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Crack-dependent response of structural steel members repaired with cfrp.

机译：cfrp修复的结构钢构件的裂纹相关响应。

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摘要

Cracking of the lower flange in steel-girder bridges is a critical consideration because it will influence flexural behavior such as load-carrying capacity. Timely rehabilitation will save long-term repair costs and warrant sustainable performance. Carbon-fiber-reinforced polymer (CFRP) is a promising material to repair damaged steel members. This non-metallic reinforcement provides a number of benefits when compared to traditional repair materials (e.g., welded steel plates) for deteriorated steel girders: for example, a favorable strength-to-weight ratio, resistance to corrosion and fatigue, rapid installation in practice, and reduced long-term maintenance expenses. Although applying CFRP to steel members has recently attracted the rehabilitation community, its contribution to the behavior of repaired members is not fully understood. Very limited information about the interaction between the level of initial damage in steel girders and CFRP-repair is available, and also, scant research about the long-term performance and environmental durability for such repaired members has been done. This study addresses these identified research gaps based on a two-phase experimental program. The first phase focuses on CFRP-repaired steel beams having various levels of initial damage (representing multiple stages of fatigue crack propagation). The second phase is focused on testing the repaired beams when subjected to various levels of sustained intensity and cold temperature. A three-dimensional non-linear finite element (FE) model is developed to predict the flexural behavior of CFRP-repaired beams, including CFRP debonding and crack propagation across the critical section of the repaired beams. Also, the FE method is used and regression equations are proposed to predict the static strength of standard steel W Shapes repaired with CFRP, taking into consideration the material and geometric properties.
机译：钢梁桥下部法兰的开裂​​是一个关键的考虑因素，因为它将影响挠曲行为，例如承载能力。及时的修复将节省长期维修成本并保证可持续的性能。碳纤维增强聚合物（CFRP）是修复受损钢构件的有前途的材料。与用于老化钢梁的传统维修材料（例如，焊接钢板）相比，这种非金属增强材料具有许多优势：例如，良好的强度重量比，耐腐蚀和抗疲劳性，在实践中快速安装，并减少了长期维护费用。尽管最近将CFRP应用于钢制构件已吸引了康复界的注意，但其对修复构件行为的贡献尚不完全清楚。关于钢梁的初始损伤水平与CFRP修复之间的相互作用的信息非常有限，而且对于这种修复构件的长期性能和环境耐久性的研究很少。这项研究基于两阶段的实验计划，解决了这些已确定的研究空白。第一阶段着重于CFRP修复的钢梁，其初始损伤程度不同（代表疲劳裂纹扩展的多个阶段）。第二阶段的重点是在承受各种水平的持续强度和低温时测试修复后的光束。建立了三维非线性有限元（FE）模型，以预测CFRP修复梁的弯曲行为，包括CFRP脱胶和裂纹在修复梁的关键部分的扩展。此外，考虑到材料和几何特性，使用有限元方法，并提出回归方程来预测用CFRP修复的标准W型钢的静态强度。

著录项

  • 作者

    Hmidan, Amer.;

  • 作者单位

    North Dakota State University.;

  • 授予单位 North Dakota State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 262 p.
  • 总页数 262
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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