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现有的基于曲率进行损伤识别的方法一般都需要同时利用结构在损伤前、后的状态信息,但对于大部分实际梁结构,完好状态下的状态信息往往已不可获取。为此,提出基于曲率的新指标——相邻差分曲率差值,对它在单跨梁损伤定位中的应用进行研究。该指标不需要结构在完好状态下的信息,而且对测点处及其附近出现的损伤都可以识别出来。给出新指标的应用方式以及提高鲁棒性的3种方式。算例证明,新指标不仅适用于理想的简支梁,也适用于支座支承的单跨梁。
The existing methods of damage identification based on curvature generally need to use both the state information before and after the damage of the structure at the same time. However, for most of the actual beam structures, the state information in the intact state is often not available. For this reason, a new curvature-based index, the difference between adjacent differential curvatures, is proposed and its application in single-beam damage location is proposed. This indicator does not require the information that the structure is in good condition, and the damage that occurs at and near the measuring point can be identified. Given the application of new indicators and improve the robustness of the 3 ways. The example shows that the new index not only applies to the ideal simply supported beam, but also to the single supported beam.