基于挠度影响线的连续梁桥结构损伤识别研究

发布时间：2018-06-28 19:32

本文选题：健康监测 + 损伤识别　；参考：《广州大学》2014年硕士论文

【摘要】：近年来，对桥梁结构健康监测的研究越来越受到人们的关注，这不仅因为桥梁数量的增加，更因为各个国家都面临着桥梁养护维修的高峰期。而损伤识别是健康监测的核心，它可以用来评估桥梁的健康状况并给出合理的维修养护意见。因此，进行损伤识别的研究具有重要的现实意义和社会价值。本文基于目前的工程结构损伤识别的研究现状，特别是基于影响线的损伤识别现状，分析了目前的损伤识别存在的问题，，针对连续梁桥，进行了基于挠度影响线的相关损伤识别研究。主要内容如下： ①介绍了论文的选题背景及研究意义，综述了工程结构损伤识别的研究现状及基于挠度影响线进行损伤识别的已有研究，阐明了本文的研究目的及主要工作。 ②推导了损伤前后一典型连续梁的挠度影响线的解析表达式，在理论上证明了这种识别方法的可行性。并由此建立了基于挠度影响线进行损伤识别的损伤指标。 ③基于挠度影响线，对连续梁桥进行损伤识别的数值模拟。通过单个损伤、多个损伤、不同损伤位置、不同损伤程度等工况下的识别效果，对比了各个损伤识别指标的优劣。 ④建立了基于挠度影响线的损伤识别方法的验证性实验。设计了具有不同损伤程度和不同损伤位置的连续梁模型，采用了一种新的测量仪器，并设计了相应的测试方法。测得了连续梁模型在不同工况下的挠度影响线，在实验室条件下证实了本文提出的识别方法的有效性。
[Abstract]:In recent years, more and more attention has been paid to the study of bridge structure health monitoring, not only because of the increase in the number of bridges, but also because every country is facing the peak period of bridge maintenance and repair. Damage identification is the core of health monitoring, it can be used to evaluate the health status of bridges and give reasonable maintenance advice. Therefore, the study of damage identification has important practical significance and social value. Based on the current research status of damage identification of engineering structures, especially the damage identification based on influence lines, this paper analyzes the existing problems of damage identification, aiming at continuous beam bridges. The related damage identification based on deflection influence line is studied. The main contents are as follows: 1. The background and significance of the thesis are introduced. The present research situation of engineering structure damage identification and the existing research on damage identification based on deflection influence line are summarized. The purpose and main work of this paper are expounded. 2 the analytical expression of deflection influence line of a typical continuous beam before and after damage is derived, and the feasibility of this method is proved theoretically. The damage index based on deflection influence line is established. 3 based on deflection influence line, the damage identification of continuous beam bridge is simulated. By single injury, multiple damage, different damage location, different damage degree and other working conditions, The advantages and disadvantages of each damage identification index are compared. 4 the verification experiment of damage identification method based on deflection influence line is established. The continuous beam model with different damage degree and different damage position is designed. A new measuring instrument is adopted and the corresponding testing method is designed. The deflection influence lines of the continuous beam model under different working conditions were measured. The validity of the proposed identification method was verified in the laboratory.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446;U448.215

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