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在13根钢纤维高强混凝土梁等幅疲劳试验基础上,探讨了等效应力比、钢纤维类型、钢纤维体积率、钢纤维掺入范围和混凝土强度对钢纤维高强混凝土梁挠度和刚度的影响,建立了基于有效惯性矩的钢纤维高强混凝土梁刚度计算模型及公式。结果表明:在高强混凝土梁中掺入钢纤维提高了梁的截面刚度,使疲劳荷载作用下高强混凝土梁跨中挠度减小15%~61%;基于有效惯性矩的钢纤维高强混凝土梁挠度和刚度计算结果与试验结果吻合较好。
The effects of equivalent stress ratio, steel fiber type, steel fiber volume fraction, steel fiber incorporation range and concrete strength on the deflection and stiffness of steel fiber reinforced high-strength concrete beams were discussed based on the same fatigue test of 13 steel fiber reinforced high-strength concrete beams. , The stiffness calculation model and formula of steel fiber reinforced high strength concrete beam based on effective moment of inertia are established. The results show that steel fiber reinforced high-strength concrete beam increases the section rigidity of the beam, and the mid-span deflection of high-strength concrete beam decreases by 15% -61% under the fatigue load. The deflection of steel fiber reinforced high-strength concrete beam based on effective moment of inertia Stiffness calculation results agree well with the experimental results.