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目的:揭示不同剪跨比和配箍率的钢筋增强超高韧性水泥基复合材料(RUHTCC)梁的抗剪性能,为超高韧性水泥基复合材料(UHTCC)用于结构关键抗剪部位提供参考。方法:基于抗剪试验结果,阐明剪跨比和配箍率对RUHTCC梁抗剪性能的影响,明确UHTCC与箍筋之间的复合抗剪效应,揭示RUHTCC梁的抗剪机理。方法:以剪跨比和配箍率为变量参数,通过RUHTCC梁在跨中集中荷载作用下的弯曲试验,研究RUHTCC梁的剪切裂缝形态、荷载-挠度行为、破坏模式、开裂剪切强度和极限剪切强度等抗剪性能,并结合试验结果,分析RUHTCC梁的剪力传递机理。结论:1.RUHTCC梁呈现出优良的剪切抗力以及稳态的斜裂缝扩展过程和多缝剪切开裂行为。2.配置少量的箍筋可将典型的剪切破坏转变为较为延性的弯剪破坏甚至弯曲破坏。然而,箍筋的配置并未显著提高RUHTCC梁的抗剪能力,同时耦合UHTCC与箍筋也没有表现出协同抗剪效应。3.拉杆-拱模型和桁架-拱模型可用以描述RUHTCC短梁和细长梁的抗剪机理。
OBJECTIVE: To reveal the shear properties of reinforced UHH steel reinforced ultra-high toughness (UHTHC) beams with different shear span ratios and stirrup ratios, and to provide reference for the application of UHTCC in key shear-resistant structures . Methods: Based on the results of shear tests, the effects of shear span ratio and stirrup ratio on the shear properties of RUHTCC beams were clarified. The shear-resistant effect between UHTCC and stirrups was clarified, and the shearing mechanism of RUHTCC beams was revealed. Methods: With the ratio of shear span ratio and stirrup ratio as parameters, the shear fracture morphology, load-deflection behavior, failure mode, cracking shear strength and shear strength of RUHTCC beam were studied by the bending test of RUHTCC beam under the mid-span concentrated load Ultimate shear strength and other shear properties, combined with the test results, analyze the shear force transmission mechanism RUHTCC beam. Conclusion: 1.RUHTCC beams exhibit excellent shear resistance and steady-state oblique crack propagation and multi-slit shear cracking behavior. 2. The configuration of a small amount of stirrup can transform the typical shear failure into more ductile bending shear failure or even bending damage. However, the configuration of the stirrups did not significantly improve the shear capacity of the RUHTCC beams, nor did the coupling of the UHTCC and the stirrups exhibit a synergistic shear effect. 3. Tie rod-arch model and truss-arch model can be used to describe the shear mechanism of RUHTCC short and slender beams.