【作者】 黄胜前；

【导师】 杨永清；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 随着结构的自然老化和损伤积累，也由于车辆荷载的增加和养护维修的欠缺等不利因素的影响，既有桥梁不满足规定功能要求的问题已越来越普遍。桥梁的评估方法及加固技术已逐渐成为工程界关注的热点问题。本文在总结前人研究成果的基础上，对现有的桥梁综合评估方法进行了一些改进，并结合预应力混凝土连续刚构桥的特点，初步开发了预应力混凝土连续刚构桥综合评估系统软件。主要内容如下：1、论述了桥梁评估的研究意义，阐述了桥梁评估的基本概念，对现有的桥梁评估方法及桥梁评估系统作了比较详尽的综述和评价，引出本文研究的问题。2、阐述了模糊集合的基本概念和方法、模糊综合评估的基本思想与步骤及处理模糊综合评估结果的方法，介绍了采用层次分析法及在层次分析法中引入群组判断确定指标权重的方法，探讨了变权原理及其在模糊综合评估中的应用。3、建立了预应力混凝土连续刚构桥的综合评估模型，提出了其底层指标等级向量的确定方法，论述了基于层次分析法和变权原理的多级模糊综合评估法在预应力混凝土连续刚构桥综合评估中的应用。4、以Visual C++6.0为开发平台，初步开发了预应力混凝土连续刚构桥综合评估系统软件。5、通过桥梁综合评估实例，检验了本文建立的预应力混凝土连续刚构桥综合评估系统的应用效果。更多还原

【Abstract】 As the structure of bridges becomes naturally old and is accumulatively damaged, and the increase of vehicles and the deficiency of bridge maintenance have caused bad effects, it is commonly known that most of the existed bridges cannot satisfy the requirement. So the engineering field has paid great attention to the assessment methods and reinforcement techniques of bridges gradually.Based on earlier research, a system is established and a software is programmed, for the assessment of prestressed concrete continuous rigid-frame bridge, by improving the assessment methods for existed bridges and integrated with the trait of prestressed concrete continuous rigid-frame bridge. The main contents of the thesis are as follows:Firstly, the purpose and meaning of bridge assessment are discussed, its basic concepts are explained, the assessment methods and assessment system for existed bridges are reviewed and evaluated in detail, and the issues to be studied are elicited consequently.Secondly, the basic concept and methods of fuzzy set, and the basic principle and approach of fuzzy compositive assessment, and the methods that deals with the results of fuzzy compositive assessment are explained; The methods to calculate indicator weight by analytic hierarchy process and bringing group judgements in it are introduced; The variable weight principle and its application in fuzzy compositive assessment are discussed.Thirdly, the compositive assessment model of prestressed concrete continuous rigid-frame bridge is buit up; The way to determine the rank vector of lower level indicator is presented; The application of multilevel fuzzy compositive assessment methods in evaluation of prestressed concrete continuous rigid-frame bridge, which based on analytic hierarchy process and variable weight principle, is discussed.Fourthly, based on Visual C++ 6.0, the software of compositive assessment system for prestressed concrete continuous rigid-frame bridge is developed preliminarily.Finally, the application result of the compositive assessment system, which is buit up for prestressed concrete continuous rigid-frame bridge, is tested by an example.更多还原