焦楚杰，  彭春元，杨作用，  张文华 （广州大学土木工程学院，广州510006）

[摘要]  对钢纤维体积率(V_f)为0~3%的钢纤维高强混凝土(SFRHSC)进行抗弯性能测试，试验结果表明，SFRHSC试件整个破坏过程类似于钢筋混凝土适筋梁，且V_f越大，延性破坏特征越明显，荷载-挠度曲线的峰值越大，下降段越平缓。SFRHSC的抗弯强度和韧度均显著高于普通高强混凝土，而且极限抗弯强度与初裂抗弯强度的差值随V_f的提高而增大，但抗弯弹性模量未有明显的变化。
[关键词]  钢纤维高强混凝土；弯曲；荷载-挠度曲线；抗弯强度；韧度；抗弯弹性模量

    Experimental study on flexural performance of steel fiber reinforced high strength concrete
    Jiao Chujie, Peng Chunyuan,  Yang Zuoyong, Zhang Wenhua
    ( School of Civil Engineering, GuangZhou University, GuangZbou 510006 ,China )

Abstract:  Flexural experiments for the steel fiber reinforced high strength concrete (SFRHSC) were conducted, and the volume fraction( V_f) of steel fibers of SFRHSC ranges from 0 t0 3%. The results showed that the whole failure mode of SFRHSC is similar to that of balanced reinforced beam. In additional, the larger the V_f , the more obvious the characteristic of ductile failure mode, and the larger the peak value of flexural load-deflection curves, and the flatter the descending portion of the curves, and the geater the difference between the ultimate flexural strength and the first crack strength. The results also showed that the flexural strength and  toughness of SFRHSC are remarkably larger than tbose of normal high strength concrete, however, the flexural elastic module of SFRHSC changes little.
Keywords: SFRHSC; flexural; flexural load-deflection curves; flexural strength; toughness; flexural elastic module