不同载荷条件下基于应变监测的支承索损伤识别

发布时间：2018-11-20 14:34

【摘要】：本文致力于大型索支承结构的结构健康监测问题,以苏拉马都大桥为背景建立有限元模型(以下简称为S桥),基于线性关系假说,合理选取应变监测量,剔除不同形式载荷的不利影响,实现对受损索健康状态的准确识别。本文主要研究工作可概述如下：(1)以S桥为研究对象,对原有模型重新进行单元划分建立新的有限元模型,以满足不同形式载荷的加载条件。并针对不同载荷形式,选取若干种荷载工况,考虑其对结构健康状态识别的影响。(2)基于线性关系假说和多目标优化算法,研究了如何利用尽可能少的桥梁应变监测数据,实现了对受损索在不同损伤数目和不同损伤程度下的准确识别。同时能够剔除集中载荷变化对受损索健康状态识别的不利影响。(3)基于线性关系假说和多目标优化算法,研究了如何利用尽可能少的桥梁应变监测数据,实现了对受损索在不同损伤数目和不同损伤程度下的准确识别。同时能够剔除分布载荷变化对受损索健康状态识别的不利影响。(4)研究了不同载荷形式的组合工况对受损索识别的不利影响,对识别结果加以对比分析,通过试算选取合理的监测量以求弱化其不利影响,以实现对结构健康状态的准确识别。
[Abstract]:This paper is devoted to the problem of structural health monitoring of large cable-supported structures. Taking Sulamadu Bridge as the background, a finite element model (hereinafter referred to as "S Bridge") is established. Based on the hypothesis of linear relationship, the strain monitoring quantity is reasonably selected. Eliminate the adverse effects of different forms of load, and realize the accurate identification of the damaged cable health state. The main research work of this paper can be summarized as follows: (1) taking S bridge as the research object, a new finite element model is established by redividing the original model to meet the loading conditions of different forms of load. According to different load forms, several load conditions are selected, and their influence on structural health state identification is considered. (2) based on linear relation hypothesis and multi-objective optimization algorithm, how to use as few bridge strain monitoring data as possible is studied. The accurate identification of damaged cable under different damage number and different damage degree is realized. At the same time, it can eliminate the adverse effect of the change of concentrated load on the health status of damaged cable. (3) based on the hypothesis of linear relationship and the multi-objective optimization algorithm, the paper studies how to use as few bridge strain monitoring data as possible. The accurate identification of damaged cable under different damage number and different damage degree is realized. At the same time, it can eliminate the adverse effect of the change of distributed load on the identification of damaged cable health. (4) the adverse effects of different load forms on the identification of damaged cable are studied, and the identification results are compared and analyzed. Reasonable monitoring quantity is selected by trial calculation in order to weaken its adverse effect and realize the accurate identification of the health state of the structure.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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