无腹筋RUHTCC梁抗剪性能试验研究
发布时间：2018-09-09 09:18
【摘要】：为了探究超高韧性水泥基复合材料(UHTCC)的抗剪性能,以配筋率和剪跨比为参数,对跨中荷载作用下的6根钢筋增强UHTCC(RUHTCC)梁和4根钢筋混凝土(RC)对比梁进行了受弯试验.对比研究了RUHTCC梁的抗剪性能,包括裂缝扩展形态、荷载-挠度曲线、剪切开裂荷载、极限剪切能力以及剪切强度等.试验结果表明,随着配筋率的增大和剪跨比的减小,RUHTCC梁的破坏模式由弯剪破坏转变为剪压破坏,极限剪切承载能力逐渐增大.RUHTCC梁的极限剪切能力约为RC梁的2倍,平均抗剪强度约为UHTCC抗拉强度的0.86倍;RUHTCC梁表现出稳态的多条细密斜裂缝扩展模式,在正常使用极限状态下,其最大裂缝宽度低于0.1 mm.基于RUHTCC梁良好的裂缝控制能力以及较高的富余剪切承载能力,不需设置最小配箍率.
[Abstract]:In order to investigate the shear resistance of ultra-high toughness cement matrix composite (UHTCC), the flexural tests of 6 reinforced UHTCC (RUHTCC) beams and 4 reinforced concrete (RC) beams under mid-span load were carried out with the ratio of reinforcement and shear span ratio as parameters. The shear behavior of RUHTCC beams is compared and studied, including crack propagation, load-deflection curve, shear cracking load, ultimate shear capacity and shear strength. The experimental results show that with the increase of reinforcement ratio and the decrease of shear span ratio, the failure mode of RUHTCC beam changes from flexural shear failure to shear-compression failure, and the ultimate shear bearing capacity of RUHTCC beam increases gradually. The ultimate shear capacity of RUHTCC beam is about twice as high as that of RC beam. The average shear strength is about 0.86 times that of UHTCC tensile strength. RUHTCC beam shows steady state multiple fine inclined crack propagation mode, and its maximum crack width is less than 0.1 mm. under the normal service limit state. Based on the good crack control ability of RUHTCC beam and the higher load capacity of surplus shear, the minimum hoop ratio is not required.
【作者单位】： 河海大学海岸灾害与防护教育部重点实验室;浙江大学建筑工程学院;大连理工大学建设工程学部;
【基金】：水利部公益性行业科研专项资助项目(201301052) 中央高校基本科研业务费资助项目(2013B03614) 浙江省重点科技创新团队资助项目(2010R50034)
【分类号】：TU375.1
[Abstract]:In order to investigate the shear resistance of ultra-high toughness cement matrix composite (UHTCC), the flexural tests of 6 reinforced UHTCC (RUHTCC) beams and 4 reinforced concrete (RC) beams under mid-span load were carried out with the ratio of reinforcement and shear span ratio as parameters. The shear behavior of RUHTCC beams is compared and studied, including crack propagation, load-deflection curve, shear cracking load, ultimate shear capacity and shear strength. The experimental results show that with the increase of reinforcement ratio and the decrease of shear span ratio, the failure mode of RUHTCC beam changes from flexural shear failure to shear-compression failure, and the ultimate shear bearing capacity of RUHTCC beam increases gradually. The ultimate shear capacity of RUHTCC beam is about twice as high as that of RC beam. The average shear strength is about 0.86 times that of UHTCC tensile strength. RUHTCC beam shows steady state multiple fine inclined crack propagation mode, and its maximum crack width is less than 0.1 mm. under the normal service limit state. Based on the good crack control ability of RUHTCC beam and the higher load capacity of surplus shear, the minimum hoop ratio is not required.
【作者单位】： 河海大学海岸灾害与防护教育部重点实验室;浙江大学建筑工程学院;大连理工大学建设工程学部;
【基金】：水利部公益性行业科研专项资助项目(201301052) 中央高校基本科研业务费资助项目(2013B03614) 浙江省重点科技创新团队资助项目(2010R50034)
【分类号】：TU375.1
【参考文献】
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