed pulse velocity and the relative effects of shear and bending. This factor provides corrections up to 60% in frequency with respect to the shear beam model. The proposed correction factor shows that the higher velocities observed in the literature for shear wall buildings compared to frame buildings is compensated by their bending flexibility, resulting in resonance frequencies scaling similarly with building height. This model is applied to an 18-story reinforced concrete shear wall building (Ophite tower). The observed pulse velocity obtained by seismic interferometry in this building was about 500 m/s correlated to the resonance frequency by the correction factor. We show that variations of velocity in this-structure and the well-studied Factor building (California), related to non-linear behavior at low strains (down to 10(-5)), can be retrieved with seismic interferometry, demonstrating that this method is sensitive enough for structural health monitoring.
机译：近年来，地震干涉法在建筑物中的应用引起了人们对结构健康监测的兴趣。它使我们能够导出代表结构的等效均质介质的剪切波速度。以前的作者建议使用剪切梁模型从该速度计算结构的基本频率。但是，该模型不适用于具有不同行为的大部分现有建筑物。在本文中，我们提出了一个基于剪切梁的校正因子，并基于季莫申科束将基频与观察到的脉冲速度以及剪切和弯曲的相对影响联系起来。相对于剪切梁模型，该因子可提供高达60％的频率校正。拟议的校正因子表明，与框架建筑物相比，剪力墙建筑物在文献中观察到的更高的速度通过其弯曲柔韧性得到补偿，从而导致共振频率与建筑物高度类似地缩放。该模型适用于18层钢筋混凝土剪力墙建筑（Ophite塔）。在该建筑物中，通过地震干涉法获得的观测脉冲速度约为500 m / s，与共振频率相关，并具有校正因子。我们表明，这种结构和经过充分研究的因子建筑（加利福尼亚）中的速度变化与低应变（低至10（-5））时的非线性行为有关，可以通过地震干涉法来检索，这表明该方法对于结构健康监测足够灵敏。

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