考虑质量变化的空间拱结构小损伤识别方法研究

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Abstract In order to improve the accuracy of damage identification for spatial arch structures, a dynamic identification method for small damage of spatial arch structures was proposed. In the process of structural damage identification, the accuracy of structural damage identification was improved by considering the factors of quality change of damage zone. In the damage model of spatial arch structure, the change of mass factor of frequency and mode shape was used to represent the change of mass in the damage zone. Wittrick-Williams algorithm was used to calculate the damage parameters, and the damage location and degree of the structure were determined according to the calculation results. In order to accurately identify structural damage with the least measured modal and structural vibration characteristics data, an optimization calculation program based on genetic algorithm was established to optimize the damage parameters. In this optimization program, the initial random chromosome group was used to represent the damage distribution along the spatial arch. The method was validated by damage identification cases of single damage, multiple damage regions and space arch under different boundary conditions, and the uniqueness of damage location for symmetrical structures was analyzed and solved. The results show that the proposed method has a good identification effect on the damage of space arch structures, and the established damage identification program has a high identification accuracy.

Key words： Spatial Arch Structures Small Damage Genetic Algorithms Optimal Computing Program

Received: 29 December 2018 Published: 15 August 2020

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	Articles by authors
	ZHANG Xiaozhong
	SUN Guomin

Cite this article:

ZHANG Xiaozhong,SUN Guomin. A small-damage identification method for spatial arch structures considering mass variations[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(16): 81-88.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I16/81

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