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Design guidelines to FRP strengthened reinforced concrete structures: An emphasis on developing plate-end debonding failure criterion.

机译：FRP加固钢筋混凝土结构的设计准则：强调制定板端脱胶破坏准则。

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摘要

As an alternative to the overwhelming costs of rebuilding structures, rehabilitation of existing structures has become the focus of many researchers in the past few decades. To strengthen a reinforced concrete beam for flexure, fiber reinforced polymer (FRP) composites are usually bonded externally to the tension side of the structural element. Although, the usage of FRP has progressed and has been implemented in a number of projects worldwide, the behavior of FRP rehabilitated structures has yet to be appropriately considered for design purposes. For design, current design guidelines address conventional failure modes like concrete crushing, steel yielding and FRP rupture. However, the delamination failure modes like plate-end debonding and intermediate crack debonding are addressed by limiting the strain in FRP. Although a significant increase in strength can be achieved through externally bonded FRP, the limitation of strain imposed by design guidelines restricts the calculated degree of gain in strength. In this work, the strength is assessed by examining the stress state of concrete small element near FRP-concrete interface. A failure criterion is proposed based on 144 existing experimental data points.;Failure criterion for plate-end debonding is proposed by limiting the maximum principal stress to the modified tensile strength of the concrete. With the application of theory of elasticity, the interfacial shear stress and interfacial normal stress at the FRP-concrete interface established by different researchers were investigated to derive the critical shear stress and critical normal stress. Critical shear stress and critical normal stress are derived by considering the critical stress state of a concrete small element in the vicinity of the bond interface. Considering the biaxial stress state of the concrete small element, maximum principal stress is calculated using proposed critical shear stress and critical normal stress along with flexural stress. The concrete tensile strength with a modification factor for FRP plate-end debonding is suggested by considering 144 four point bending test data failed in plate-end debonding. Finally, a design method based on developed failure criterion is proposed for FRP strengthened RC structures.
机译：作为重建结构的巨大成本的替代方法，在过去的几十年中，对现有结构的修复已成为许多研究人员关注的焦点。为了增强钢筋混凝土梁的挠曲性，通常将纤维增强聚合物（FRP）复合材料外部粘合到结构元件的受拉侧。尽管FRP的使用已取得进展，并且已在世界范围内的许多项目中得到了实施，但是FRP修复结构的性能尚未为设计目的进行适当考虑。对于设计，当前的设计准则处理常规的破坏模式，例如混凝土压碎，钢筋屈服和FRP破裂。但是，通过限制FRP中的应变可以解决诸如板端剥离和中间裂纹剥离之类的分层失败模式。尽管通过外部粘结的FRP可以显着提高强度，但设计准则所施加的应变限制限制了强度的计算得出的程度。在这项工作中，强度是通过检查靠近FRP-混凝土界面的混凝土小构件的应力状态来评估的。根据已有的144个试验数据点，提出了一种破坏准则。通过将最大主应力限制在混凝土的抗拉强度上，提出了板端剥离的破坏准则。运用弹性理论，研究了不同研究人员建立的FRP-混凝土界面处的界面剪应力和界面正应力，得出了临界剪应力和临界正应力。临界剪切应力和临界法向应力是通过考虑粘结界面附近的混凝土小构件的临界应力状态得出的。考虑到混凝土小构件的双轴应力状态，使用建议的临界剪应力和临界法向应力以及挠曲应力来计算最大主应力。通过考虑144个在板端脱胶中失败的四点弯曲试验数据，提出了具有修正因子的FRP板端脱胶混凝土抗拉强度。最后，提出了一种基于失效准则的FRP加固RC结构设计方法。

著录项

  • 作者

    Vuddandam, Rajesh Babu.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 127 p.
  • 总页数 127
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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