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Constitutive behaviour of lateral ties confined polyolefin fibre reinforced concrete under monotonic axial compression

机译：单调轴压下横向关系的组成型行为约束聚烯烃纤维增强混凝土

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In this investigation, the combined effect of spacing of lateral ties and volume fraction of polyolefin fibres was studied both experimentally and analytically from the point of deformability characteristics of concrete. Low modulus synthetic fibers such as polyolefin based fibers, it is shown that polyolefin fibers with sufficient tensile strength can successfully enhance the mechanical properties of concrete. The mechanism of delaying and arresting the progressive internal cracking from transition zone to the matrix by the fibres can be made use in passive confinement of concrete. Such concrete was termed as polyolefin fiber reinforced concrete (PFRC). In this study the confinement effectiveness of polyolefin fibres of volume fractions 0.3%, 0.5%, 0.7%, 0.9% and 1.2% in addition to lateral ties of spacing 290 mm, 145 mm and 75 mm on concrete prisms of size 150×150×300 mm were investigated. Such concrete is termed as confined polyolefin fiber reinforced concrete (CPFRC).This paper presents an analytical model (profile) for predicting the constitutive behaviour of CPFRC based on the experimental and analytical results. A total of seventy two prisms of size 150×150×300 mm were cast and tested under strain control rate of loading. The increase in strength and strain of CPFRC were used in formulating the constitutive relation. The results of the testing demonstrate the behavioral differences between plain and CPFRC and the ability of the synthetic macro fiber to be used as secondary reinforcement in seismic resistance applications.
机译：在该研究中，从混凝土的可变形性特征进行了实验和分析，研究了聚烯烃纤维的横向关系和体积分数的组合效果。低模量合成纤维如聚烯烃基纤维，示出了具有足够拉伸强度的聚烯烃纤维可以成功增强混凝土的机械性能。通过纤维从过渡区延迟和延迟渐进内部裂缝的机制可以用于混凝土的被动限制。这种混凝土称为聚烯烃纤维增强混凝土（PCRC）。在这研究中，体积分数的聚烯烃纤维的限制效果0.3％，0.5％，0.7％，0.9％和1.2％，除了290 mm，145 mm和75 mm的横向关系，大小为150×150×的混凝土棱镜研究了300毫米。这种混凝土称为密闭的聚烯烃纤维增强混凝土（CPFRC）。本文提出了一种分析模型（型材），用于基于实验和分析结果预测CPFRC的组成型行为。在应变控制速率下，施放和测试总共72°尺寸为150×150×300mm。 CPFRC的强度和菌株的增加用于制定本构关系。测试结果证明了平面和CPFRC之间的行为差​​异以及合成宏观纤维在地震抗性应用中用作二次增强的能力。

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