Influence of the Initial Imperfection on the Buckling of Steel Member Wrapped by Carbon Fibre

Abstract:

Based on Ježek method of computing the elastic-plastic buckling of the member under the axial compressive load and the bending moment, considering the initial geometric imperfection, the analytical expressions of calculating the ultimate load of buckling about the neutral axis with the maximum moment of inertia for an H-shaped member with flange outsides wrapped by carbon fibre are derived. Using the elastic-plastic finite element method and the theory of nonlinear buckling, the impact of the initial geometric imperfection on the H-shaped steel member wrapped by carbon fibre under the axial compressive load and the bending moment are analyzed and the numerical solutions of ultimate bearing capacity are obtained. By compared with the values of the finite element method (FEM), it shows that the analytical method in this paper is valid. Compared the reinforced effect of the carbon fibrer to the perfection member with the defect member, we find that the former is higher than the latter. The results of the example also show that the presence of initial geometric imperfection reduces the ultimate bearing capacity of the steel member to a great extent. The influence of defect member gradually decreases when the given moment rises.

• Periodical: Applied Mechanics and Materials (Volumes 166-169)
• Pages: 738-742
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.166-169.738
• Online since: May 2012
• Authors: Peng Niu, Gang Yang, Chun Fu Jin, Xinxiang Li
• Keywords: Carbon Fibrer, Initial Geometric Imperfection, Ježek Method, Steel Structure

References

[1] Gang Yang , Haibin Wang, Aifeng Zhang, et al . Engineering Mechanics Vol.5(2007),P.53.

[2] Peng Niu, Gang Yang, Chunfu Jin, et al. Engineering Mechanics Vol.27(2010) , P.85.(in Chinese)

[3] Gu Dimin. Journal of Harbin University of Civil Engineering and Architecture.(1985), Vol.1, P. 86 .(in Chinese)

[4] Liu X,Silva P F ,Nanni A. Proc. CCC2001 , Composites in Construction ,Porto.Portugal :2001.

[5] Frent CMiller , Michael J Chajes ,Dennis RMertz ,et al . Journal of Bridge Engineering , Vol. 6 (2001) , P. 514.

[6] Chen Ji. Beijing: Science Press,2003. (in Chinese)

[7] Yiping Yin, Fanghan Qin. Journal of Huazhong University of Science and Techenology, Vol.25 (2008),P.128 .(in Chinese)