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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >An Investigation on Shear Behavior of Prestressed Concrete Beams Cast by Fiber Reinforced Concrete
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An Investigation on Shear Behavior of Prestressed Concrete Beams Cast by Fiber Reinforced Concrete

机译：纤维混凝土浇筑预应力混凝土梁的受剪性能研究

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摘要

Failure due to shear is brittle in nature, and inherent lesser concrete tensile strength is a main contributing factor. During loading before the shear reinforcement could start functioning, cracking in concrete starts. Use of fibers in concrete had proven improved impact on tensile strength of concrete. Active reinforcement role initiates after concrete cracking starts. This paper investigates into the shear behavior of fiber reinforced, pretensioned concrete I-section beam specimens. A total of six beam specimens were cast. Two types of fibers, steel fibers and polypropylene fibers were used in five different proportions. For comparison, one control specimen was also cast without inclusions of fibers in concrete. Concrete mix ratio, prestress force, shear span-to-depth ratio and shear and flexural reinforcement details were kept constant in all specimens. Specimens were subjected to four-point loading to ensure that all specimens fail due to excessive shear force. During tests, deflections and strains were also measured. It was concluded that shear strength of beams was improved using steel fiber reinforced concrete (SFRC) as compared to polypropylene fiber reinforced concrete (PPFRC). SFRC beam containing 0.65% fiber depicted 50.71% improvement in ultimate failure load, 67% improvement in first cracking load and 36% improvement in ultimate deflection as compared to control beam.
机译：由于剪切而导致的破坏本质上是脆性的，并且固有的较小的混凝土抗拉强度是主要的影响因素。在加载过程中，在抗剪钢筋开始起作用之前，混凝土开始出现裂缝。已证明在混凝土中使用纤维对混凝土的抗张强度具有改善的影响。混凝土开裂开始后，便开始发挥积极的加固作用。本文研究了纤维增强预应力混凝土I型截面梁的抗剪性能。总共铸造了六个梁样品。以五种不同的比例使用了两种类型的纤维，钢纤维和聚丙烯纤维。为了进行比较，还浇铸了一个对照样品，混凝土中没有纤维夹杂物。在所有试样中，混凝土的配合比，预应力，剪切跨度-深度比以及剪切和抗弯钢筋的细节均保持不变。样品承受四点载荷，以确保所有样品均由于过大的剪切力而失效。在测试过程中，还测量了挠度和应变。结论是，与聚丙烯纤维增强混凝土（PPFRC）相比，钢纤维增强混凝土（SFRC）提高了梁的抗剪强度。与控制梁相比，包含0.65％纤维的SFRC梁的极限破坏载荷提高了50.71％，首次破裂载荷提高了67％，极限挠度提高了36％。

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