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标题：Experimental Investigation on the Behaviour of Concrete Beams with Minimum Stirrups and Steel Fibre under Static and Impact Loading
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作者：A. Mahalakshmi ; K. Mohamed Rameez Raja
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2018
卷号：7
期号：5
页码：6064-6075
DOI：10.15680/IJIRSET.2018.0705187
出版社：S&S Publications
摘要：This study investigated the effects of steel fibers and stirrups on structural behaviour of RC beams under static, and impact loading conditions, were adopted, and five different volume fractions (vf) of hook end steel fibers, i.e., 0, 0.5,1,1.5 and 2% were considered. The addition of steel fibers results in ductile behaviour, increased shear and energy absorption capacities, and enhanced impact resistances of RC beams in terms of reduced maximum and residual displacements.In general, higher enhancement of structural performance of RC beams were obtained when higher amount of steel fibers was incorporated. The use of stirrups was effective in increasing the shear capacity of the RC beams under static, impact loads.On the other hand, the addition of 1 vol % fibres, which is typically sufficient for replacing the minimum shear reinforcement, was not adequate to prevent shear failure for any of the three loading rates in this study.To investigate the effect of the reinforcement ratio on the flexural behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC) beams under static, impact loading, a total of four large-sized(1200x150x200 mm) beams were tested using a static and drop-weight impact test machine The addition more than one fibre in concrete is known as Hybrid Fibre Reinforced Concrete. this experimental work it is been concluded that Maximum percentage of steel fibre can be used in concrete as reinforcing material is 1% for positive results. Problem that we faced during this research work is mixing of Steel fibre in concrete. The combined using of stirrups and fibers demonstrates great positive hybrid effect on the load-bearing capacity of beam subjected to bending and shear, such as post-peak behavior and failure pattern.The concrete mix design is done for M20and M25 grade of concrete with water cement ratio 0.5. The steel fiber reinforced concrete containing fibers of 0.5%, 1.0%, 1.5% and 2% volume fraction of hooked end steel fibers of 60 aspect ratio were used. The cube size is 150mm x150mm x150 mm for testing the compressive strength of concrete. Flexural strength is checked by testing beams of size 1200 mm x 150 mm x 200 mm beneath two points loading. From experiment, it was concluded that the most optimum fiber content that gives maximum compressive strength and flexural strength was 1% respectively. Steel fibers reinforced concrete (SFRC) construction is more economical than conventional construction. In addition to cost reduction, SFRC has other beneficial properties such as higher stiffness, higher ductility, lightweight, low repair costs, and better post-cracking and dynamic behaviour.
关键词：Steel fiber; reinforcement; compressive strength; flexural strength; stirrup;