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首页> 外文学位 >Sprayed glass fiber reinforced polymers in shear strengthening and enhancement of impact resistance of reinforced concrete beams.
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Sprayed glass fiber reinforced polymers in shear strengthening and enhancement of impact resistance of reinforced concrete beams.

机译：喷涂玻璃纤维增​​强聚合物可增强剪切力并增强钢筋混凝土梁的抗冲击性。

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摘要

Shear failure of reinforced concrete (RC) beams is often sudden and catastrophic. A timely shear strengthening of deficient RC beams is therefore critical in view of maintaining public safety.; In this dissertation, the effectiveness of externally bonded sprayed glass fiber reinforced polymer (Sprayed GFRP) in shear strengthening of RC beams under both quasi-static and impact loading was investigated. Direct comparisons were drawn with hand-applied, site-impregnated FRP fabric. To study RC beams under impact loads, a unique test setup was developed. In this setup, both the striking hammer and the specimen supports are instrumented and accelerometers are mounted on the specimen to accurately measure specimen inertial loads and to provide a proper dynamic analysis of the system. A total of 77 RC specimens were tested with and without FRP strengthening.; Given that bond between FRP and concrete is the critical link, in the shear strengthening program, different techniques were used to enhance the bond between concrete and Sprayed GFRP. It was found that roughening the concrete surface using a pneumatic chisel and using mechanical fasteners were the most effective techniques. Also, Sprayed GFRP applied on 3 sides (U-shaped) was more effective than 2-sided Sprayed GFRP in shear strengthening under both static and impact loading. GFRP, both sprayed and fabric, increased the shear load carrying capacity of RC beams and their energy absorption capacities, but Sprayed GFRP, especially U-shaped, was more effective than fabric GFRP. An increase of up to 105% in load carrying capacity of strengthened RC beams was observed under impact loading with respect to unstrengthened RC beams.; Simple equations were proposed to calculate the contribution of Sprayed GFRP in shear capacity of RC beams under quasi-static and impact loadings. Analysis of data indicated that the load carrying capacity of strengthened RC beams both under quasi static and impact conditions was governed by the effective strain capacity of the Sprayed GFRP, which was, in turn, governed by the GFRP configuration and its bond with concrete. Future research should therefore focus on enhancing the strain capacity of the FRP when used as externally bonded reinforcement for structural strengthening.
机译：钢筋混凝土（RC）梁的剪切破坏常常是突然的，并且是灾难性的。因此，考虑到维护公共安全，及时加固不足的RC梁是至关重要的。本文研究了外结合喷涂玻璃纤维增​​强聚合物（喷涂GFRP）在准静态和冲击载荷下对RC梁的抗剪加固的有效性。与手工涂抹的，现场浸渍的FRP织物进行直接比较。为了研究冲击载荷下的RC梁，开发了一种独特的测试装置。在此设置中，将同时敲击锤子和样品支架，并在样品上安装加速度计，以准确测量样品的惯性载荷并提供对系统的正确动态分析。在有或没有FRP加强的情况下，总共测试了RC标本77个。鉴于FRP和混凝土之间的粘结是关键环节，在抗剪加固程序中，采用了不同的技术来增强混凝土与喷涂GFRP之间的粘结。发现使用气动凿子和使用机械紧固件使混凝土表面粗糙是最有效的技术。同样，在静态和冲击载荷下，在三面（U形）上喷涂的GFRP比两面喷涂的GFRP更有效。 GFRP，无论是喷涂的还是织物的，都增加了RC梁的剪切承载能力和能量吸收能力，但是喷涂的GFRP（尤其是U形）比织物的GFRP更有效。相对于未加筋的RC梁，在冲击荷载作用下，加筋的RC梁的承载能力提高了105％。提出了简单的方程式来计算在拟静力和冲击载荷作用下，喷射GFRP对RC梁抗剪承载力的贡献。数据分析表明，在拟静力和冲击条件下，钢筋混凝土梁的承载能力受喷射型GFRP的有效应变能力支配，而有效应变能力又由GFRP构型及其与混凝土的粘结力支配。因此，将来的研究应集中在增强FRP用作结构增强的外部粘结增强材料时的应变能力。

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  • 作者

    Soleimani, Sayed Mohamad.;

  • 作者单位

    The University of British Columbia (Canada).;

  • 授予单位 The University of British Columbia (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 230 p.
  • 总页数 230
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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