配置局部钢纤维的钢筋混凝土板受冲切承载力试验研究*
- 摘 要
-
谢晓鹏1，岳鹏威1，高丹盈2（1 郑州航空工业管理学院土木建筑工程学院， 郑州 450015; 2 郑州大学土木工程学院, 郑州 450002）［摘要］通过对13块无腹筋简支整浇双向板的试验研究，探讨了混凝土强度、钢纤维体积率和钢纤维掺加范围对板冲切承载力的影响，分析了板冲切的破坏机构。试验结果表明，板冲切承载力随混凝土强度和钢纤维体积率的增大而提高，并存在2.0%的最佳钢纤维体积率。随着钢纤维掺加范围的增加，局部钢纤维高强混凝土板冲切承载力呈线性提高，但掺加范围增大到2倍板厚以上时，冲切承载力基本不再提高。根据试验结果，参照现行规范，并考虑主要影响因素，提出了适用于钢筋混凝土板、配置局部钢纤维的钢筋混凝土板以及钢纤维钢筋混凝土板冲切承载力的计算公式，计算结果与试验结果吻合较好。［关键词］钢纤维； 钢筋混凝土板； 冲切承载力中图分类号：TU375.2，TU317.1 文献标识码：A 文章编号：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*河南省科技厅攻关项目（122102210048）。作者简介：谢晓鹏，博士，副教授，Email：xxp760408@126.com。参考文献［1］李定国，舒兆发，余志武. 无冲切钢筋的钢筋混凝土板柱连接冲切极限承载力试验研究［J］.湖南大学学报，1986，13(3)：22-35.［2］林旭健. 钢纤维高强混凝土冲切板的试验研究［D］. 杭州：浙江大学，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］谢晓鹏. 局部钢纤维高强钢筋混凝土板冲切性能试验研究［D］.郑州：郑州大学，2007.［6］谢晓鹏,高丹盈,管巧燕.钢筋钢纤维增强混凝土板冲切性能试验研究［J］.工业建筑，2009(6)：96-100.［7］刘涛,冯伟,张智梅.钢纤维和碳纤维增强混凝土的抗压性能试验研究［J］.建筑结构,2007，37（12）：57-59.［8］CECS38:2004纤维混凝土结构技术规程［S］.北京：中国计划出版社，1996.［9］严宗达.用双剪强度理论解混凝土板冲切的轴对称问题［J］.工程力学，1996(2)：1-7.［10］俞茂宏.工程强度理论［M］.北京：高等教育出版社，1998.
