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Damage detection via modal analysis of masonry structures using shaking table tests

机译：使用摇柱测试通过模拟分析损伤检测

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摘要

In the last two decades, the use of modal parameters to detect and localize structural damage has gained increasing interest in the scientific community. The work reported in the literature mainly deals with the change of natural frequencies due to changes in structural properties given by damage. This approach relies on the accurate modal parameters estimation, which is still a very difficult task especially when complex structural systems are of interest. Furthermore, damage detection and localization can be highly inaccurate if natural frequencies are used only, regardless of the associated mode shapes. This paper investigates the effectiveness of vibration-based methods for dynamic identification and damage detection on masonry structures using experimental tests and operational modal analysis. In particular, ambient vibration tests are first used to obtain modal parameters of two different building models made up of unreinforced and confined masonry, respectively. A shaking table is then used to give a sequence of increasing seismic loads to each of the two masonry models. Damage-induced variations of the modal parameters, i.e., natural frequencies and associated mode shapes, are estimated after each seismic level using the structural vibrations caused by a low-level white noise base excitation. The obtained results give useful information on the effectiveness of vibration-based methods to detect and localize different damage patterns on masonry structures using changes in the modal parameters. Furthermore, it was possible to assess the different seismic performance of the confined masonry structural system compared to the unreinforced masonry.
机译：在过去的二十年中，使用模态参数来检测和定位结构损伤已经增加了对科学界的兴趣。文献中报告的工作主要涉及由于损坏所造成的结构性变化导致的自然频率的变化。这种方法依赖于准确的模态参数估计，仍然是一个非常艰巨的任务，尤其是当复杂的结构系统非常感兴趣时。此外，如果仅使用自然频率，则可以高度不准确地，损坏检测和定位，无论相关模式形状如何。本文研究了使用实验试验和操作模态分析对砌筑结构动态识别和损伤检测的振动识别和损伤检测的有效性。特别地，首先使用环境振动测试来获得由不合因和狭窄的砌体构成的两个不同建筑模型的模态参数。然后使用摇动台来给出两个砌体模型中的每一个增加地震载荷的序列。在使用由低电平白噪声励磁引起的结构振动之后，估计模态参数，即自然频率和相关模式形状的损伤诱导变化。所获得的结果提供了有关基于振动的方法的有效性的有用信息，使用模态参数的变化来检测和定位砌体结构上的不同损伤模式的不同损伤模式。此外，与未原始的砌体相比，可以评估狭窄的砌体结构系统的不同地震性能。

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