钢筋超高性能混凝土梁抗剪性能试验研究
Experimental study on shear behavior of reinforced ultra-high performance concrete beams

对11根钢筋超高性能混凝土梁在两点对称加载作用下进行抗剪性能试验，试验参数为钢纤维掺量、剪跨比、纵筋配筋率、配箍率等. 试验结果表明，4个参数中钢纤维掺量对梁的抗剪承载力影响最大，其次为剪跨比和纵筋率，配箍率影响最小；钢纤维掺量的增加显著提高了梁的抗剪承载力与抗变形能力，影响梁的破坏形态. 根据试验结果与收集到的UHPC梁受剪资料，对基于桁架-拱理论的UHPC梁抗剪计算公式进行了修正.
In order to study the shear behavior of ultra- high performance concrete (UHPC ) beams，the shear tests of 11 UHPC specimens under two concentrated loads are carried out. The test parameters are steel fiber content，shear span ratio，longitudinal reinforcement ratio and stirrup ratio. The test results show that the fiber content has the largest influence on the shear capacity among the four parameters，followed by the shear span ratio and longitudinal reinforcement ratio，while the minimum one is the stirrup ratio. The increase of steel fiber content significantly improves the bearing capacity and influence on failure modes of the shear beam. According to the test results and the collected UHPC beam shear data，the shear strength prediction formula based on truss-arch theory is improved