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目前桥梁损伤评估主要采用基于可靠度理论、层析分析法、模糊理论、神经网络以及专家系统等的整体评估,桥梁局部损伤还仅限于定性评估阶段。本文研究改进了基于直接刚度理论的桥梁损伤评估方法,直接研究桥梁动力特性参数的变化值与其损伤程度大小之间的函数关系,从宏观角度定量评估桥梁损伤程度,并与曲率模态振型幅值法评估结果进行比较分析,检验该方法的应用效果。以云南大保高速K442+665特大桥为研究背景,建立空间有限元模型,对该桥的损伤进行模拟分析。研究表明其评估结果具有较好的准确性、有效性和适用性。对进一步研究混凝土桥梁损伤识别理论具有一定的推动作用。
At present, the bridge damage assessment is mainly based on the overall assessment based on reliability theory, tomography, fuzzy theory, neural network and expert system. The local damage of bridge is limited to the qualitative assessment stage. In this paper, we improve the bridge damage assessment method based on the theory of direct stiffness, directly study the relationship between the change of bridge dynamic characteristic parameters and the degree of damage, quantitatively evaluate the bridge damage degree from the macroscopic angle, The method of value evaluation is comparatively analyzed to test the application effect of this method. Taking Daba K442 + 665 bridge in Yunnan Dabao as a research background, the finite element model of space was established and the damage of the bridge was simulated. Research shows that the evaluation results have good accuracy, validity and applicability. It has a certain impetus to further study on the damage identification of concrete bridges.