Analysis on Punching Shear Behavior of the Raft Slab Reinforced with Steel Fibers

Abstract:

The thickness of the raft slab is determined by punching shear. The raft slab is commonly thick, which causes concrete volume is large. Mass concrete can bring disadvantage to the foundation. In order to increase the bearing capacity and reduce the thickness, it is suggested that the raft slab to be reinforced by steel fibers. There are five groups of specimens in this paper. S1 is the common reinforced concrete slab. S2 and S3 are concrete slabs reinforced by steel fibers broadcasted layer by layer when casting specimen. S4 and S5 are concrete slabs reinforced by steel fibers mixed homogeneously when making concrete. The punching shear tests of these slabs were done. The test results indicate that the punching shear capacity of the slab reinforced with steel fibers is higher than that of concrete slab, the stiffness and crack resistance of the steel fibers reinforced concrete slab are better than those of the common concrete slab and the punching shear of the slabs with different construction methods of steel fibers is similar. It analyses the punching shear behavior of the slab reinforced with steel fibers and suggests the ultimate bearing formula. The calculative values are coincided with the measured values well.

• Periodical: Key Engineering Materials (Volumes 400-402)
• Pages: 335-340
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.400-402.335
• Online since: October 2008
• Authors: Xiao Wei Wang, Wen Ling Tian, Zhi Yuan Huang, Ming Jie Zhou, Xiao Yan Zhao
• Keywords: Punching Shear Capacity , Raft Slab, Steel Fiber (SF)

References

[1] Zhi Yuan Huang: Experimental and Applied Study on Raft Foundation Reinforced by Steel Fibers, master thesis of HeBei University of Technology (2004), p.10.

[2] Theodorakopoulos, D.D. and Swamy, R.N.: Ultimate punching shear strength analysis of slab-column connections, Journal of Cement and Concrete Composites 6(2002), p.509.

DOI: 10.1016/s0958-9465(01)00067-1

[3] Sheng Yuan Cao, Xiao Lin Guo: The punching shear mechanism and strength of reinforced concrete, The basic theory and application of concrete structure and the second symposium(1990).

[4] Guo Fan Zhao, Shao Min Peng and Cheng Xiang Huang: The steel fiber reinforced concrete structure, China Building Industry Press (1999), p.21.