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Prediction model for the flexural strength of steel fiber reinforced concrete beams with fiber-reinforced polymer bars under repeated loading

机译：重复载荷下纤维增强聚合物棒钢纤维钢筋混凝土梁弯曲强度的预测模型

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摘要

This study investigates the flexural performance of steel fiber reinforced concrete (SFRC) beams with fiber reinforced polymer (FRP) bars under repeated loading. Fourteen beams with dimensions of 150 mm x 300 mm x 2100 mm were cast and tested via a four-point bending test. The effects of the FRP reinforcement ratio, type of reinforcement, concrete strength, steel fiber shape, and steel fiber volume fraction on the failure mode, cracking moment, skeleton curve, deflection, strength degradation, and flexural strength of the beams were investigated. The test results revealed two different failure modes for the SFRC beams reinforced with FRP bars, including compression failure and tensile failure. The flexural strength of the beams decreased as the number of load cycles increased under the same deflection. A higher FRP reinforcement ratio, concrete strength, and steel fiber volume fraction enhanced the flexural strength of the beams and decreased the deflection. Finally, the flexural strength test results were compared with several different prediction models. The ACI 440.1R-15, CSA S806-12, and GB 50608-2010 models underestimated the flexural strength of the beams, while the proposed prediction model, which based on the equivalent force block, provided more accurate prediction results.
机译：本研究调查了在重复载荷下用纤维增强聚合物（FRP）棒的钢纤维增强混凝土（SFRC）梁的弯曲性能。铸造具有150mm×300mm×2100mm的尺寸的十四梁，并通过四点弯曲试验进行测试。研究了FRP加固率，加固型，混凝土强度，钢纤维形状和钢纤维体积分数对梁的破坏模式，开裂时刻，骨架曲线，偏转，强度降解和梁的弯曲强度的影响。测试结果显示了使用FRP条加强的SFRC梁的两种不同的故障模式，包括压缩失效和拉伸失效。随着负载循环的数量在相同的偏转下增加，光束的弯曲强度降低。较高的FRP加固率，混凝土强度和钢纤维体积分数增强了梁的弯曲强度并降低了偏转。最后，将弯曲强度测试结果与几种不同的预测模型进行了比较。 ACI 440.1R-15，CSA S806-12和GB 50608-2010模型低估了光束的弯曲强度，而基于等效力块的提出的预测模型提供了更准确的预测结果。

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  • 来源
    《Composite Structures》 |2020年第10期|112609.1-112609.13|共13页
  • 作者

    Zhu Haitang; Li Zongze; Wen Chengcheng; Cheng Shengzhao; Wei Yunxiao;

  • 作者单位

    Henan Univ Engn Sch Civil Engn Zhengzhou 451191 Peoples R China|Zhengzhou Univ Sch Water Conservancy Engn Zhengzhou 450001 Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn Zhengzhou 450001 Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn Zhengzhou 450001 Peoples R China;

    China Construct Seventh Engn Div Corp LTD Zhengzhou 450004 Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn Zhengzhou 450001 Peoples R 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

    Repeated loading; FRP bars; Steel fiber reinforced concrete beams; Flexural strength;

    机译：重复装载;FRP棒;钢纤维钢筋混凝土梁;弯曲强度;

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