基于层次分析法研究桥梁健康状况的智能评估系统开发

发布时间：2018-01-14 05:18

本文关键词：基于层次分析法研究桥梁健康状况的智能评估系统开发　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：现代悬索桥自初次建立起便具有跨度大，跨越能力强的优点，随着桥梁建设水平的不断提高，跨度也不断增大，而且结构形式也日趋复杂，桥梁健康监测系统的建立也显得尤为必要。另外，人们对大跨桥梁的安全性、耐久性和正常使用功能也越来越关注，这就使得桥梁结构的健康状况评估的研究和应用成为行业里非常活跃的研究方向。青草背长江大桥位于重庆三环高速公路涪陵李渡至南川双河口段，该路段交通流量大，桥梁负担大，因此桥梁强度和刚度会随时间增加而降低，这将会影响安全行车，也会缩短桥梁使用寿命。因此，对青草背长江大桥健康状况的评估能为桥梁的寿命产生积极的作用。本文以青草背长江大桥为工程背景，采用利用传感器实测数据对其建立评估系统，并由此得出该桥技术状况评估软件。本文的研究工作主要内容如下：首先，采用有限元软件Midas civil2010建立全桥模型，对桥梁结构进行静力分析，定义四种荷载组合，查询主梁、桥塔、主缆、吊杆在荷载组合作用下的应力及位移，计算出各构件的应力阀值、位移阀值和索力阀值；其次，拟定桥梁健康监测系统的实施方案，确定需要布设传感器的关键部位，进行桥梁的实时在线监测，并返回实测数据，将实测数据进行统计与分析；再次，基于层次分析法的理论将评估系统划分层次，再通过专家问卷调查的方式获取各层指标的权重，，再将理论值与实测值进行比较，引入模糊理论，对各个构件进行评分，将所得评分与权重的乘积逐层累加，最后获得完整的具有分值的评估系统；最后，将所得评估系统中的各项数据作为技术支持，投入到桥梁健康状况智能评估系统的开发中，并最终开发出评估软件。将之前步骤中所得数据及评估系统作为技术支持，投入到该桥技术状况评估软件的开发中，并最终开发出评估软件，从而实现该桥在线状态下的状态评估。
[Abstract]:Modern suspension bridge has the advantages of long span and strong span since it was first built. With the continuous improvement of the bridge construction level, the span is also increasing, and the structure form is becoming more and more complex. In addition, people pay more and more attention to the safety, durability and normal function of long-span bridges. This makes the research and application of bridge structure health assessment become a very active research direction in the industry. Qingcaobei Yangtze River Bridge is located in the section between Fuling and Shuanghekou of Chongqing third Ring Road Expressway. This section has a large traffic flow and a large bridge burden, so the strength and stiffness of the bridge will decrease with the increase of time. This will affect the safe driving and shorten the service life of the bridge. Therefore, the assessment of the health condition of the Qingcaobei Yangtze River Bridge can play a positive role in the bridge's life. In this paper, the Qingcaobei Yangtze River Bridge is taken as the engineering background, and the evaluation system is established by using the measured data of the sensor, and the evaluation software of the bridge's technical condition is obtained. The main contents of this paper are as follows: Firstly, the finite element software Midas civil2010 is used to establish the full bridge model, to analyze the static force of the bridge structure, to define four kinds of load combinations, to query the main beam, the bridge tower and the main cable. The stress and displacement of the suspender under the combined load are calculated, and the stress threshold, displacement threshold and cable force threshold of each member are calculated. Secondly, the implementation scheme of the bridge health monitoring system is drawn up, the key parts of the bridge health monitoring system are determined, the real-time on-line monitoring of the bridge is carried out, and the measured data are returned, and the measured data are counted and analyzed. Thirdly, based on the theory of analytic hierarchy process, the evaluation system is divided into different levels, and then the weight of each layer index is obtained by expert questionnaire, and then the theoretical value is compared with the measured value, and the fuzzy theory is introduced. Each component is graded, the product of the score and weight is accumulated layer by layer, and finally a complete evaluation system with score is obtained. Finally, the data of the evaluation system is used as the technical support to develop the intelligent evaluation system of bridge health condition. Finally, the evaluation software is developed. The data and the evaluation system are used as the technical support, and the evaluation software is developed. In order to achieve the bridge online state evaluation.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.7

【参考文献】