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首页> 外文学位 >Assessment of FRP composite strengthened reinforced concrete bridge structures at the component and systems level through progressive damage and non-destructive evaluation (NDE).
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Assessment of FRP composite strengthened reinforced concrete bridge structures at the component and systems level through progressive damage and non-destructive evaluation (NDE).

机译：通过渐进式破坏和无损评估（NDE）对FRP复合材料增强的钢筋混凝土桥梁结构进行构件和系统水平评估。

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摘要

There is growing use of FRP composite materials in the civil infrastructure for rehabilitation of deficient bridge components including deck slabs and girders. However assessment of the effectiveness of rehabilitation over time and monitoring the progression of damage or change in load paths between the structural components, caused by sequential strengthening of the components, has not been undertaken to date. Investigation was first carried out at "component level" on both unstrengthened and field-rehabilitated slab specimens cut out from a major highway bridge. The slabs were tested to failure and the progression of damage was characterized through instrumentation and NDE. The test data on the failure modes and capacity loads were correlated to the available analytical models and design guidelines. The test capacity was also correlated to the bridge deck capacity based on local-global modeling. Research at the "systems level" was then undertaken, in which a three-girder two-span bridge deck system was tested to simulate behavior under field loading in which the deck slabs are found to be susceptible to punching shear type failures and the longitudinal girders are usually found to be deficient in terms of shear demand. The objective of the study was to evaluate damage progression in the deck slabs and the longitudinal girders under simulated truck load and to detect changes in the overall response of structure at systems level caused by strengthening of individual components that might cause other components to reach their critical limit states under the higher load demands which can be resisted by the strengthened components. NDE techniques, including IR thermography and forced vibration based dynamic modal tests, were evaluated as means to quantify the damage localization and progression under simulated field loading as well as to quantitatively monitor changes in the response of the components, caused by subsequent modifications of the structure, at systems level. The test data on the failure modes, capacity loads and specimen behavior were correlated to the both analytical and numerical models. Based on the limitations of the available design guideline for FRP strengthening, a modified design methodology was proposed for FRP strengthening of slab-girder systems.
机译：在民用基础设施中，越来越多的FRP复合材料用于修复桥面板和大梁等不足的桥梁部件。然而，迄今为止，尚未进行对随着时间的推移进行修复的有效性的评估，并监测由于构件的顺序加固而导致的构件构件之间的损坏或载荷路径变化的进程。首先从大型公路桥梁上切出的未加强和现场修复的平板标本都在“组件级”上进行了研究。对板进行了破坏测试，并通过仪器和无损检测对损坏的进程进行了表征。有关故障模式和容量负荷的测试数据与可用的分析模型和设计指南相关。根据局部-全局建模，测试能力还与桥面板能力相关。然后进行了“系统级”的研究，其中测试了三梁两跨桥面甲板系统，以模拟现场载荷下的行为，在该情况下，发现甲板板容易受到冲剪型破坏和纵向梁的影响。通常发现在剪切需求方面不足。该研究的目的是评估在模拟卡车载荷下甲板板和纵向大梁的破坏进程，并检测由于单个组件的增强而引起的系统整体结构整体响应的变化，这些变化可能导致其他组件达到临界状态。在更高的负载需求下可以达到极限状态，而这种增强状态可以通过增强组件来抵抗。评估了无损检测技术，包括基于红外热像仪和基于强迫振动的动态模态测试，以量化在模拟场载荷下的损伤定位和进展，以及定量监测由结构的后续修改引起的组件响应变化。 ，在系统级别。有关失效模式，容量载荷和样本行为的测试数据与分析模型和数值模型都相关。基于现有的玻璃钢加固设计指南的局限性，提出了一种改进的设计方法，用于板梁系统的玻璃钢加固。

著录项

  • 作者

    Ghosh, Kumar Kanti.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Civil.; Transportation.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 480 p.
  • 总页数 480
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;综合运输;
  • 关键词

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