Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets

KANG Juntao; MA Lei; ZHANG Yazhou; QIN Shiqiang; CAO Hongyou

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Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets

更新时间：2023-12-11

- Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 57, Issue 2, Pages: 94-101(2018)
- 作者机构：
  
  1. 武汉理工大学土木工程与建筑学院,湖北,武汉,430070
  2. 
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2018，
  
  Published Online：25 March 2018，
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KANG Juntao, MA Lei, ZHANG Yazhou, et al. Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 57(2):94-101(2018)
DOI：

KANG Juntao, MA Lei, ZHANG Yazhou, et al. Analysis of resisting flexural strength of RC beams strengthened with steel plates and prestressed CFRP Sheets. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 57(2):94-101(2018) DOI：

摘要

为了解决钢筋混凝土梁抗弯承载力降低的问题，提出了一种将钢板锚固于钢筋混凝土梁底部，碳纤维布施加预应力后粘贴于钢板上，实现对梁进行的组合加固的新方法；推导出了组合加固梁在适筋破坏范围内的正截面承载力计算公式。并将计算结果与相关文献的试验数据进行了对比，发现：1）理论计算值与相关文献试验值较为接近，试验中梁的破坏模式与和理论预测的破坏模式基本吻合；2）相对于单一粘贴碳纤维布加固梁，组合加固梁的极限弯矩提高了37.4%~57.1%，屈服弯矩提高了60.4%~95.7%；3）相对于单一粘贴钢板加固梁，组合加固梁的极限弯矩提高了25.4%~39.7%。因此，钢板与预应力碳纤维布组合加固技术可有效提高梁的抗弯性能。

Abstract

In order to solve the problem of the decrease of flexural capacity of reinforced concrete (RC) beams

this paper proposes a new approach of steel plateCFRP composite reinforcement: the steel plates are anchored at the bottom of the reinforced concrete beam

and carbon fiber reinforced polymer (CFRP) sheets are pasted on the steel plates after having been prestressed. The calculation formula for normal section flexural capacity of the composite reinforcement beam in balancedreinforced failure is derived

and the results got by the calculation formula are compared with the test results in relevant literature. The results show that theoretical value is close to test value of relevant literature

the failure modes of beams in the test are consistent with predicted failure modes. Compared with the prestressed CFRP sheet reinforcement

the values of ultimate moment of RC beams strengthened with prestressed CFRP sheets and steel plates increase 37.4%~57.1%

the values of yield moment increase 60.4%~95.7%; Compared with the steel plate reinforcement

the values of ultimate moment increase 25.4%~39.7%. It shows that steel plate-CFRP combination reinforcement technology improves flexural behavior of RC beams effectively.

关键词

桥梁工程预应力碳纤维布钢板组合加固抗弯承载力

Keywords

bridge engineeringprestressed CFRP sheetssteel platescomposite reinforcementresisting flexural strength

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Related Institution

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