Test for Crack Opening Displacement of Steel Fiber Reinforced Concrete under Three-Point Bending

Abstract:

Based on the principle of electrical measurement method, the clip gauge was made to measure the crack opening displacement (COD).Through the three-point bending test on the specimens of steel fiber reinforced high strength concrete (SFHSC), the effect of the fiber volume fraction (ρf) upon the critical crack opening displacement (the critical crack tip opening displacement and the critical crack mouth opening displacement) was studied. The result shows that the effect of ρf on mouth-tip ratio (the ratio of critical crack mouth opening displacement to critical crack tip opening displacement) can reflect its effect upon the critical crack opening displacement. According to the geometrical relationship between the initial crack length and the critical crack opening displacement，calculation method for the initial crack length was proposed. Based on the test result, the formula was established for calculating the critical crack tip opening displacement.

• Periodical: Applied Mechanics and Materials (Volume 36)
• Pages: 157-161
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.36.157
• Online since: October 2010
• Authors: Tin Gyi Zhang, Yuan Bao Leng, Dan Ying Gao
• Keywords: Concrete, Critical COD, Mouth-Tip Ratio, Steel Fiber (SF), Test

References

[1] D.Y. GAO, J.X. LIU: Steel Fiber Reinforced Concrete Elementary Theory, Scientific and Technical Documents Publishing House, Beijing, China, l994.

[2] Z. LUO, X.B. LI, T.H. LING: Study on the reinforcement mechanism and fracture mechanics model , Mining Research and Development, (2003) , p.18–22.

[3] A. A Wells: Application of Fracture Mechanics at and beyond General Yielding , British Welding J., Vol. 10(1963), pp.563-570.

[4] Z.Z. HUANG, C.P. JIANG: Damage and Fracture in Engineering , China Machine Press, Beijing, China, (2004).

[5] S.Z. YIN: Fracture damage Theory and Application, Tsinghua University Press, Beijing, China, (1992).

[6] Z.B. HUANG: Fracture mechanics, South China University of Technology Press, Guangzhou, China, (1988).

[7] C. YI, H.P. XIE, H.F. SUN . Steel Fiber Reinforced Concrete Fatigue Fracture Performance and Engineering Application , Science Press, Beijing, China, (2003).

[8] T.Y. Zhang, D.Y. GAO, H.T. ZHU: Fracture Toughness of Steel Fiber Reinforced High Strength Concrete , Journal of Building Materials, Vol. 10 (2007), pp.577-582.

[9] X.J. CHENG, W.X. ZHU: Calculation formula for KIC of steel fiber reinforced concrete, Journal of Hehai University, (2005), p.452–454.