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Methodology for uncertainty-based inspection planning of concrete bridge decks using mechanistic models of crack formation and propagation.

机译：基于裂纹形成和扩展的机械模型的混凝土桥面板基于不确定性的检查计划的方法。

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摘要

The bridge inspection program in the United States started in 1971 following the collapse of the Silver Bridge in Ohio. Since then, bridges have generally been inspected every two years. This uniform inspection interval for all bridges is not the most efficient system for conducting inspections because many bridges do not require inspections this frequently, and leads to unnecessary use of inspection resources on bridges that do not require them. Efforts toward changing the bridge inspection program to a risk-based program are being made. Such a program would allow for bridge inspection timing to be based on each particular bridge's need, and each bridge would then be inspected for the components that present the highest risk to the structure.;The research presented herein focuses on using the uncertainty in the current condition of concrete bridge decks to plan inspection timing, and to plan inspection type based on limited resources. A mathematical program called Concrete Deck Cracking Probability Model (CDCPM) is written in MATLAB to model the uncertainty in the occurrence of transverse cracking and delamination in the deck. Through literature review, mechanistic models of the processes that affect cracking are determined and implemented in the program. Using Monte Carlo simulations, the uncertainty in the occurrence of cracking and delamination is analyzed based on the input parameter uncertainty. The effect of different climates and mechanistic models on the prediction of cracking is explored using CDCPM. This model is then applied to a bridge in Larimer County, Colorado to see how the results compare to actual inspection results, and then the model is used to plan a future delamination inspection on the bridge. Another scenario is investigated where CDCPM is used together with uncertainty forecast plots to allocate inspection resources to two bridge decks.;CDCPM revealed that the uncertainty in the current bridge condition is heavily influenced by the mechanistic models chosen for the analysis, as well as some of the parameters used in the models. The surface chloride content has a large effect on the delamination of the concrete deck, while the relative humidity and ambient temperature for a given location can affect the probability of transverse cracking. Analysis of the Larimer County bridge inspection reports showed that the model can be good indicator of future damage to the deck. The model provides unique insight into inspection planning using uncertainty. Using the model output along with uncertainty forecast plots of different inspection methods, the inspection manager is provided with a useful planning tool that gives information on the effect of inspection methods on bridge condition assessment. Suggestions for implementing the bridge inspection plan for agency use is also provided.
机译：美国的桥梁检查计划始于1971年俄亥俄州银桥倒塌之后。从那时起，一般每两年检查一次桥梁。对于所有桥梁来说，这种统一的检查间隔并不是进行检查的最有效系统，因为许多桥梁不需要经常进行检查，并且会导致不必要的检查资源在不需要它们的桥梁上使用。正在努力将桥梁检查程序更改为基于风险的程序。这样的程序将允许根据每个特定桥梁的需要来确定桥梁的检查时间，然后将检查每个桥梁中对结构造成最高风险的组件。本文提出的研究着重于利用当前的不确定性。混凝土桥面板的状况以计划检查时间，并根据有限的资源计划检查类型。用MATLAB编写了一个称为混凝土甲板开裂概率模型（CDCPM）的数学程序，以模拟甲板中横向开裂和分层的不确定性。通过文献回顾，可以确定影响裂纹的过程的机械模型并在程序中实现。使用蒙特卡洛模拟，基于输入参数不确定性来分析开裂和分层发生中的不确定性。使用CDCPM探索了不同气候和机理模型对开裂预测的影响。然后将此模型应用于科罗拉多州Larimer县的一座桥梁，以查看结果与实际检查结果的比较，然后将该模型用于计划将来在桥梁上进行的分层检查。研究了另一种情况，其中CDCPM与不确定性预测图一起用于将检查资源分配给两个桥面板.CDCPM揭示了当前桥梁条件下的不确定性在很大程度上受到选择用于分析的力学模型的影响，以及一些模型中使用的参数。表面氯化物含量对混凝土面板的脱层有很大影响，而给定位置的相对湿度和环境温度会影响横向裂缝的可能性。对Larimer县桥梁检查报告的分析表明，该模型可以很好地指示将来对甲板造成的损坏。该模型使用不确定性提供了对检验计划的独特见解。使用模型输出以及不同检查方法的不确定性预测图，可以为检查管理器提供有用的计划工具，该工具可提供有关检查方法对桥梁状况评估的影响的信息。还提供了实施桥梁检查计划以供代理使用的建议。

著录项

  • 作者

    Sanders, Patrick.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Civil engineering.
  • 学位 M.S.
  • 年度 2015
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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