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纤维取向和混凝土层间界面对层布式钢纤维混凝土力学性能的影响研究
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TU528;U414

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陕西省交通运输厅项目(21-22k);中央高校基本科研业务费资助项目(300102313114)


Research on Influence of Fiber Orientation and Concrete Interlayer on Mechanical Properties of Layered Steel Fiber-Reinforced Concrete
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    摘要:

    为研究纤维取向和混凝土层间界面对层布式钢纤维混凝土(LSFRC)力学性能的影响,首先进行了0.5%~1.5% 3种纤维掺量的层布式钢纤维混凝土抗压、剪切和弯拉强度实验,接着建立了LSFRC立方体试件和棱柱体试件的精细有限元模型,分析了钢纤维数量、纤维取向和水泥混凝土层间界面结合方式对构件强度和变形能力的影响。实验表明,层布式钢纤维混凝土弯拉强度较素混凝土最大可提高58%。数值分析显示LSFRC棱柱试件层间最大剪应力可降低10.8%,底部跨中挠度可减小17.3%。研究表明,混凝土层间界面结合方式对试件受力有显著影响。钢纤维的掺入会导致试件中产生局部应力集中和整体应力分散两种作用机制,钢纤维抑制了混凝土受拉区的变形,提高了混凝土的抗折能力。

    Abstract:

    For the convenience of analyzing influence of fiber orientation and concrete interlayer on mechanical properties of layered steel fiber-reinforced concrete (LSFRC), firstly, layered steel fiber-reinforced concrete samples with three kinds of fiber content of 0.5%~1.5% are tested for compressive strength, shear strength and flexural tensile strength experiment respectively. And then, fine models of cubic and prismatic LSFRC samples are established by using finite element to analyze effects of fiber content, fiber orientation and the interlayer between concrete layers. The experimental results show that LSFRC exhibit a maximum increment of 58% in flexural strength range. The numerical analysis indicates that the interlayer maximum shear stress is reduced by 10.8% in LSFRC prismatic samples, and the deflection at the bottom of prismatic samples is decreased by 17.3%. The study demonstrates that the bonding states between inter-layers have a significant effect on the loading of specimens. The incorporation of steel fibers is the result of a local stress concentration and an integral stress dispersion in the part of samples, whereas the steel fibers restrain the deformation of zone, improving the bending resistance of concrete.

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陈璇, 冀永安, 欧亚斌, 李猛深, 况栋梁.纤维取向和混凝土层间界面对层布式钢纤维混凝土力学性能的影响研究[J].空军工程大学学报,2024,25(6):119-127

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  • 在线发布日期: 2024-12-06
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