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首页> 外文学位 >Use of CFRP overlays to repair fatigue damage in steel bridge girders and components.
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Use of CFRP overlays to repair fatigue damage in steel bridge girders and components.

机译：使用CFRP覆盖层来修复钢桥大梁和零部件中的疲劳损伤。

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摘要

Fatigue damage in steel girder bridges built prior to the mid-1980s is common due to distortion-induced fatigue. Different repair techniques have been developed and implemented to retrofit bridges of this era with existing fatigue damage. An experimental and analytical evaluation was conducted on the use of Carbon Fiber Reinforced Polymer (CFRP) as an alternative repair technique. Experimental testing was conducted on component specimens tested under pure tension loading conditions. Comparisons between specimens were based on the axial stiffness of the repaired specimen, a method commonly used in the Aerospace Engineering field. The analytical evaluation comprised of a suite of Finite Element models. A simplified steel girder section was modeled with two main objectives. The first was to evaluate the effect of bending and cross-frame forces on fatigue-crack location. The second was to compare the use of CFRP overlays as a repair technique to two techniques currently being used; drilling of crack-stop holes and attachment of steel splice plates. The intention of this research was to test the use of CFRP as a repair technique and validate its use for further testing more applicable to actual field conditions.;This thesis is organized into two primary parts. The first, entitled "Use of CFRP Overlays to Repair Fatigue Damage in Steel Plates under Tension Loading" details the experimental testing on component specimens. The second, entitled "Evaluation of Fatigue Damage Repair Measures in Welded Steel Plate Bridge Girders" details the analytical evaluation of different repair techniques and loading conditions. Procedural appendices have also been included to aid in future research in involving the testing of CFRP overlays. These appendices include the manufacture and attachment procedures of CFRP developed at the University of Kansas, an operational manual of sorts for the two testing machines used to complete Part 1 of this study, and the manufacture and attachment procedure of clamps used to control de-bonding of the CFRP overlays.
机译：由于变形引起的疲劳，1980年代中期以前建造的钢制梁桥的疲劳损伤很常见。已经开发并实施了各种修复技术，以利用现有的疲劳损坏来改造该时代的桥梁。对使用碳纤维增强聚合物（CFRP）作为替代修复技术进行了实验和分析评估。对在纯拉伸载荷条件下测试的组件样本进行了实验测试。标本之间的比较基于修复标本的轴向刚度，这是航空航天工程领域中常用的一种方法。分析评估包括一组有限元模型。以两个主要目标为模型来简化钢梁截面。首先是评估弯曲力和横框架力对疲劳裂纹位置的影响。第二个是将CFRP覆盖层作为一种修复技术与目前使用的两种技术进行比较。钻止裂孔并连接钢制拼接板。这项研究的目的是测试CFRP作为修复技术的用途，并验证其在进一步测试中的有效性，使其更适用于实际田间条件。本论文分为两个主要部分。第一个标题为“使用CFRP覆盖层修复拉伸载荷下钢板的疲劳损伤”，详细介绍了对组件试样的实验测试。第二篇题为“焊接钢板桥梁的疲劳损伤修复措施的评估”，详细介绍了不同修复技术和载荷条件的分析评估。程序性附录也已包括在内，以帮助未来的研究涉及CFRP覆盖层的测试。这些附录包括在堪萨斯大学开发的CFRP的制造和连接程序，用于完成本研究第1部分的两台测试机的各种操作手册以及用于控制脱胶的夹具的制造和连接程序的CFRP叠加层。

著录项

  • 作者

    Gangel, Regan E.;

  • 作者单位

    University of Kansas.;

  • 授予单位 University of Kansas.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2012
  • 页码 94 p.
  • 总页数 94
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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