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Shear strengthening of reinforced concrete beams with high strength strain-hardening cementitious composites (HS-SHCC)

机译：高强度应变硬化水泥复合材料剪切强化钢筋混凝土梁（HS-SHCC）

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摘要

Strain-hardening cementitious composite (SHCC) was widely recognized as a material that possesses great potential in the repair and strengthening of reinforced concrete (RC) structures. SHCC can usually achieve high ductility with multiple cracking behavior and it also has excellent durability. Moreover, high tensile strength can also be achieved with proper mix design. In this study, conventional RC beams with shear span-to-depth ratio of 1.5:1 and 2.5:1 were cast first, while high-strength SHCC were then cast as thin patches on lateral surfaces of the RC beams to serve as the strengthening layers. The beams were subject to four-point bending test to obtain their ultimate shear capacities. It was observed from the test results that the ultimate shear capacity of strengthened RC beams increases evidently compared to the reference beams. Upon ultimate shear failure, no spalling of surface concrete occurred as it was restrained by the strengthening layers with the formation of stable multiple fine cracks. A finite element model was constructed to simulate the experimental tests. The results of FEM analysis correlated well with experimental results. A numerical parametric study was then carried out to evaluate the influence of the thickness of HS-SHCC layer and the shear span-to-depth ratio. This study concludes the feasibility of the use of high strength SHCC in shear strengthening of RC structures.
机译：应变硬化水泥复合材料（SHCC）被广泛认识为具有巨大潜力的钢筋混凝土（RC）结构具有巨大潜力的材料。 SHCC通常可以通过多种开裂行为实现高延性，并且它也具有优异的耐用性。此外，还可以通过适当的混合设计实现高拉伸强度。在本研究中，首先铸造剪切跨度与深度比为1.5：1和2.5：1的常规RC光束，而高强度SHCC在RC光束的横向表面上作为薄贴片铸造以用作强化层。梁受到四点弯曲试验，以获得其极限剪切容量。从测试结果观察到，与参考光束相比，强化RC光束的最终剪切容量显然增加。在极限剪切失效时，不会发生表面混凝土的剥落，因为它被强化层抑制了稳定的多个细裂缝的形成。构建有限元模型以模拟实验测试。有限元分析结果与实验结果相比好。然后进行数值参数研究以评估HS-SHCC层厚度和剪切跨度与深度比的影响。本研究结束了高强度SHCC在RC结构的剪切强化中使用的可行性。

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  • 来源
    《Materials and structures》 |2020年第4期|102.1-102.15|共15页
  • 作者

    Jiaying Wei; Chang Wu; Yixin Chen; Christopher K. Y. Leung;

  • 作者单位

    Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR People's Republic of China;

    School of Civil Engineering Southeast University Nanjing 211189 People's Republic of China;

    Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR People's Republic of China;

    Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong SAR People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SHCC; Structural strengthening; Shear-High tensile strength;

    机译：SHCC;结构强化;剪切高抗拉强度;

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