基于动力响应的铁路桥梁橡胶支座病害评估方法研究
发布时间：2018-10-21 16:31
【摘要】：本文结合桥梁支座的损伤研究现状及亟待解决的问题,论述了基于模态参数损伤识别理论的方法及优缺点。在此基础上,提出了一种基于Fourier变换置信准则和模型修正理论的桥梁支座动力识别方法,并确立了响应的计算准则,以铁路T梁和多跨连续箱梁为例,对所提出的方法进行了计算分析,并利用朔黄铁路某桥梁的现场试验验证了该方法的适用性和可靠性。本文的主要工作及结论如下： (1)基于Fourier置信准则的概念,结合模型修正理论,提出了一种桥梁支座损伤动力识别方法,并阐述了该方法的基本理论和计算流程。 (2)通过一个三跨连续梁和五跨连续梁数值计算,验证了所提方法的可行性,通过分析比较得到了该方法频率段和测点的选取原则,为后续计算提供了理论依据。 (3)以实际的铁路双T梁作为算例,验证了频率段和测点的选取原则,并对其支座进行损伤识别,将本文的识别理论从平面结构拓展到空间结构,并对所提理论进行了验证。 (4)对一座实际铁路桥梁的支座刚度进行了识别,将识别出来的刚度参数输入有限元中计算结构动力响应,再与实测结果进行对比。实测结果和数值计算结果吻合良好,从而证明了所提方法的可靠性和适用性。
[Abstract]:In this paper, combined with the present situation of bridge support damage research and the problems to be solved urgently, the method based on modal parameter damage identification theory and its advantages and disadvantages are discussed in this paper. On this basis, a dynamic identification method of bridge support based on Fourier transform confidence criterion and model modification theory is proposed, and the response calculation criterion is established. The examples of railway T-beam and multi-span continuous box girder are given. The proposed method is calculated and analyzed, and the applicability and reliability of the method are verified by the field test of a bridge in Shuohuang railway. The main work and conclusions of this paper are as follows: (1) based on the concept of Fourier confidence criterion and model modification theory, a dynamic damage identification method for bridge supports is proposed. The basic theory and calculation flow of the method are described. (2) the feasibility of the proposed method is verified by numerical calculation of a three-span continuous beam and a five-span continuous beam. Through the analysis and comparison, the selection principle of frequency section and measuring point of this method is obtained, which provides a theoretical basis for further calculation. (3) taking the actual double T beam of railway as an example, the principle of selecting frequency section and measuring point is verified. The damage identification of the bearing is carried out, the recognition theory of this paper is extended from plane structure to spatial structure, and the proposed theory is verified. (4) the stiffness of a real railway bridge is identified. The identified stiffness parameters are input into the finite element method to calculate the dynamic response of the structure, and the results are compared with the measured results. The measured results are in good agreement with the numerical results, which proves the reliability and applicability of the proposed method.
【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】：U443.361
本文编号：2285699
[Abstract]:In this paper, combined with the present situation of bridge support damage research and the problems to be solved urgently, the method based on modal parameter damage identification theory and its advantages and disadvantages are discussed in this paper. On this basis, a dynamic identification method of bridge support based on Fourier transform confidence criterion and model modification theory is proposed, and the response calculation criterion is established. The examples of railway T-beam and multi-span continuous box girder are given. The proposed method is calculated and analyzed, and the applicability and reliability of the method are verified by the field test of a bridge in Shuohuang railway. The main work and conclusions of this paper are as follows: (1) based on the concept of Fourier confidence criterion and model modification theory, a dynamic damage identification method for bridge supports is proposed. The basic theory and calculation flow of the method are described. (2) the feasibility of the proposed method is verified by numerical calculation of a three-span continuous beam and a five-span continuous beam. Through the analysis and comparison, the selection principle of frequency section and measuring point of this method is obtained, which provides a theoretical basis for further calculation. (3) taking the actual double T beam of railway as an example, the principle of selecting frequency section and measuring point is verified. The damage identification of the bearing is carried out, the recognition theory of this paper is extended from plane structure to spatial structure, and the proposed theory is verified. (4) the stiffness of a real railway bridge is identified. The identified stiffness parameters are input into the finite element method to calculate the dynamic response of the structure, and the results are compared with the measured results. The measured results are in good agreement with the numerical results, which proves the reliability and applicability of the proposed method.
【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】：U443.361
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