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Damage Assessment in Concrete Beams Using Non-Linear Analysis of Vibration Measurements

机译：基于非线性振动测量的混凝土梁损伤评估

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摘要

Many researchers have proposed methods of assessing structural damage by analysis of vibration measurements. Most approaches involve comparing vibration signals measured on the structure before and after damage, with both signals analysed using linear methods. For concrete structures, there is evidence that the actual behaviour is non-linear even at very low amplitudes of excitation. A possible alternative method is therefore to assess damage by estimating the degree of non-linearity present within a given response measurement. In this paper, tests are reported on simply supported, reinforced concrete beams subjected to increasing levels of flexural cracking at midspan. At each damage level, the degree of non-linearity is assessed by examining the variation of measured natural frequency with vibration amplitude, as determined by time-frequency analysis of transient vibrations. The results showed a sharp increase in non-linearity due to initial cracking, but then only quite small changes as the cracks grew. At very high damage levels there appeared to be a reduction in the degree of non-linearity, indicating that the non-linear mechanism present in the system was breaking down. On the basis of these findings, it is concluded that measures of non-linearity may be useful in detecting the initiation of damage, but are unlikely to be helpful in differentiating between intermediate damage levels.
机译：许多研究人员提出了通过振动测量分析来评估结构损伤的方法。大多数方法都涉及比较损坏前后在结构上测得的振动信号，以及使用线性方法分析的两个信号。对于混凝土结构，有证据表明，即使在非常低的激发振幅下，实际行为也是非线性的。因此，一种可能的替代方法是通过估计给定响应测量中存在的非线性程度来评估损坏。在本文中，报告了在中跨上受挠性裂缝不断增加的情况下，对简单支撑的钢筋混凝土梁进行的测试。在每个损伤级别，通过检查测得的固有频率随振动幅度的变化来评估非线性程度，该变化由瞬态振动的时频分析确定。结果表明，由于初始裂纹，非线性急剧增加，但是随着裂纹的增长，其变化很小。在非常高的损坏水平下，非线性程度似乎有所降低，这表明系统中存在的非线性机制正在崩溃。根据这些发现，可以得出结论，非线性度的度量可能对检测损坏的开始很有用，但不太可能有助于区分中间损坏程度。

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