Zhao Jun, Liang Jingchao, Chu Liusheng, Shen Fuqiang
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China.
Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan.
Materials (Basel). 2018 Sep 11;11(9):1682. doi: 10.3390/ma11091682.
Many researchers have performed experimental and theoretical studies on the shear behavior of steel fiber reinforced concrete (SFRC) beams with conventional reinforcement; few studies involve the shear behavior of SFRC beams with high-strength reinforcement. In this paper, the shear test of eleven beams with high-strength reinforcement was carried out, including eight SFRC beams and three reinforced concrete (RC) beams. The load-deflection curve, concrete strain, stirrup strain, diagonal crack width, failure mode and shear bearing capacity of the beams were investigated. The test results show that steel fiber increases the stiffness, ultimate load and failure deformation of the beams, but the increase effect of steel fiber decreases with the increase of stirrup ratio. After the diagonal crack appears, steel fiber reduces the concrete strains of the diagonal section, stirrup strains and diagonal crack width. In addition, steel fiber reduces crack height and increases crack number. Finally, the experimental values of the shear capacities were compared with the values calculated by CECS38:2004 and ACI544.4R, and the equation of shear capacity in CECS38:2004 was modified to effectively predict the shear capacities of SFRC beams with high-strength reinforcement.
许多研究人员对配有传统配筋的钢纤维增强混凝土（SFRC）梁的抗剪性能进行了试验和理论研究；很少有研究涉及配有高强度配筋的SFRC梁的抗剪性能。本文对11根配有高强度配筋的梁进行了抗剪试验，其中包括8根SFRC梁和3根钢筋混凝土（RC）梁。研究了梁的荷载-挠度曲线、混凝土应变、箍筋应变、斜裂缝宽度、破坏模式和抗剪承载力。试验结果表明，钢纤维提高了梁的刚度、极限荷载和破坏变形，但钢纤维的增强效果随箍筋配箍率的增加而减小。斜裂缝出现后，钢纤维减小了斜截面的混凝土应变、箍筋应变和斜裂缝宽度。此外，钢纤维减小了裂缝高度并增加了裂缝数量。最后，将抗剪承载力的试验值与《CECS38：2004》和《ACI544.4R》计算的值进行了比较，并对《CECS38：2004》中的抗剪承载力公式进行了修正，以有效预测配有高强度配筋的SFRC梁的抗剪承载力。
