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焦楚杰，  彭春元，楊作用，  張文華 （廣州大學(xué)土木工程學(xué)院，廣州510006）

[摘要]  對(duì)鋼纖維體積率(V_f)為0~3%的鋼纖維高強(qiáng)混凝土(SFRHSC)進(jìn)行抗彎性能測(cè)試，試驗(yàn)結(jié)果表明，SFRHSC試件整個(gè)破壞過程類似于鋼筋混凝土適筋梁，且V_f越大，延性破壞特征越明顯，荷載-撓度曲線的峰值越大，下降段越平緩。SFRHSC的抗彎強(qiáng)度和韌度均顯著高于普通高強(qiáng)混凝土，而且極限抗彎強(qiáng)度與初裂抗彎強(qiáng)度的差值隨V_f的提高而增大，但抗彎彈性模量未有明顯的變化。
[關(guān)鍵詞]  鋼纖維高強(qiáng)混凝土；彎曲；荷載-撓度曲線；抗彎強(qiáng)度；韌度；抗彎彈性模量

    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