中文摘要：

通过四点弯曲试验得到钢筋－纤维自密实混凝土梁式构件的荷载－跨中挠度曲线、荷载－纵筋应变曲线和破坏形态，对梁式构件的受弯承载力及纤维与钢筋的混杂效应进行了分析。结果表明：钢纤维的加入使钢筋－纤维自密实混凝土梁式构件的抗弯承载力提高了10％～42％。考虑钢纤维跨越裂缝的传力机理及分布情况提出了钢筋－纤维混凝土梁式构件受弯承载力计算公式，并与ACI 544和CECS 38：2004的公式进行了对比，计算结果表明：文中建议公式计算的受弯承载力与试验结果最为接近，可用于钢筋－纤维自密实混凝土梁式构件的受弯分析与设计。

英文摘要：

Bending tests under four point loading were conducted on steel rebar-reinforced steel fiber-reinforced self-compacting concrete （ SFRSCC ） beams , and the corresponding loading-mid-span deflection curve , longitudinal reinforcement strain-longitudinal reinforcement strain curve and failure mode were obtained .The flexural bearing capacity of the beams and the hybrid effect of steel rebar and macro steel fibers were also examined .It is found that the addition of steel fibers can improve the flexural bearing capacity by 10%~42%.Moreover, by taking into ac-count the steel fiber distribution and its force transfer mechanism crossing the crack , a calculation formula is pro-posed to predict the flexural bearing capacity of the beams , and it is compared with the formulas of ACI 544 and CECS 38：2004.Calculation results show that the proposed formula has a better fit with the test results .Thus, it is suitable for the flexural analysis and design of SFRSCC beams .