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Performance of hybrid carbon and basalt FRP sheets in strengthening concrete beams in flexure

机译：碳纤维与玄武岩混合FRP板在弯曲混凝土梁中的性能

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摘要

This study presents the bending performance of reinforced concrete (RC) beams strengthened with hybrid carbon and basalt fiber reinforced polymer (CFRP/BFRP) composite sheets. The proposed hybrid system is intended to improve the properties of the strengthening composite material, in which high strength CFRP sheets are combined with ductile BFRP sheets via epoxy adhesive. A total of 10 beams were tested, nine of which were strengthened with different combinations of CFRP and BFRP sheets, and the remaining beam was unstrengthened to serve as a control specimen. The test results indicated clear improvements in the load-carrying capacity and ductility of the strengthened specimens. The range of increase in the ultimate capacity of the hybrid-strengthened beams over that of the control beam specimen was between 66 and 75%. In addition, the deflection ductility indices of the hybrid beams presented an improvement up to 108% compared to those strengthened with CFRP laminates only. Finite element (FE) models were also developed to predict the response and load-carrying capacity of the tested specimens. The models precisely predicted the experimentally obtained load-carrying capacity and associated mid-span deflections at yield and ultimate loads, with a deviation that did not exceed 12%.
机译：这项研究提出了混合碳和玄武岩纤维增强聚合物（CFRP / BFRP）复合板增强的钢筋混凝土（RC）梁的弯曲性能。拟议的混合体系旨在改善增强复合材料的性能，在该复合材料中，高强度CFRP片材与可延展的BFRP片材通过环氧树脂粘合剂结合在一起。总共测试了10条梁，其中9条通过CFRP和BFRP板的不同组合进行了加固，剩下的梁未加强度作为对照样品。测试结果表明，增强后的试样的承载能力和延展性明显改善。混合加强梁的极限承载力相对于控制梁试样的极限承载力提高幅度在66％至75％之间。此外，与仅使用CFRP层压板增强的梁相比，混合梁的挠曲延性指数提高了108％。还开发了有限元（FE）模型来预测被测样品的响应和承载能力。这些模型精确地预测了在屈服和极限载荷下实验获得的承载能力和相关的中跨挠度，偏差不超过12％。

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