The experimental work presented herein is aimed at studying the effect of steel fibres on the behaviour of reinforced concrete (RC) structures designed accordance with Eurocode 2. An attempt has been made to investigate the potential use of steel fibres can result in a significant reduction in conventional shear reinforcement and satisfied the requirement of current codes for strength and ductility. In this respect, hooked end steel fibres with aspect ratio .of 80 were used. Three different dosages of steel fibres in the concrete mix was based on the volume fraction of 0, 1 and 2% (0, 82, 164 kg/m'). In this particular case, additional reduction of the conventional shear reinforcement was carried out by spacing increases (SI) of the stirrups by 50% to see whether the loss of shear strength can be compensated by addition of steel fibre. Concrete compression and flexural tests were conducted for studying the compressive, strength, load-carrying capacity, ductility and energy absorption. In order to determine its mechanical properties, 27 cubes of all sides equal to 100 mm and 6 beams of dimension 200x200x3000mm were casted. All cubes specimens was tested until failure in compression machine and found out that the compressive strength of steel fibre reinforced concrete (SFRC) is not influenced by the steel fibre contribution. However, in the flexural test of beam specimens under monotonic loading; the results indicate steel fibre highly enhanced the flexural strength of SFRC beam. Conclusively, the results revealed that steel fibres give insignificant effect to the compressive strength but highly contribute to strength enhancement of SFRC flexural behaviour. Inclusion of steel fibres allowed for a reduction of conventional shear reinforcement without compromising the ductility and load-carrying capacity. This effect has extended the mode of failure of the beam changed from brittle to a more ductile manner as the amount of steel fibres was increased in the concrete mix.
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机译：本文介绍的实验工作旨在研究钢纤维对按照欧洲规范2设计的钢筋混凝土（RC）结构的性能的影响。已尝试研究钢纤维的潜在用途可显着减少钢纤维的使用。常规的抗剪钢筋，并且满足当前强度和延展性规范的要求。在这方面，使用纵横比为80的钩状端部钢纤维。基于0％，1％和2％（0、82、164 kg / m'）的体积分数，混凝土混合物中三种不同的钢纤维用量。在这种特殊情况下，通过将箍筋的间距增加（SI）增加50％，可以进一步减少传统的剪切增强材料，以查看是否可以通过添加钢纤维来补偿剪切强度的损失。进行了混凝土压缩和弯曲试验，以研究其抗压强度，强度，承载能力，延展性和能量吸收。为了确定其机械性能，铸造了所有面均等于100 mm的27个立方体和6个尺寸为200x200x3000mm的梁。测试所有立方体试样，直到在压缩机中失效为止，发现钢纤维增强混凝土（SFRC）的抗压强度不受钢纤维贡献的影响。但是，在单调加载下的梁试件的弯曲试验中，结果表明，钢纤维大大增强了SFRC梁的抗弯强度。结果表明，钢纤维对压缩强度的影响不明显，但对增强SFRC挠曲行为的强度有很大贡献。包含钢纤维可以减少传统的剪力，而不会影响延展性和承载能力。随着混凝土混合物中钢纤维含量的增加，这种作用将梁的破坏模式从脆性扩展到了更具延性。
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