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首页> 外文期刊>Magazine of Concrete Research >Shear behaviour of lightweight concrete beams strengthened with CFRP composite
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Shear behaviour of lightweight concrete beams strengthened with CFRP composite

机译：CFRP复合材料加固轻型混凝土梁的抗剪性能

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摘要

This paper presents the experimental results obtained from lightweight concrete (LWC) and normal-weight concrete (NWC) beams with closed and U-shaped configurations of epoxy-bonded carbon fibre-reinforced polymer (CFRP) reinforcement in order to compare the shear-resisting mechanisms between LWC and NWC beams. The experimental results show that the CFRP can successfully be applied in the strengthening of LWC beams, and that the shear strength gained due to CFRP reinforcement for lightweight samples is less than the NWC samples while the modes of failures are the same. In contrast, diagonal shear cracks propagate through the lightweight aggregate compared to cracks around normal aggregate in the concrete matrix. Furthermore, the numerical study shows that the design guidelines to estimate the CFRP contribution, which do not differentiate between concrete types, overestimate the effect of U-shaped CFRP reinforcement on LWC beams where the effective bond length of CFRP could not be achieved due to lower tensile strength of LWC.
机译：本文介绍了从轻质混凝土（LWC）和标准重量混凝土（NWC）梁获得的实验结果，这些梁具有封闭和U型构型的环氧粘结碳纤维增强聚合物（CFRP）增强材料，以比较抗剪强度LWC和NWC梁之间的机制。实验结果表明，CFRP可以成功地应用于轻质混凝土梁的加固，而CFRP加固对轻质样品的抗剪强度小于NWC样品，而破坏模式相同。相反，与混凝土基体中正常骨料周围的裂缝相比，斜向剪切裂缝通过轻骨料传播。此外，数值研究表明，估算CFRP贡献的设计准则（未区分混凝土类型）高估了U形CFRP加固对LWC梁的影响，而LWC梁由于较低而无法获得有效的粘结长度LWC的抗拉强度。

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