基于频响函数模式置信准则的桥梁损伤动力识别方法研究

发布时间：2018-06-17 08:12

本文选题：频响函数 + 模式置信准则　；参考：《北京交通大学》2014年硕士论文

【摘要】：本文阐述了基于模态参数模型修正理论损伤识别方法的优点和局限性,论述了频响函数在实际测试中的优点,提出了一种基于频响函数模式置信准则的桥梁损伤动力识别方法,通过数值分析提出了该方法的计算准则,并利用数值模型验证该方法的可行性。在此基础上研究了损伤测点优化布置方案,分别通过模型试验和现场试验验证了该方法识别损伤的可靠性。本文的主要工作及结论如下： (1)提出了基于频响函数模式置信准则的桥梁损伤动力识别方法。在模型修正基础上,将相邻测点频响函数模式置信准则作为新的目标函数。同时阐述了该方法的基本理论和计算流程。 (2)通过数值分析,确定将传递函数中第一阶峰值和第二阶峰值间的平直频率段段选取为分析频率段。 (3)通过数值算例,验证了基于频响函数模式置信准则损伤识别方法的可行性和频率段选取原则的正确性。 (4)在频响函数模式置信准则损伤识别方法基础上,研究了分布式和分站式两种损伤识别测点优化布置方案。 (5)利用分步式测点优化布置,对模型梁进行冲击振动实验,验证了频响函数模式置信准则损伤识别方法的可行性。 (6)利用分站式测点优化布置,对钢筋混凝土简支梁进行现场损伤冲击振动试验,验证了频响函数模式置信准则损伤识别方法的实用性。
[Abstract]:In this paper, the advantages and limitations of damage identification method based on modal parameter model correction theory are described. The advantages of frequency response function (FRF) in practical testing are discussed, and a bridge damage dynamic identification method based on FRF mode confidence criterion is proposed. The computational criteria of the method are presented by numerical analysis, and the feasibility of the method is verified by numerical model. On this basis, the optimal layout of damage detection points is studied, and the reliability of the method is verified by model test and field test. The main work and conclusions of this paper are as follows: (1) A bridge damage dynamic identification method based on the confidence criterion of frequency response function (FRF) is proposed. On the basis of model modification, the confidence criterion of frequency response function (FRF) of adjacent measurement points is taken as a new objective function. At the same time, the basic theory and calculation flow of the method are described. It is determined that the straight frequency segment between the first and second order peaks in the transfer function is selected as the analytical frequency segment. The feasibility of the damage identification method based on the frequency response function pattern confidence criterion and the correctness of the principle of frequency band selection are verified. (4) on the basis of the frequency response function pattern confidence criterion damage identification method, In this paper, two kinds of optimal layout schemes of damage detection points of distributed and sub-station types are studied. The impact vibration experiments of the model beams are carried out by using the split step method to optimize the layout of measuring points. The feasibility of the damage identification method based on the confidence criterion of frequency response function (FRF) is verified. The practicability of the damage detection method based on the confidence criterion of frequency response function (FRF) is verified.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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