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在纤维自密实混凝土工作性试验的基础上,对7组无筋混杂纤维自密实混凝土梁和5组混杂纤维增强低配筋率的钢筋自密实混凝土梁受弯性能进行试验研究,并分析纤维类型和纤维长径比对梁的开裂荷载、屈服荷载、极限荷载以及弯曲韧性的影响。结果表明:梁的弯曲韧性随着纤维长径比的增加而增加,混杂纤维混凝土梁的弯曲韧性优于钢纤维,两种纤维协同作用时具有很好的正混杂效应;与最小配筋率的钢筋混凝土梁相比,纤维的掺入明显地改善了梁的屈服荷载和极限荷载,掺有(40+4)kg/m3混杂纤维并按最小配筋率配筋的梁的极限荷载与仅按1.5倍最小配筋率配筋的梁相当。
Based on the workability test of fiber self-compacting concrete, the flexural properties of 7 groups of self-compacting concrete beams with non-reinforcing fibers and 5 groups of self-compacting reinforced concrete beams with low reinforcement were investigated and the influences of fiber types And fiber aspect ratio on the beam cracking load, yield load, ultimate load and flexural toughness. The results show that the flexural toughness of the beam increases with the increase of the fiber aspect ratio, and the flexural toughness of the hybrid fiber reinforced concrete beam is better than that of the steel fiber. The synergistic effect of the two fibers has a good positive mixing effect and the minimum reinforcement ratio Compared with reinforced concrete beam, the incorporation of fiber obviously improves the yield and ultimate load of beam. The ultimate load of beam with (40 + 4) kg / m3 mixed fiber reinforced with minimum reinforcement ratio is the same as 1.5 times the minimum reinforcement ratio of reinforcement beam quite.