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首页> 外文期刊>International Journal of Sustainable Materials and Structural Systems >Influence of fibres on the rebar-concrete bond: further evidence of toughness enhancement
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Influence of fibres on the rebar-concrete bond: further evidence of toughness enhancement

机译：纤维对钢筋混凝土债券的影响：韧性增强的进一步证据

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摘要

The bond between the rebar and the surrounding concrete plays a substantial role in the mechanical performance of a reinforced concrete member due to the stress transfer that occurs at the aforementioned interface. In this study direct rebar pull out tests were performed at different concrete maturities, fibre contents and fibre materials. PET fibres, that have a lower energy requirement during production and improved properties in comparison to polypropylene were used and their performance compared to steel fibres. The addition of fibres leads to a more ductile failure during pull-out. The improved energy absorption capacity is particularly important under seismic loading. Interestingly, a small amount of fibres is enough to notably improve the post-failure behaviour by reducing the softening slope of the stress-slip curve. An increase in fibre content beyond 0.1% for PET fibres does not improve the post-failure behaviour any further. However, steel fibres continue to improve the post-peak behaviour. Thus, the effect of steel fibres is more significant compared to PET fibres and the most pronounced at a high concrete maturity. An analytical model describing the bond stress slip response is proposed and matches the experimental observations well.
机译：由于在上述界面处发生的应力转移，钢筋和周围混凝土之间的粘合在钢筋混凝土构件的机械性能中起着重要作用。在本研究中，直接钢筋撤离测试在不同的混凝土灌浆，纤维含量和纤维材料下进行。使用与钢纤维相比，使用在生产过程中具有较低能量要求和改善的性能的PET纤维，并与钢纤维相比的性能。添加纤维在拉出期间导致更韧性的故障。在地震载荷下，改善的能量吸收能力尤为重要。有趣的是，少量的纤维足以通过减少压力滑动曲线的软化斜率来显着改善失败后行为。对于PET纤维超过0.1％的纤维含量的增加不会进一步改善失败后行为。然而，钢纤维继续提高峰值后行为。因此，与PET纤维相比，钢纤维的效果更为显着，并且在高具体成熟度下最明显。提出了一种描述债券应力滑移响应的分析模型，并匹配实验观察结果。

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