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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。
A method of constructing finite element model of structural damage identification based on genetic algorithm and temperature is introduced. First of all, it is considered that the elastic modulus of materials (such as concrete) is related to temperature, and the relation model between elastic modulus and temperature is established. Then, a finite element model of simply supported beam was established based on Matlab. Genetic algorithm was used to identify damage of non-temperature model and temperature model under four different operating conditions. It was found that no temperature model misidentified temperature change as damage, while temperature Model under different conditions and temperature can well identify the location and extent of injury, can be used as the baseline finite element model. Then the anti-noise ability of the proposed method is studied. It is found that the proposed method is robust against random noise and less-severe Gaussian white noise under different noise levels. Finally, the laboratory model of simply supported beam was established and the vibration test was carried out. A baseline finite element model which can be used for subsequent damage identification was established based on the influence of temperature.