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首页> 外文期刊>Materials and structures >Experimental investigation of the behaviour of spiral steel fibre reinforced concrete beams subjected to drop-weight impact loads
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Experimental investigation of the behaviour of spiral steel fibre reinforced concrete beams subjected to drop-weight impact loads

机译：螺旋钢纤维混凝土梁在落锤冲击荷载作用下的试验研究

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摘要

Concrete is a brittle material with much lower strength in tension as compared to that in compression. Adding fibres into concrete mix has been intensively investigated to increase the ductility, the crack control and energy absorption capabilities. A new type of steel fibre with spiral shape has been proposed recently. It has been demonstrated by laboratory tests that the spiral-shaped fibres have larger displacement capacity and provide better bonding into the concrete mix compared to other types of fibres such as hooked-end, deformed and corrugated fibres. The present study carries out drop-weight impact tests to study the structural responses of concrete beams reinforced with different types of steel fibres. Plain concrete and concrete reinforced by the commonly used hooked-end steel fibres and the proposed spiral-shaped steel fibres were tested. Two volume fractions, i.e. 0.5 and 1.0 %, of fibres were used to prepare steel fibre reinforced concrete (SFRC) specimens. 100-200 mm cylindrical specimens were also prepared and tested to determine the static properties of the concretes. Centre-point flexural tests were conducted on 100 x 100 x 350 mm beams with span length of 300 mm under drop-weight impact loads. The static tests were carried out using hydraulic testing machine and the impact tests were conducted using an instrumented drop-weight testing system. A 15.2 kg hard steel was used as the drop-weight impactor. Two drop heights, namely 0.5 and 1.0 m, were adopted in performing the repeated impact tests. The high-speed camera, fast-response load cells and laser linear variable differential transformers were used to record the failure processes, forces and displacements of the tested specimens under impact loads. The force-displacement relations and the corresponding energy absorption capabilities of the SFRC beams were obtained, compared and discussed. The advantage and effectiveness of the spiral-shaped steel fibres in increasing the performance of SFRC beam elements under impact loads are examined.
机译：混凝土是一种脆性材料，与压缩相比，其拉伸强度要低得多。已经对添加纤维到混凝土混合物中进行了深入研究，以提高延展性，控制裂纹和吸收能量。最近已经提出了一种新型的螺旋形钢纤维。实验室测试已证明，与其他类型的纤维（如钩形，变形和波纹状纤维）相比，螺旋形纤维具有更大的置换能力，并能更好地粘结到混凝土混合物中。本研究进行了落锤冲击试验，以研究用不同类型的钢纤维增强的混凝土梁的结构响应。测试了普通混凝土和由常用的钩形端部钢纤维和建议的螺旋形钢纤维增强的混凝土。使用两种纤维的体积分数分别为0.5％和1.0％的纤维来制备钢纤维增强混凝土（SFRC）标本。还准备了100-200 mm的圆柱试样并进行了测试，以确定混凝土的静态性能。在跌落冲击载荷下，对跨度为300 mm的100 x 100 x 350 mm梁进行了中心点弯曲测试。静态测试是使用液压测试机进行的，而冲击测试是使用仪器的落锤测试系统进行的。将15.2 kg的硬钢用作落锤。在执行重复冲击测试时，采用了两个跌落高度，分别为0.5和1.0 m。高速摄像机，快速响应的称重传感器和激光线性可变差动变压器用于记录冲击载荷下测试样品的破坏过程，力和位移。获得，比较和讨论了SFRC梁的力-位移关系和相应的能量吸收能力。研究了螺旋形钢纤维在冲击载荷下提高SFRC梁单元性能的优势和有效性。

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  • 来源
    《Materials and structures》 |2016年第2期|353-370|共18页
  • 作者

    Hao Yifei; Hao Hong; Chen Gang;

  • 作者单位

    Curtin Univ, Tianjin Univ & Curtin Univ Joint Res Ctr Struct M, Sch Civil & Mech Engn, Bentley, WA 6102, Australia;

    Curtin Univ, Tianjin Univ & Curtin Univ Joint Res Ctr Struct M, Sch Civil & Mech Engn, Bentley, WA 6102, Australia;

    China Acad Engn Phys, Inst Syst Engn, Mianyang 621900, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Steel fibre reinforced concrete; Spiral fibre; Drop-weight impact;

    机译：钢纤维混凝土;螺旋纤维;减重冲击;

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