结构线形对桥梁技术状况评价的量化研究

发布时间：2018-03-30 09:15

本文选题：量化评价　切入点：下挠模式　出处：《重庆交通大学》2014年硕士论文

【摘要】：桥梁结构由于受到多种内外因素的影响，结构线形或多或少都会发生一定变化。目前国内相关规范对于结构线形这一评价指标基本都是采用定性的方法进行描述，即使有的规范已有一定的量化分析成果，但仍不能满足对既有桥梁的技术状况评估要求。通过选取国内两种较为常见的梁桥和拱桥，利用midas civil有限元软件建立了各自具有代表性的桥梁分析模型，，模拟桥梁结构成桥状态时可能出现的多种结构线形变化情形，研究结构线形变化后桥梁结构内力的变化规律，并建立相应的层次分析模型，提出通过引入线形影响因子参数来探讨基于结构线形变化后的桥梁技术状况评价方法。本文主要研究内容有以下几方面： ①简明介绍了既有桥梁技术状况量化评价的意义、重要性以及国内外研究历程；并简要介绍了国内现有桥梁技术状况评价规范中的评价方法、理论和存在的一些不足。 ②简要介绍了桥梁结构线形变化的三种常见形式，并从预应力损失、混凝土收缩徐变、设计理论、施工和后期运营管理分析了桥梁结构线形后期发生变化的多种原因。 ③介绍了拱桥结构主拱圈下挠的几种模式，并从中选取折线型下挠模式完成主拱圈各截面下挠量值的分配。利用midas civil软件建立拱桥的有限元分析模型，模拟了在不同下挠量值和下挠区段范围内，主拱圈整体下挠和局部下挠对拱桥结构各控制截面内力的影响及其内力变化规律。 ④简要介绍了梁桥结构下挠的两种可能模式，重点介绍和推导了挠曲线下挠模式下的计算公式，给出了当下挠的最大量值和下挠区段范围已知时，挠度值在各个截面的计算方法。利用midas civil软件建立梁桥的有限元分析模型，模拟了在不同下挠量值和下挠区段范围内，主梁整体下挠和局部下挠对梁桥结构各控制截面内力的影响及其内力变化规律。 ⑤分析了拱桥和梁桥的结构线形指标在我国桥梁技术状况评价体系中的现状，分别建立了拱桥和梁桥的层次分析模型，并将结构线形指标单独进行分析，提出通过引入结构线形影响因子参数αg和αl来探讨基于结构线形指标量化后的桥梁技术状况的评价方法。
[Abstract]:Due to the influence of many internal and external factors on bridge structure, the structure alignment will change more or less. At present, the evaluation index of structure alignment is described by qualitative method in domestic relevant codes. Even though some codes have some quantitative analysis results, but still can not meet the existing bridge technical status evaluation requirements. Through the selection of two more common domestic girder bridge and arch bridge, By using midas civil finite element software, the representative bridge analysis models are established to simulate the changes of various structural lines that may occur in the state of bridge formation, and to study the variation law of the internal force of the bridge structure after the change of the structure line shape. The corresponding analytic hierarchy process (AHP) model is established, and the evaluation method of bridge technical condition based on the change of structure alignment is put forward by introducing the parameters of linear influence factors. The main contents of this paper are as follows:. The main contents are as follows: (1) the significance, importance and research history of the quantitative evaluation of the existing bridges' technical status are briefly introduced, and the evaluation methods, theories and some shortcomings in the existing domestic norms for the evaluation of the technical status of bridges are briefly introduced. This paper briefly introduces three kinds of common forms of bridge structure linear change, and analyzes the causes of bridge structure linear shape change in the later stage from the aspects of prestress loss, concrete shrinkage and creep, design theory, construction and later operation management. 3. This paper introduces several modes of arch ring deflection of arch bridge structure, and selects the fold-line downwarping mode to distribute the deflection value of each section of the main arch ring. The finite element analysis model of arch bridge is established by using midas civil software. The effects of the global and local torsion of the main arch ring on the internal forces of the control sections of the arch bridge structure and the variation of the internal forces are simulated. In this paper, two possible modes of deflection under beam and bridge structure are briefly introduced, and the formulas for calculating deflection under deflection curve are emphatically introduced and deduced, and the maximum value of current deflection and the range of deflection section are given when the maximum value of current deflection and the range of deflection section are known. The finite element analysis model of beam bridge is established by using midas civil software. The influence of the global and local deflection of the main beam on the internal forces of each control section of the girder bridge and the variation of the internal forces. 5. The present situation of the structural alignment index of arch bridge and beam bridge in the evaluation system of bridge technical condition in China is analyzed. The analytic hierarchy process (AHP) model of arch bridge and beam bridge is established, and the structural alignment index is analyzed separately. The evaluation method of bridge technical condition based on the quantization of structural linear index is proposed by introducing the parameters 伪 g and 伪 l of the structural linear influence factor.
【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】：U441

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