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通过对6根配有HRB500级低成本高性能钢筋钢纤维混凝土梁和2根未掺钢纤维的钢筋混凝土梁的试验研究,分析不同钢纤维掺量情况下梁的破坏形态和承载力特点,根据实测数据研究现行规程的开裂弯矩、承载力和裂缝宽度计算方法,对HRB500级低成本高性能钢筋钢纤维混凝土梁的适用性。研究表明:与未掺钢纤维的钢筋混凝土梁相比,HRB500级低成本高性能钢筋钢纤维混凝土梁的开裂弯矩、承载力均有提高,裂缝宽度减小;承载力和裂缝宽度计算值与实测值吻合较好,可沿用CECS 38∶92《钢纤维混凝土结构设计与施工规程》,开裂荷载计算值大于实测值,给出了修正方法。
Based on the experimental research of six low-cost high-performance steel reinforced concrete beams with HRB500 and two reinforced concrete beams without steel fibers, the failure morphology and bearing capacity characteristics of beams under different steel fiber contents were analyzed. According to Measured data to study the current rules of cracking moment, bearing capacity and crack width calculation method, the HRB500 low cost high performance steel fiber reinforced concrete beam applicability. The results show that the bending moment and the bearing capacity of HRB500 low-cost and high-performance steel fiber reinforced concrete beams increase and the width of cracks decrease compared with those of non-steel fiber reinforced concrete beams. The calculated values of bearing capacity and crack width are The measured values agree well with each other. CECS 38:92 “Code for design and construction of steel fiber reinforced concrete structures” can be used. The calculated cracking load is larger than the measured value, and the correction method is given.