低周反复荷载下钢筋钢纤维混凝土连梁的斜截面承载力

Diagonal sectional bearing capacity of steel fiber concrete coupling beams under low frequency cyclic load

通过低周反复荷载下5个钢筋钢纤维混凝土连梁和1个普通钢筋混凝土连梁的抗剪性能试验,研究了钢纤维对钢筋混凝土连梁裂缝和破坏形态的影响,探讨了钢筋钢纤维混凝土连梁的斜截面承载力随钢纤维掺量的变化规律,结合普通钢筋混凝土连梁斜截面承载力的计算方法,提出了钢筋钢纤维混凝土连梁斜截面承载力的计算公式,比较结果表明,计算值和试验值吻合较好。

The experiment was carried out on the shear performance of 5 steel fiber reinforced concrete coupling beams and 1 common reinforced concrete coupling beam under low cyclic load. The effects of steel fibers on the cracks and failure modes of reinforced concrete coupling beams were studied. The changing laws of diagonal section bearing capacity of steel fiber reinforced concrete coupling beams with mixed fiber content were analyzed. Based on the calculating method for the diagonal section bearing capacity of common reinforced concrete coupling beam, the calculating method for the diagonal section bearing capacity of reinforced concrete coupling beam with steel fibers was put forward. Comparative results show that the calculated values agree well with test ones.