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Punching Shear in Steel Fibre Reinforced Concrete Slabs without Traditional Reinforcement

机译:钢纤维钢筋混凝土板的冲压剪切无传统加固

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The punching shear capacity of steel fibre reinforced concrete (SFRC) slabs without traditional steel bar reinforcement was investigated by conducting central point-load tests on twelve square slabs. The test parameters covered fibres with different multi-hook ends, concrete compressive strength, reinforcing index and slab thickness. The statistical performance of two existing models for the prediction of punching shear capacity of SFRC slabs without traditional reinforcement was examined. The load carrying capacity of these slabs were also assessed using the yield line theory. It is noted that the slabs failed primarily in flexure and the yield line theory predicted the load carrying capacities of the slabs most accurately. The reason for a flexural failure in SFRC slabs without steel bars is attributed to the lesser energy required in the propagation of an existing flexural cracks than in the creation of a new circumferential cracks around the column face.
机译:通过在12个方形板上进行中央点载试验,研究了钢纤维增强混凝土(SFRC)板坯的冲压剪切容量。测试参数覆盖具有不同多钩端的纤维,混凝土抗压强度,加强指数和平板厚度。检查了两种现有模型的统计性能,用于预测没有传统增强的SFRC板块的冲压剪切容量。还使用屈服线理论评估这些板坯的负载承载能力。注意,板坯主要在弯曲中失败,屈服线理论最精确地预测了板坯的负载承载能力。没有钢筋的SFRC板坯中弯曲失败的原因归因于现有弯曲裂缝的传播中所需的较小能量,而不是在柱面周围的新圆周裂缝中的产生。

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