配置局部鋼纖維的鋼筋混凝土板受沖切承載力試驗研究*
謝曉鵬1，岳鵬威1，高丹盈2
- 摘 要
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謝曉鵬1，岳鵬威1，高丹盈2（1 鄭州航空工業(yè)管理學(xué)院土木建筑工程學(xué)院， 鄭州 450015; 2 鄭州大學(xué)土木工程學(xué)院, 鄭州 450002）［摘要］通過對13塊無腹筋簡支整澆雙向板的試驗研究，探討了混凝土強(qiáng)度、鋼纖維體積率和鋼纖維摻加范圍對板沖切承載力的影響，分析了板沖切的破壞機(jī)構(gòu)。試驗結(jié)果表明，板沖切承載力隨混凝土強(qiáng)度和鋼纖維體積率的增大而提高，并存在2.0%的最佳鋼纖維體積率。隨著鋼纖維摻加范圍的增加，局部鋼纖維高強(qiáng)混凝土板沖切承載力呈線性提高，但摻加范圍增大到2倍板厚以上時，沖切承載力基本不再提高。根據(jù)試驗結(jié)果，參照現(xiàn)行規(guī)范，并考慮主要影響因素，提出了適用于鋼筋混凝土板、配置局部鋼纖維的鋼筋混凝土板以及鋼纖維鋼筋混凝土板沖切承載力的計算公式，計算結(jié)果與試驗結(jié)果吻合較好。［關(guān)鍵詞］鋼纖維； 鋼筋混凝土板； 沖切承載力中圖分類號：TU375.2，TU317.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)05-0082-06Experimental research on punching shear bearing capacity of locally steel fiber reinforced concrete slabsXie Xiaopeng1, Yue Pengwei1 , Gao Danying2(1 School of Civil Construction Engineering, Zhengzhou Institute of Aeronautical Industry Management,Zhengzhou 450015, China; 2 School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, China)Abstract: The influences of concrete strength, steel fiber volume fraction and additional range on the punching shear bearing capacity of slabs were discussed through the experiment of 13 two-way slabs with simply supported. Multiple mechanisms for punching shear failure were analyzed. The experimental results show that the punching shear bearing capacity of the slabs increases with the increasing of concrete strength or steel fiber volume fraction. The optimal steel fiber volume fraction（2.0%）was obtained. With the increasing of the volume fraction or additional range of steel fiber, the punching shear bearing capacity of steel fiber locally reinforced high strength concrete slabs increases linearly. The punching shear bearing capacity hardly increases when additional range of steel fiber is improved more than two times of slab thickness. Based on the experimental results and according to the active codes, the formula of punching shear ultimate bearing capacity for concrete slabs, steel fiber locally reinforced concrete slabs and steel fiber reinforced concrete slabs was presented, considering the main factors which influence the punching shear ultimate bearing capacity of concrete slabs.The calculating results correspond well with the experimental data.Keywords: steel fiber; reinforced concrete slab; punching shear bearing capacity*河南省科技廳攻關(guān)項目（122102210048）。作者簡介：謝曉鵬，博士，副教授，Email：xxp760408@126.com。參考文獻(xiàn)［1］李定國，舒兆發(fā)，余志武. 無沖切鋼筋的鋼筋混凝土板柱連接沖切極限承載力試驗研究［J］.湖南大學(xué)學(xué)報，1986，13(3)：22-35.［2］林旭健. 鋼纖維高強(qiáng)混凝土沖切板的試驗研究［D］. 杭州：浙江大學(xué)，1999.［3］BRASTRUP M W, NILSON M P. Axisymmetric punching of plain and reinforced concrete［R］. Copenhagen Technology University, Denmark Structure Research Lab. Report R75,1976.［4］JIANG DAHUA, SHEN JINGHUA. Strength of concrete slabs in punching shear［J］. Journal of Structural Engineering, 1986,112(12)：2578-2591.［5］謝曉鵬. 局部鋼纖維高強(qiáng)鋼筋混凝土板沖切性能試驗研究［D］.鄭州：鄭州大學(xué)，2007.［6］謝曉鵬,高丹盈,管巧燕.鋼筋鋼纖維增強(qiáng)混凝土板沖切性能試驗研究［J］.工業(yè)建筑，2009(6)：96-100.［7］劉濤,馮偉,張智梅.鋼纖維和碳纖維增強(qiáng)混凝土的抗壓性能試驗研究［J］.建筑結(jié)構(gòu),2007，37（12）：57-59.［8］CECS38:2004纖維混凝土結(jié)構(gòu)技術(shù)規(guī)程［S］.北京：中國計劃出版社，1996.［9］嚴(yán)宗達(dá).用雙剪強(qiáng)度理論解混凝土板沖切的軸對稱問題［J］.工程力學(xué)，1996(2)：1-7.［10］俞茂宏.工程強(qiáng)度理論［M］.北京：高等教育出版社，1998.
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