基于可拓理论对混凝土梁桥可靠性评价的研究

发布时间：2018-05-09 07:18

本文选题：可拓学 + 桥梁可靠性评价　；参考：《沈阳建筑大学》2014年硕士论文

【摘要】：本文阐述了目前关于国内外桥梁检测方法与评估成果,并在对钢筋混凝土梁桥的一些常见病害进行机理分析,在此基础上对既有桥梁工作状态和可靠性进行了进一步研究。首先对目前桥梁评估方法研究的现状进行了系统介绍和归纳总结；其次论述了AHP法和可拓学评价的基本原理及其在桥梁状态评估中的应用,拓展了可拓理论的应用领域,并为钢筋混凝土梁桥结构可靠性评估提供了新的方法；再次根据混凝土简支梁桥的结构特点来划分桥梁系统,从桥梁可靠性的三个方面建立评估的层次结构模型。在此基础上,提出了各指标权重的确定方法,并结合现有资料及相关规范,讨论并确定出各底层指标评估的待评物元；最后,结合实际工程应用可拓评价原理进行系统的评价。本文将可拓学理论与桥梁可靠性评价相结合,基于可拓集合论、物元理论、以及关联函数的运算,进而建立梁桥的可靠性评价的可拓学模型。通过对营口民兴河桥进行桥梁检测,以及把调查的资料进行收集与整理之后,从而掌握了能够影响该桥的可靠性指标的相应特征。通过考虑桥梁的可靠性评价影响因素的复杂性与多样性,通过桥梁状态评定的角度出发,我们进而选取了能够反映民兴河桥的可靠性参数进行评价。对桥梁状态评定等级的相应关联度进行计算,对营口民兴河桥的桥梁可靠性状态进行了相应的可拓学评价,并且把评价的结果和其它的评价方法对比起来,进行分析,综合得出可拓学评价结果能够较完善、准确的反映营口民兴河桥的桥梁可靠性状态的结论,从而为桥梁病害防治与维修加固提供参考和理论依据。
[Abstract]:In this paper, the detection methods and evaluation results of bridges at home and abroad are described, and the mechanism of some common diseases of reinforced concrete beam bridges is analyzed. On this basis, the working state and reliability of existing bridges are further studied. Firstly, the paper systematically introduces and summarizes the current research status of bridge evaluation methods, and then discusses the basic principles of AHP method and extension evaluation and its application in bridge state evaluation, which expands the application field of extension theory. It also provides a new method for reliability evaluation of reinforced concrete beam bridge, and then divides the bridge system according to the structural characteristics of concrete simply supported beam bridge, and establishes the hierarchical structure model from three aspects of bridge reliability evaluation. On this basis, the method of determining the weights of each index is put forward, and the evaluation elements of each underlying index are discussed and determined according to the existing data and relevant norms. Finally, the system evaluation is carried out with the application of extension evaluation principle in practical engineering. In this paper, the extension theory is combined with the bridge reliability evaluation, and based on the extension set theory, matter-element theory and the operation of the correlation function, the extension model of the reliability evaluation of the beam bridge is established. Through the bridge detection of Yingkou Minxing River Bridge and the collection and arrangement of the investigation data, the corresponding characteristics which can affect the reliability index of the bridge are grasped. By considering the complexity and diversity of the factors influencing the reliability evaluation of the bridge, and from the point of view of the bridge state evaluation, we select the reliability parameters which can reflect the Minxing River Bridge for evaluation. The corresponding correlation degree of the evaluation grade of bridge state is calculated, and the reliability of the bridge of Minxing River Bridge in Yingkou is evaluated by extension. The results of evaluation are compared with other evaluation methods, and the results are analyzed. It is concluded that the evaluation results of extenics can be perfect and can accurately reflect the reliability state of the bridge of Yingkou Minxing River Bridge, thus providing a reference and theoretical basis for the prevention and treatment of bridge diseases and the maintenance and reinforcement of the bridge.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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