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通过6根高强钢筋活性粉末混凝土简支梁的抗剪试验,得到了不同因素对梁的破坏形态、抗剪承载力及其剪切延性的影响规律。研究表明:剪跨比、配箍率和纵筋率是影响高强钢筋活性粉末混凝土简支梁抗剪性能的主要因素,其中剪跨比影响最大;在适宜的剪跨比条件下,随着纵筋率的提高,无腹筋梁的承载力与斜裂缝倾角增大,剪切延性降低,但有腹筋梁的斜裂缝倾角变化不太明显;提高配箍率不仅可以增强梁的抗剪承载力,而且能够有效改善其剪切延性。
The influence of different factors on the failure mode, shear capacity and shear ductility of beams is obtained through the shear tests of six high strength reinforced reactive powder concrete simply supported beams. The results show that shear span ratio, stirrup ratio and longitudinal reinforcement ratio are the main factors affecting the shear performance of high strength reinforced concrete with simple reinforced concrete beams, of which the shear span ratio is the most important factor. Under suitable shear span ratio conditions, The reinforcement ratio increases, the bearing capacity of non-reinforced web girder and the diagonal crack angle increase, and the shear ductility decreases, but the incline angle change of the diagonal crack with the web girder is less obvious. Increasing the stirrup ratio can not only increase the shear capacity of the beam, But also can effectively improve the ductility of shear.