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目前桥梁损伤识别主要采用曲率模态分析、振型曲率变化指标、结构固有频率变化、能量变化等方法理论,其中曲率模态分析法应用广泛,识别效果好。但是对桥梁结构同时存在多处不同程度损伤的识别效果并不理想;非结构损伤因素导致结构刚度变化对其识别结果的干扰性亦值得探讨。本文在基于曲率模态绝对差值理论的基础上,分析多处损伤识别的相互干扰性和非结构损伤因素导致结构刚度变化的干扰性,对该方法进一步优化完善。以云南大保高速某特大桥为依托工程,建立空间有限元模型,对该桥的损伤进行模拟分析。研究表明按模态振型幅值大小来优化损伤识别区段可以有效排除其干扰性,提高识别结果的准确性和可靠性。
At present, the bridge damage identification mainly adopts the methods of curvature modal analysis, mode curvature variation index, structural natural frequency change and energy variation, among which the method of curvature modal analysis is widely used and the recognition effect is good. However, the recognition effect of many different degrees of damage to the bridge structure is not ideal at the same time. The non-structural damage factors that cause the disturbance of the structural stiffness to the recognition result are also worth discussing. Based on the theory of absolute difference in curvature mode, this paper analyzes the mutual interference of multiple damage identification and the disturbance of structural stiffness caused by non-structural damage factors, and further optimizes and improves the method. Taking Yunnan Dabao Expressway super-large bridge as a support project, the space finite element model was established and the damage of the bridge was simulated. The research shows that optimizing the damage identification section according to the amplitude of the mode shapes can effectively eliminate the interference and improve the accuracy and reliability of the identification results.