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The Role of Structural Health Monitoring in Bridge Assessment and Management.

机译：结构健康监测在桥梁评估和管理中的作用。

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摘要

The past several decades have witnessed civil infrastructure design and assessment shift from deterministic methodology to probabilistic methodology. Structural Health Monitoring develops so rapidly that it is likely to become a predominant emerging technology to challenge and improve traditional way of design, assessment and management of civil infrastructure.;The objective of this study is to explore the approaches combining the monitoring technology with the reliability method to assess and predict the structural performance under uncertainty. Concepts and different approaches have been applied on two steel trusses and two existing bridges to reach the objective.;The time-dependent component reliability is investigated in the first two truss models to determine the most critical member. It is assumed that components with different material properties will deteriorate with various rates. Time-variant reliability is computed at discrete times. Reliability index, as one of the performance indicators including the uncertainties in resistance and loads, is used to estimate the component performance during its lifespan. Performance thresholds are established as the warning which provides the reference for scheduling monitoring inspection and making maintenance decisions. Due to the high cost of using monitoring technology, the search of an optimal balance between economic budget and safe performance is in great demand.;In the study of Commodore Barry Bridge, field monitoring data is used to find probability density functions of equivalent stress range to assess and predict the bridge's fatigue reliability. Three distribution types are compared by using goodness-of-fit test and the optimum one is selected to determine the parameters for reliability computation. The lifetime performance of six critical bridge members and their effects on the whole structure are investigated.;The concept of the statistics of extremes is applied in the I-39 Northbound Wisconsin River Bridge to improve the performance prediction and assessment based on monitoring data. Two methods to account for the epistemic uncertainty based on 80 days of monitoring data are used in the reliability analysis.
机译：在过去的几十年中，民用基础设施的设计和评估已从确定性方法转变为概率性方法。结构健康监测发展如此之快，以致有可能成为挑战和改善传统的民用基础设施设计，评估和管理方式的新兴技术。本研究的目的是探索将监测技术与可靠性相结合的方法。不确定性下评估和预测结构性能的方法在两个钢桁架和两个现有的桥梁上应用了概念和不同的方法来达到目标​​。在前两个桁架模型中研究了随时间变化的构件可靠性，以确定最关键的构件。假定具有不同材料特性的组件将以各种速率劣化。时变可靠性是在离散时间计算的。可靠性指标是包括电阻和负载的不确定性在内的性能指标之一，用于估计组件在其使用寿命期间的性能。建立性能阈值作为警告，为调度监视检查和制定维护决策提供参考。由于使用监测技术的成本高昂，在经济预算和安全性能之间寻求最佳平衡的需求非常迫切。；在Commodore Barry Bridge的研究中，现场监测数据用于查找等效应力范围的概率密度函数。评估和预测桥梁的疲劳可靠性。通过使用拟合优度检验比较三种分布类型，并选择最佳分布类型以确定可靠性计算的参数。研究了六个关键桥梁构件的终生性能及其对整个结构的影响。极端统计的概念被应用在威斯康星州I-39北行河大桥上，以改善基于监测数据的性能预测和评估。在可靠性分析中，使用了两种基于80天监控数据来解决认知不确定性的方法。

著录项

  • 作者

    Zou, Yingjun.;

  • 作者单位

    Lehigh University.;

  • 授予单位 Lehigh University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2011
  • 页码 167 p.
  • 总页数 167
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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