基于动力响应灵敏度分析的铁路桥墩状态评估方法
发布时间：2018-07-26 14:03
【摘要】：目前,结构动力损伤识别理论多集中在桥梁上部结构上,针对下部结构桥墩和基础的研究较少。本文在既有研究的基础上,提出了一种利用动力响应灵敏度分析的铁路桥墩墩身和基础状态评估方法。本文的主要工作内容和成果如下： (1)对各种结构损伤识别方法的研究现状进行了简单介绍,比较了各种方法的优缺点,总结了现有损伤识别方法研究难点和发展方向。 (2)详细论述了基于灵敏度分析的模型修正方法,阐述了基于灵敏度分析的损伤识别理论和灵敏度方程的求解方法。 (3)建立了考虑梁质量和基础约束的桥墩有限元模型,对桥墩墩身刚度下降和提高两种工况进行了分析。结果表明,基于动力响应灵敏度分析的损伤评估方法对桥墩状态变化的位置及程度均能够进行准确的识别。 (4)选取了不同的激励位置和响应点位置,对结构进行了损伤识别,分析总结了激励位置和响应点位置对识别结果的影响,给出了较为合理的测点布置建议。 (5)用所提方法对桥梁基础的病害和加固状况进行了评估。评估结果和设定状态变化吻合,从而证明了基于动力响应灵敏度的评估方法也适用于桥梁基础状态评估。
[Abstract]:At present, the theory of structural dynamic damage identification is mostly focused on the superstructure of the bridge, and the research on the pier and foundation of the substructure is less. Based on the existing research, this paper presents a method for evaluating the piers and foundation states of railway piers by using the sensitivity analysis of dynamic response. The main contents and achievements of this paper are as follows: (1) the research status of various structural damage identification methods is briefly introduced, and the advantages and disadvantages of these methods are compared. The research difficulties and development directions of existing damage identification methods are summarized. (2) the model modification method based on sensitivity analysis is discussed in detail. The damage identification theory based on sensitivity analysis and the solution method of sensitivity equation are expounded. (3) the finite element model of bridge pier considering beam mass and foundation constraints is established. The reduction of pier stiffness and the improvement of pier stiffness are analyzed. The results show that the damage assessment method based on dynamic response sensitivity analysis can accurately identify the location and degree of pier state change. (4) different excitation positions and response point positions are selected. The damage identification of the structure is carried out, and the influence of the excitation position and the response point position on the identification result is analyzed and summarized. The reasonable arrangement of measuring points is given. (5) the disease and reinforcement condition of bridge foundation are evaluated by the proposed method. The evaluation results are consistent with the change of the set state, which proves that the method based on the sensitivity of dynamic response is also suitable for the evaluation of bridge foundation state.
【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】：U443.22;U446
本文编号：2146250
[Abstract]:At present, the theory of structural dynamic damage identification is mostly focused on the superstructure of the bridge, and the research on the pier and foundation of the substructure is less. Based on the existing research, this paper presents a method for evaluating the piers and foundation states of railway piers by using the sensitivity analysis of dynamic response. The main contents and achievements of this paper are as follows: (1) the research status of various structural damage identification methods is briefly introduced, and the advantages and disadvantages of these methods are compared. The research difficulties and development directions of existing damage identification methods are summarized. (2) the model modification method based on sensitivity analysis is discussed in detail. The damage identification theory based on sensitivity analysis and the solution method of sensitivity equation are expounded. (3) the finite element model of bridge pier considering beam mass and foundation constraints is established. The reduction of pier stiffness and the improvement of pier stiffness are analyzed. The results show that the damage assessment method based on dynamic response sensitivity analysis can accurately identify the location and degree of pier state change. (4) different excitation positions and response point positions are selected. The damage identification of the structure is carried out, and the influence of the excitation position and the response point position on the identification result is analyzed and summarized. The reasonable arrangement of measuring points is given. (5) the disease and reinforcement condition of bridge foundation are evaluated by the proposed method. The evaluation results are consistent with the change of the set state, which proves that the method based on the sensitivity of dynamic response is also suitable for the evaluation of bridge foundation state.
【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】：U443.22;U446
【参考文献】
相关期刊论文 前4条
1 殷志祥;徐文杰;毛丽强;;曲率模态小波法用于网壳结构损伤的识别和定位[J];地震工程与工程振动;2009年04期
2 韦灼彬;高屹;;小波分析在钢框架损伤识别中的应用研究[J];海军工程大学学报;2012年05期
3 崔飞,袁万城,史家钧;基于静态应变及位移测量的结构损伤识别法[J];同济大学学报(自然科学版);2000年01期
4 易伟建,刘霞;混凝土板的裂缝诊断[J];振动工程学报;2002年02期
，本文编号：2146250
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2146250.html
