Shear resistance of concrete reinforced with ultra-high strength steel fibres

Ciência & Tecnologia dos Materiais Pub Date : 2017-01-01 DOI:10.1016/j.ctmat.2016.04.004

José Gomes , Carlos Sousa , Mário Pimentel , Ana Maria Proença , A. Serra Neves

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引用次数: 2

Abstract

In order to evaluate the performance of high strength concrete reinforced with Dramix 5D 65/60 BG fibres, with non-deformable hook and ultra-high tensile strength, 24 beams were subjected to shear, with different fibre content (0, 15, 30 and 50 kg/m³), with and without stirrups in the shear span. In a second test campaign, 18 of those beams were tested again in the opposite end, with a variable shear span/effective depth (a/d) ratio in order to evaluate the influence of this parameter in the shear crack pattern and shear resistance. A probabilistic approach was followed to derive the corresponding design value of the shear strength (a procedure herein named by Design Assisted by Testing, DAT), which was then compared with the design shear strength determined according to recommendations of RILEM, EHE and FIB. Test results of both campaigns showed a significant increase in shear strength in relation to beams without fibres. Besides that, the design values of the shear strength derived from test results (DAT) were considerably higher than the design shear resistance provided by design codes.

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超高强度钢纤维增强混凝土的抗剪性能

为了评估用Dramix 5D 65/60 BG纤维增强的高强混凝土的性能，具有不可变形的钩和超高的抗拉强度，24根梁受到不同纤维含量(0,15,30和50 kg/m3)的剪切，在剪切跨度中有和没有箍筋。在第二次试验中，其中18根梁在另一端再次进行了试验，采用可变剪切跨度/有效深度(a/d)比，以评估该参数对剪切裂缝模式和抗剪抗力的影响。采用概率法推导相应的抗剪强度设计值(本文称之为design Assisted by Testing, DAT)，并将其与根据RILEM、EHE和FIB建议确定的设计抗剪强度进行比较。两种运动的测试结果都表明，与不含纤维的梁相比，抗剪强度显著增加。此外，试验结果得出的抗剪强度设计值(DAT)明显高于设计规范规定的设计抗剪强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Ciência & Tecnologia dos Materiais

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