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（1 華北理工大學(xué)建筑工程學(xué)院， 唐山  063009； 2 河北省地震工程研究中心， 唐山 063009；3 貝卡爾特應(yīng)用材料科技(上海)有限公司， 上海 200131）

［摘要］纖維混凝土梁受彎或受剪時(shí)纖維的選取對(duì)纖維發(fā)揮抗彎或抗剪作用尤其重要。進(jìn)行了15組混雜纖維自密實(shí)混凝土梁的彎曲韌性試驗(yàn)和13根纖維增強(qiáng)鋼筋自密實(shí)混凝土梁的抗剪性能試驗(yàn)研究，將梁的抗彎、抗剪性能與相同條件的以往研究結(jié)果進(jìn)行對(duì)比。結(jié)果表明，單摻鋼纖維時(shí)，長度50mm、長徑比80的鋼纖維混凝土梁彎曲韌性好于長度35mm、長徑比64的鋼纖維混凝土梁，對(duì)梁的抗剪貢獻(xiàn)大；混雜長度50mm、長徑比80的鋼纖維混凝土梁與長度45mm、長徑比60的合成纖維混凝土梁的剩余抗彎強(qiáng)度fR,4 高于混雜長度50mm、長徑比80的鋼纖維混凝土梁與長度30mm、長徑比45的合成纖維混凝土梁，對(duì)梁的抗剪貢獻(xiàn)大；鋼纖維和合成纖維類型一定時(shí)，在混凝土梁中摻加摻量為（40+4）kg/m3的混雜纖維在提高梁的抗彎性能和抗剪性能方面好于摻加摻量為（30+5）kg/m3的混雜纖維，摻加摻量為（30+5）kg/m3的混雜纖維好于摻加摻量為（20+6）kg/m3的混雜纖維。

［關(guān)鍵詞］混雜纖維； 鋼筋混凝土梁； 彎曲韌性； 抗剪性能； 纖維選取

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)13-0078-07

Comparison of fibers in self-consolidating concrete flexural and shear beams

You Zhiguo1,2, Fu Xiuyan1,2, Zhou Yunlong1,2, Wang Peng1,2, Chen Xiangyu3, Dong Xuechao1,2

(1 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063009, China; 2 Earthquake Engineering Research Center of Hebei Province, Tangshan 063009, China; 3 Bekaert Applied Material Technology (Shanghai) Co.,Ltd., Shanghai, 200131, China)

Abstract:The fiber choices in fiber reinforced  concrete flexural and shear beam are very important to bending and shear actions played by fibers. The flexural toughness experiments on 15 series of hybrid fibers reinforced self-consolidating concrete beams and shear behavior experiments on 13 fiber reinforced self-consolidating concrete beams were studied. The bending and shear resistance  were compared to those of the past studies with similar experimental conditions. The research results can be obtained as follows.  When only steel fiber is added to beam, the flexural toughness and the contribution to shear resistance of steel fiber reinforced concrete with steel fiber of length of 50mm and length-to-diameter ratio of 80 are better than those of steel fiber reinforced concrete with steel fiber of length of 35mm and length-to-diameter ratio of 64. The residual bending strength fR,4 and the contribution to shear load of hybrid fiber reinforced concrete with steel fiber of length of 50mm, length-to-diameter ratio of 80 and synthetic fiber of length of 45mm, length-to-diameter ratio of 60 are better than those of hybrid fiber reinforced concrete with steel fiber of length of 50mm, length-to-diameter of 80 and synthetic fiber of length of 30mm and length-to-diameter of 45. For steel fiber and synthetic fiber with the same fiber type, the flexural and shear behavior of beam with hybrid fiber（40+4）kg/m3 is better than that of beam with hybrid fiber（30+5）kg/m3. The flexural and shear behavior of beam with hybrid fiber（30+5）kg/m3 is better than that of beam with hybrid fiber（20+6）kg/m3. 

Keywords:hybrid fiber; reinforced concrete beam; flexural toughness; shear behavior; fiber choice

*國家自然科學(xué)基金（51478161，51608196），華北理工大學(xué)培育基金項(xiàng)目(GP201523)。

作者簡介：尤志國，博士，副教授，碩士研究生導(dǎo)師，Email:youzhiguo119@163.com。