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首页> 外文期刊>Magazine of Concrete Research >Structural behaviour of reinforced concrete beams containing crumb rubber and steel fibres
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Structural behaviour of reinforced concrete beams containing crumb rubber and steel fibres

机译：包含碎橡胶和钢纤维的钢筋混凝土梁的结构性能

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摘要

This paper presents experimental work to investigate the strength and cracking characteristics of optimised self-consolidating and vibrated rubberised concrete mixtures with/without steel fibres (SFs) using large-scale reinforced concrete beams. The test beams were cast with varying percentages of crumb rubber (CR) (0 to 35%), SF volume fractions (0, 0.35 and 1%) and SF lengths (35 and 60 mm). The performance of some design codes and published empirical equations was evaluated in predicting the shear capacity and first cracking moment of the tested beams. The results showed that the inclusion of SFs could alleviate the reduction in the shear capacity and first cracking moment that resulted from the addition of CR. In addition, combining CR and SFs contributed to developing sustainable concrete beams with high deformability, reduced self-weight and improved shear capacity. The composite effect of CR and SFs also helped to narrow the developed cracks and change the failure mode from brittle shear failure into ductile flexural failure, particularly for the SF volume of 1% (35 mm length). Comparisons of the predicted and experimental results indicate that most of the proposed equations can satisfactorily estimate the shear strength, but overestimate the first cracking moment.
机译：本文提出了实验工作，以研究使用大型钢筋混凝土梁优化的自固结和振动的含/不含钢纤维（SFs）的优化自固结和振动橡胶化混凝土混合物的强度和开裂特性。用不同百分比的碎胶（CR）（0至35％），SF体积分数（0、0.35和1％）和SF长度（35和60 mm）浇铸测试梁。在预测被测梁的抗剪承载力和首次开裂弯矩时，评估了一些设计规范和已发布的经验公式的性能。结果表明，SFs的加入可以减轻由于添加CR而导致的剪切能力和首次开裂力矩的降低。此外，将CR和SF结合使用有助于开发具有高可变形性，减轻自重和提高剪切能力的可持续混凝土梁。 CR和SF的复合作用还有助于缩小所产生的裂缝，并将破坏模式从脆性剪切破坏转变为韧性弯曲破坏，特别是对于1％的SF体积（35毫米长）而言。预测结果与实验结果的比较表明，大多数提出的方程都可以令人满意地估算抗剪强度，但高估了第一次开裂力矩。

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