既有中小跨径石拱桥技术状况评定方法研究

发布时间：2018-04-23 17:20

本文选题：石拱桥 + 劣化　；参考：《长沙理工大学》2015年硕士论文

【摘要】：在交通路网中,桥梁一直以来都起着连接和沟通两岸交通的重要作用。而石拱桥在我国桥梁史上历来扮演着重要的角色,在我国桥梁数量上占有相当大的比例。由于各种原因,大量现役石拱桥承载能力及服役状况日益降低,因此针对石拱桥分析其典型病害并提出新的技术状况评估方法具有重大的意义,以便准确评估它的使用性能,以及确定是否需要实施外部介入手段(如维修、限载等),延长其服役寿命。本文主要研究内容及结论如下：(1)研究了《公路桥梁技术状况评定标准》、《城市桥梁养护技术规范》和《公路桥涵养护技术规范》三本规范中桥梁评定的方法及理论,阐述了三种方法各自的特点和不足之处。研究结果表明,相对其它两种方法而言,《公路桥梁技术状况评定标准》中的评定方法内容更加完善,且最容易被人接受,在桥梁评定工作中具有很好的应用前景,但仍存在多层次评定增加了评定工作量和成本等不足之处。(2)基于层次分析法计算石拱桥各构件权重值。阐述了层次分析法的基本原理及步骤,在收集桥梁的基本状况信息基础上,建立了石拱桥递阶层次评定结构模型,构造了各层的判断矩阵,用和法及MATLAB程序两种方法计算单一元素相对权重,即石拱桥构件权重分配值,并对判断矩阵进行了一致性检验。研究结果表明,和法能够满足石拱桥构件权重计算时的精度要求,且层次分析法可以较好的解决石拱桥权重问题。(3)将DERU法应用于石拱桥状况评估,通过研究石拱桥构件组成,制定了关于石拱桥的目视检测方法和表格；研究了石拱桥常见的病害类型,制定了石拱桥构件的DER值和U值的判定标准,并用状况指标值(CI)和优选指标值(PI)来初步反映目前石拱桥的使用状况；对CI和PI值的计算过程进行研究,为减小未设置构件对综合评估指标计算的影响,对其中的计算元素构件权重进行了重分配,得到改进的CI值和PI值。通过一座实腹式石拱桥算例,用三种方法对其进行状况评估,通过对比其计算过程和结果,可发现DERU法所具有的特点,研究结果表明,PI值相对于CI值、改进的CI和PI值相对于原CI和PI值能更好地反映桥梁使用状况,并验证了DERU评估法应用于石拱桥状况评估的可行性,为今后石拱桥状况评估提供参考。
[Abstract]:In the traffic network, bridges have always played an important role in connecting and communicating traffic between the two sides of the strait. Stone arch bridge has always played an important role in the history of bridges in our country and occupies a large proportion in the number of bridges in our country. Due to various reasons, the carrying capacity and service condition of a large number of active stone arch bridges are decreasing day by day. Therefore, it is of great significance to analyze the typical diseases of stone arch bridges and to put forward a new method for evaluating their technical conditions in order to accurately evaluate their performance. And to determine the need for external intervention means (such as maintenance, load limitation, etc.) to extend their service life. The main contents and conclusions of this paper are as follows: (1) the methods and theories of bridge assessment are studied in the following three codes: the Evaluation Standard of the Technical condition of Highway Bridges, the Technical specifications for maintenance of Urban Bridges and the Technical specifications for maintenance of Highway Bridges and culverts. The characteristics and shortcomings of the three methods are described. The results show that, compared with the other two methods, the contents of the evaluation methods in the Highway Bridge Technical status Assessment Standard are more perfect, and they are the most easily accepted, and have a good application prospect in the bridge evaluation work. However, there are still shortcomings in multi-level evaluation, such as increasing the workload and cost, etc.) based on AHP, the weight of each component of stone arch bridge is calculated. This paper expounds the basic principle and steps of the Analytic hierarchy process (AHP), on the basis of collecting the basic information of the bridge, establishes the hierarchy evaluation structure model of the stone arch bridge, and constructs the judgement matrix of each layer. The sum method and MATLAB program are used to calculate the relative weight of single element, that is, the weight distribution value of stone arch bridge component, and the consistency of judgment matrix is verified. The visual inspection method and table of stone arch bridge are established, the common disease types of stone arch bridge are studied, and the judging standard of DER value and U value of stone arch bridge component is established. The weight of the calculated elements is redistributed and the improved CI value and Pi value are obtained.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

【相似文献】