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(湖北工業(yè)大學(xué)土木工程與建筑學(xué)院，武漢 430064)

［摘要］對10根混雜纖維增強(qiáng)高性能混凝土深梁和1根普通高性能混凝土深梁進(jìn)行正截面受彎性能試驗(yàn)研究，分析混雜纖維對深梁工作性能和破壞形態(tài)、縱向受拉鋼筋應(yīng)變、深梁撓度的影響。深梁受彎過程具有明顯的纖維強(qiáng)化階段，混雜纖維的強(qiáng)化作用在縱向鋼筋屈服后充分發(fā)揮，同時(shí)摻加鋼纖維(0.6%～1.0%)和聚丙烯纖維(0.055%～0.11%)使深梁的開裂彎矩平均提高25%，屈服彎矩平均提高75%，極限承載力平均提高1.5倍。低體積摻量的鋼纖維和聚丙烯纖維混雜使用能明顯提高深梁的受彎極限承載力以及受彎韌性。

［關(guān)鍵詞］混雜纖維；深梁；高性能混凝土；抗裂；彎矩；受彎極限承載力

Flexural behavior of hybrid fiber reinforced high\|performance concrete deep beam

Xia Guangzheng, Xia Dongtao(School of Civil Engineering, Hubei University of Technology，Wuhan 430064, China)

Abstract:10 hybrid fibers reinforced high-performance concrete deep beams and an common one were tested. The effect of steel fibers and polypropylene fibers on the cracking resistance moment, yield moment and bending capacity of the normal section were analyzed. The reinforced and failure mechanisms of normal section were explored. It is shown that the average cracking moment increased 25%, the average yielding moment increased 75%, the average flexural capacity increased 1.5 times when added 0.6%～1.0%steel fibers and 0.055%～0.11% polypropylene fibers into deep beam.

Adding appropriate steel fibers and polypropylene fibers can significant improve ultimate flexural capacity and bending toughness of deep beam.

Keywords:hybrid fiber; deep beam; high-performance concrete; crack-resistant; moment; flexural capacity

*湖北省教育廳青年科學(xué)基金項(xiàng)目(B200514003)。

作者簡介：夏廣政，高級工程師，Email：xgzxy99@yahoo.com.cn。

參考文獻(xiàn)

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