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通过进行一系列混杂纤维-钢筋自密实混凝土简支T梁在对称集中荷载作用下的抗剪试验,研究纤维类型及掺量、配箍率等参数对混凝土T梁斜截面受力性能、纵筋应变、箍筋应变和斜裂缝宽度的影响,分析了用混杂纤维部分替代箍筋的可行性,并将T梁与同等条件下矩形梁的极限剪力进行比较。结果表明,混杂纤维的掺入改善了梁的裂缝形态,减小了最大斜裂缝宽度。混杂纤维增加了梁的极限剪力和对应于极限剪力的加载点位移、韧性等。混杂纤维可以限制纵筋应变和箍筋应变的发展。混杂纤维能够部分替代箍筋,增大箍筋间距。混杂纤维能够使T梁从脆性的剪切破坏转变为延性的弯曲破坏。T梁的极限剪力计算时必须考虑翼缘的贡献。
Through a series of shear tests of a series of hybrid fiber-reinforced self-compacting concrete simply supported T-beams under the symmetrical concentrated load, the influences of fiber type and content, stirrup ratio and other parameters on the mechanical behaviors of concrete T-beams, Strain, the strain of stirrup and the width of diagonal crack, the feasibility of replacing the stirrups by hybrid fibers was analyzed. The ultimate shear of T-beams was compared with that of rectangular beams under the same conditions. The results show that the incorporation of hybrid fibers improves the crack shape of the beam and reduces the maximum width of diagonal crack. Hybrid fibers increase the ultimate shear of the beam and the loading point displacement, toughness, etc. corresponding to the ultimate shear force. Hybrid fibers can limit the longitudinal strain and the development of stirrups. Hybrid fiber can partially replace the stirrups, stirrup spacing increased. Hybrid fibers can transform T-beams from brittle shear failure to ductile bending failure. T-beam ultimate shear force calculation must consider the contribution of the flange.