论文总字数:50528字
摘 要
为确保大跨径斜拉桥的安全性、适用性、耐久性,对其建立科学合理的评估体系是十分必要的。目前斜拉桥评估数据来源主要有两方面:一是基于检查和检测的人工巡检系统;二是基于传感器实时检测的健康监测系统。但两个系统都有其各自的局限性。本文的研究目标即融合两方面的数据源,对大跨径缆索桥梁建立一套行之有效的桥梁评估体系。主要有以下工作:
1.基于安徽省安庆长江大桥的实际年检报告,利用现有的国家标准《公路桥梁技术状况评定标准》及江苏省地方标准《大跨径悬索桥和斜拉桥养护和评估规范》对现役实桥进行评估,并将结果进行对比,指出两种规范评估体系各自的不足及改进建议
2.基于层次分析法建立新的斜拉桥评估体系,通过大跨桥梁实际常见病害、现有规范的总结对比确定评估指标,将评估指标分为定性指标、定量指标和序列指标,并针对不同指标建立相应的评估标准。通过专家问卷调查得到指标权重。
3.基于斜拉桥的健康监测数据,对索力、挠度、位移等序列指标进行时间序列分析,提取这些指标的趋势变化,根据其趋势变化及上下限值对序列指标进行评估。
4.采用D-S证据理论和模糊综合评判方法,对斜拉桥最终的技术状态评估结果进行可信度分析,以避免传统的直接加权计算方法掩盖子指标之间的评分差异,得到评定等级的可信度分布。
5. 针对以上各过程,通过编制了计算程序,结合桥梁实际算例,验证了程序的正确性和适用性。
关键字:斜拉桥;养护管理;状态评估;AHP;决策融合
Abstract
In order to ensure the safety, applicability and durability of long-span cable-stayed bridges, it is necessary to establish a scientific and reasonable evaluation system. At present, there are two main sources of cable-stayed bridge evaluation data: one is the manual inspection system based on inspection and detection; the other is the health monitoring system based on real-time sensor detection. But both systems have their own limitations. The research objective of this paper is to integrate two data sources and establish an effective bridge evaluation system for long-span cable bridges. The main contents are as follows:
1. Based on the actual annual inspection report of Anqing Yangtze River Bridge in Anhui Province, the existing national standard "Evaluation Standard for Technical Conditions of Highway Bridges" (JTG/T H21-2011) and Jiangsu provincial standard "Standard for Maintenance and Evaluation of Long-span Suspension Bridges and Cable-stayed Bridges" (DB 32/T 1648-2010) are used to evaluate the existing bridges. The results are compared and the differences between the two evaluation systems are pointed out. Suggestions for improvement and improvement
2. A new evaluation system of cable-stayed bridges is established based on analytic hierarchy process (AHP). The evaluation indexes are determined by comparing the actual common diseases of long-span bridges and the existing specifications. The evaluation indexes are divided into qualitative, quantitative and sequential indexes, and corresponding evaluation standards are established for different indexes. The weights of indicators are obtained through expert questionnaire survey.
3. Based on the health monitoring data of cable-stayed bridges, the time series analysis of cable force, deflection, displacement and other sequence indicators is carried out, and the trend changes of these indicators are extracted, and the sequence indicators are evaluated according to their trend changes and upper and lower limits.
4. By using D-S evidence theory and fuzzy comprehensive evaluation method, the reliability of the final technical condition evaluation results of cable-stayed bridges is analyzed to avoid the traditional direct weighted calculation method masking the difference between sub-indicators and obtain the reliability distribution of the evaluation grade.
5. In view of the above processes, the calculation program is compiled by Matlab, and the correctness and applicability of the program are verified by the actual bridge example.
Key words: Cable-stayed bridge; Maintenance management; State assessment; AHP; Evidential reasoning approach;
目 录
摘要 I
Abstract II
第一章 绪论 1
1.1研究背景 1
1.2研究现状 2
1.2.1桥梁养护管理系统和健康监测系统现状 2
1.2.2国内外桥梁状态评估方法现状 2
1.2.3 桥梁状态评估存在的主要问题 3
1.3工程背景介绍 4
1.4 本文主要内容 7
第二章 大跨度斜拉桥运营状态评估标准的对比分析 8
2.1 概述 8
2.2 基于《公路桥梁技术状况评定标准》的状态评估 8
2.3 基于《大跨径悬索桥和斜拉桥养护规范》的状态评估 13
2.4基于“国标”与“地标”的评估体系对比 16
2.4.1斜拉索系统 16
2.4.2钢箱梁 17
2.5基于Matlab平台的“国标”与“地标”综合评估系统 18
2.6 本章小结 20
第三章 新的大跨径斜拉桥评估体系构建 21
3.1 概述 21
3.2 层次分析模型及评价指标的确立 21
3.3指标体系评定标准 23
3.3.1定性和定量指标评定标准 23
3.3.2评定标准融合及改进 24
3.4指标体系评定方法 26
3.4.1构件层的评价方法 26
3.4.2斜拉索系统的评价方法 29
3.4.3部件层的评价方法 29
3.4.4整体的评价方法 30
3.5指标体系权重确定 30
3.6 本章小结 34
第四章 桥梁序列指标的评定 35
4.1索力监测数据评价 35
4.1.1 索力数据采集 35
4.1.2 索力预测模型 38
4.1.3 识别季节性影响 39
4.1.4 索力评价方法 41
4.1.5 索力评价的Matlab交互界面 42
4.2位移监测数据评价 43
4.3应力监测数据评价 48
4.4 本章小结 50
第五章 不同指标体系的结果比对 52
5.1指标体系评定结果比对 52
5.2 基于Matlab平台的新指标体系综合评估 54
5.3本章小结 55
第六章 基于模糊综合评价和证据理论的全桥状态综合评估 56
6.1指标隶属度计算 56
6.2多级模糊综合评判 57
6.3 DS证据推理评定 59
6.3.1 DS证据理论基本原理 59
6.3.2 DS证据应用于桥梁等级状态评估 60
6.4 两种评估方式的Matlab实现 61
6.5 本章小结 64
第七章 总结 65
7.1本文的主要结论 65
7.2有待改进的方面 66
致 谢 67
参考文献 68
第一章 绪论
1.1研究背景
根据交通运输部统计资料显示,截至2018年底,我国公路桥梁已达85.15万座、5568.59万米,比上年增加1.90万座、342.97万米,其中特大桥梁5053座、902.69万米,大桥98869座、2637.04万米。然而在役桥梁安全及健康形势严峻,我国桥梁面临着总量大、周期短、隐患多、事故频发的挑战。由于管理养护观念滞后、养护技术局限、维护资金不足,桥梁病害日渐发展。一旦在役桥梁得不到科学、有效、及时的维护,将会导致桥梁功能降低,结构退化,直至引发桥梁安全事故,给国家财产和人民生命安全带来巨大损失。
剩余内容已隐藏,请支付后下载全文,论文总字数:50528字
该课题毕业论文、开题报告、外文翻译、程序设计、图纸设计等资料可联系客服协助查找;