考虑温度影响的结构损伤识别基准有限元模型

发布时间：2018-03-04 19:07

本文选题：基准有限元模型　切入点：温度影响　出处：《中外公路》2017年05期 　论文类型：期刊论文

【摘要】：介绍了一种基于遗传算法、考虑温度影响的结构损伤识别基准有限元模型建立方法。首先,认为材料(如混凝土)的弹性模量与温度相关,确立了弹性模量和温度的关系模型。然后,基于Matlab建立了一个简支梁的有限元模型,并采用遗传算法进行了4种工况下无温度模型和温度模型的损伤识别,发现无温度模型将温度变化误识别为损伤,而温度模型在不同工况和温度下均能很好地识别出损伤位置和程度,可作为基准有限元模型。随后研究了该文方法的抗噪能力,发现在不同噪声水平下,对于随机噪声和不太高的高斯白噪声具有较强的鲁棒性。最后建立了简支梁试验室模型,进行了振动测试,建立了考虑温度影响的、可用于后续损伤识别的基准有限元模型。
[Abstract]:This paper introduces a finite element method for structural damage identification based on genetic algorithm and considering the influence of temperature. Firstly, it is considered that the elastic modulus of materials (such as concrete) is related to temperature. The relationship between elastic modulus and temperature is established. Then, based on Matlab, a finite element model of simply supported beam is established, and the damage identification of temperature free model and temperature model under four working conditions is carried out by genetic algorithm. It is found that the temperature change is mistakenly identified as damage by the temperature-free model, and the temperature model can identify the location and extent of the damage well under different working conditions and temperatures, which can be used as the benchmark finite element model. Then, the anti-noise ability of the proposed method is studied. It is found that under different noise levels, there is strong robustness to random noise and not too high Gao Si white noise. Finally, a simple beam laboratory model is established, vibration test is carried out, and temperature effect is taken into account. The benchmark finite element model can be used for subsequent damage identification.
【作者单位】：武汉工程大学资源与土木工程学院;
【基金】：国家留学基金委资助项目(编号:201508420074) 国家自然科学基金资助项目(编号:51378404) 湖北省自然科学基金资助项目(编号:2014CFB773)
【分类号】：U446

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