韧性对钢纤维自密实混凝土梁受剪性能的影响

Influence of Toughness on Shear Behavior of Steel Fiber Reinforced Self consolidating Concrete Beams

关键词:  梁  钢纤维  自密实混凝土  弯曲韧性  破坏形态  受剪承载力

Key words:  beam  steel fiber  self consolidating concrete  flexural toughness  fail mode  shear capacity

摘要:

为研究弯曲韧性对不同配箍率钢纤维自密实混凝土梁受剪性能的影响，分别对24个弯曲韧性试件与16根钢纤维自密实混凝土梁式构件进行了弯曲试验.根据荷载位移曲线以及韧性参数，分析了弯曲韧性对梁式构件受剪破坏形态和承载力的影响.结果表明：加入钢纤维可以提高自密实混凝土梁的受剪承载力，同时还可以改善梁的破坏形态；建立了基于弯曲韧性的受剪承载力计算模型，该模型预测值与试验结果较为接近，可用于钢纤维自密实混凝土梁的受剪计算.

Abstract:

In order to investigate the influence of flexural toughness on the shear behavior of steel fiber reinforced self consolidating concrete(SFRSCC) beams, 24 flexural test beams and 16 SFRSCC beams were experimentally studied. Based on the load deflection curves and toughness index, the influence of flexural toughness on the fail mode and shear capacity was clarified. The results indicate that the shear capacity increases clearly with increasing fiber content. An analysis model for the prediction of shear capacity of SFRSCC beams is proposed. The predictions of the model are compared with experimental results, and the proposed model fits very well with the test results. So it is suitable for shear analysis and design of SFRSCC beams.