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通过对一系列以纤维类型、纤维掺量、配箍率为主要变化参数的混杂纤维自密实混凝土梁斜截面抗剪试验分析,本文研究了在两个对称的集中荷载作用下无箍筋纤维混凝土梁和有箍筋纤维混凝土梁的极限剪力、剪力—加载点位移曲线特性以及破坏形态。结果表明,适量的纤维,尤其是混杂纤维能够显著提高自密实混凝土梁的极限剪力、峰值后承载能力以及韧性,不同纤维共同抗剪时具有明显的正混杂效应。混杂纤维和箍筋的共同作用使按构造配置箍筋的混凝土梁从脆性的剪切破坏转为延性的弯曲破坏。
Through a series of shear tests on the oblique section of hybrid self-compacting concrete beams with fiber type, fiber content and stirrup ratio as the main parameters, this paper studies the shear strength tests of slab-sectioned fiber reinforced concrete beams with two symmetrical concentrated loads Ultimate shear force, shear-loading point displacement curve characteristics and failure modes of beam and hoop-reinforced fiber reinforced concrete beam. The results show that the appropriate amount of fibers, especially hybrid fibers, can significantly increase the ultimate shear strength, peak load carrying capacity and toughness of self-compacting concrete beams, and have obvious positive hybrid effects when different fibers are jointly sheared. The combined action of the hybrid fibers and the stirrups causes the concrete beams of the configuration stirrups to change from brittle shear failure to ductile bending failure.