The Influence of Reinforced Concrete Beams Crack on Size Effect

Abstract:

We research the influence of reinforced concrete beams crack on size effect by using the fracture Mechanics analysis method and Fracture toughness. First, the weight of three spot curved beam ,the load ,the steel bar, and the cohesive strength of breaking-down process area were superimposed of the stress intensity factor which has in the crack tip, in order to examine whether it has surpassed the fracture toughness, and judge the crack whether will be to expand. Then we went to iterative computation through increasing the load and the crack length which obtained the carrying capacity of corresponding size component, we used the Matlab programming in the entire computational process. The result shows that although the steel bar limited crack expansion of concretes beams and caused “the plasticity” characteristic, the reinforced concrete beams had the size effect phenomenon still, it did not obvious compare with the plain concrete.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 254-258
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.254
• Online since: February 2012
• Authors: Yi Qin
• Keywords: Crack Expansion, Crack Model, Fracture Toughness, Reinforced Concrete (RC) Beam, Size Effect

References

[1] CHENG Jin,. Fracture mechanics [M]. Beijing: Science Publishing Company, (2006).

[2] HUANG Huangzhen, QIAN Juemin, etc. Analysis of brittleness indexes for the concrete based on size effect [J]. Sichuan Building Science, 2005, 31(3): 105—105.

[3] LI Qingfen. Fracture mechanics and its engineering application [M]. Harbin: Harbin engineering university press, (2007).

[4] China aviation research institute. Stress intensity factor manual [M]. Beijing: Science Publishing Company, (1993).

[5] Okamura, H., Watanabe, K. &Takano, T., Applictions of the compliance concepts in fracture mechanics [J]. ASTM STP 536, American Society for Testing and Materials, (1973)423-438.

[6] Gopalaratnam, Shah S h. Softening Response of a plain Concrete in Direct Tension [J]. ACI Materials Jounal, 1985, 82(3): 310-323.

[7] WU Zhimin, Analytical method for predicting effective fracture toughness of concrete and its size effect [J]. Journal of Hydraulic Engineering, 2006, 37 (7): 795—800.

[8] WANG Xuezhi, ZHANG Xiaogang, SONG Yupu, etal. Study on Effective Crack Model of Concrete with Multi-crack [J]. Journal of Water Power, 2006, 32 (2): 20—22, 44.