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The influence of fibre orientation on the post-cracking tensile behaviour of steel fibre reinforced self-compacting concrete

机译:纤维取向对钢纤维增强自密实混凝土开裂后拉伸性能的影响

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摘要

Adding fibres to concrete provides several advantages, especially in terms of controlling the crack opening widthand propagation after the cracking onset. However, distribution and orientation of the fibres toward the active crackplane are significantly important in order to maximize its benefits. Therefore, in this study, the effect of the fibredistribution and orientation on the post-cracking tensile behaviour of the steel fibre reinforced self-compactingconcrete (SFRSCC) specimens is investigated. For this purpose, several cores were extracted from distinct locationsof a panel and were subjected to indirect (splitting) and direct tensile tests. The local stress-crack openingrelationship (σ-w) was obtained by modelling the splitting tensile test under the finite element framework and byperforming an Inverse Analysis (IA) procedure. Afterwards the σ-w law obtained from IA is then compared with theone ascertained directly from the uniaxial tensile tests. Finally, the fibre distribution/orientation parameters weredetermined adopting an image analysis technique.
机译:在混凝土中添加纤维具有几个优点,特别是在控制裂纹开度和裂纹开始后的扩展方面。然而,为了使纤维的利益最大化,纤维向活性裂纹面的分布和取向非常重要。因此,在这项研究中,研究了纤维分布和取向对钢纤维增强自密实混凝土(SFRSCC)试样开裂后拉伸行为的影响。为此,从板的不同位置提取了几个芯,并进行了间接(分裂)和直接拉伸测试。通过在有限元框架下对劈裂拉伸试验进行建模并执行逆分析(IA)程序,可以得到局部应力裂纹开度关系(σ-w)。然后,将从IA获得的σ-w定律与直接从单轴拉伸试验确定的σ-w定律进行比较。最后,采用图像分析技术确定纤维分布/取向参数。

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