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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Damage Reconstruction Of 3d Frames Using Genetic Algorithms With Levenberg- Marquardt Local Search
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Damage Reconstruction Of 3d Frames Using Genetic Algorithms With Levenberg- Marquardt Local Search

机译：Levenberg-Marquardt局部搜索的遗传算法对3d框架的损伤重建

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摘要

A damage detection method based on harmonic structural vibrations has been applied to reconstruct typical damage patterns of reinforced concrete beams and frames vibrating in three dimensions. It has been shown that comparison of harmonic vibrations of damaged and intact structures makes it possible to formulate optimization criterion which can be solved effectively for large number of unknowns. The application of combined genetic algorithms and Levenberg-Marquardt local search enabled to reconstruct vectors of distinct stiffness distributions containing up to 32 elements with stiffness loss as low as 5% and with accuracy of 1%. To test the algorithm in more realistic environment of practical data acquisition, measuring noise with various levels has been added to the analyzed signal. Such a method of damage detection can be quite effective during post-earthquake assessment of civil engineering structures or if one wants to control the stiffness loss of a reinforced concrete structure after it was accidentally overloaded.
机译：基于谐波结构振动的损伤检测方法已被应用于重建三维振动的钢筋混凝土梁和框架的典型损伤模式。结果表明，通过比较受损结构和完好结构的谐波振动，可以制定出优化准则，该准则可以有效解决大量未知数。结合遗传算法和Levenberg-Marquardt局部搜索的应用，可以重建包含多达32个元素的不同刚度分布的矢量，这些元素的刚度损失低至5％，准确度为1％。为了在更实际的实际数据采集环境中测试该算法，已将各种级别的噪声测量添加到了分析信号中。这种损伤检测方法在土木工程结构的地震后评估中，或者如果要控制钢筋混凝土结构意外过载后的刚度损失时，可能非常有效。

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