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纤维混凝土梁受弯或受剪时纤维的选取对纤维发挥抗弯或抗剪作用尤其重要。进行了15组混杂纤维自密实混凝土梁的弯曲韧性试验和13根纤维增强钢筋自密实混凝土梁的抗剪性能试验研究,将梁的抗弯、抗剪性能与相同条件的以往研究结果进行对比。结果表明,单掺钢纤维时,长度50mm、长径比80的钢纤维混凝土梁弯曲韧性好于长度35mm、长径比64的钢纤维混凝土梁,对梁的抗剪贡献大;混杂长度50mm、长径比80的钢纤维混凝土梁与长度45mm、长径比60的合成纤维混凝土梁的剩余抗弯强度fR,4高于混杂长度50mm、长径比80的钢纤维混凝土梁与长度30mm、长径比45的合成纤维混凝土梁,对梁的抗剪贡献大;钢纤维和合成纤维类型一定时,在混凝土梁中掺加掺量为(40+4)kg/m~3的混杂纤维在提高梁的抗弯性能和抗剪性能方面好于掺加掺量为(30+5)kg/m~3的混杂纤维,掺加掺量为(30+5)kg/m~3的混杂纤维好于掺加掺量为(20+6)kg/m~3的混杂纤维。
Fiber reinforced concrete beam bending or shearing of the fiber selection of the role of the fiber to play a bending or shear is particularly important. The flexural toughness test of 15 hybrid fiber self-compacting concrete beams and the shear resistance of 13 self-compacting reinforced concrete beams were carried out. The bending and shear resistance of the beams were compared with the previous research results under the same conditions. The results show that the flexural toughness of steel fiber reinforced concrete beam with length of 50mm and aspect ratio of 80 is better than that of steel fiber reinforced concrete beam with length of 35mm and aspect ratio of 64, The residual flexural strength (fR, 4) of steel fiber reinforced concrete beams with length - diameter ratio 80 and 45 mm in length and 60 in aspect ratio is higher than that of steel fiber reinforced concrete beams with length of 30 mm and length - length ratio of 50 mm The synthetic fiber reinforced concrete beam with a diameter ratio of 45 contributes greatly to the shearing resistance of the beam. When the types of steel fiber and synthetic fiber are certain, the hybrid fiber with the blending ratio of (40 + 4) kg / m ~ 3 is increased The flexural and shear properties of the beam are better than that of the mixed fiber with (30 + 5) kg / m ~ 3 and the mixed fiber with (30 + 5) kg / m ~ In the mixed content of (20 +6) kg / m ~ 3 hybrid fibers.