Advanced Steel Construction

Vol. 2, No. 3, pp. 185-198 (2006)


BOND FAILURE INVESTIGATION OF CFRP-STEEL ADHESIVE JOINTS

 

S. P. Chiew*, S. T. Lie, C. K. Lee and Y. YU

School of Civil and Environmental Engineering

Nanyang Technological University, Singapore

*(Email: This email address is being protected from spambots. You need JavaScript enabled to view it. Fax:+65-6792 1650)

 

DOI:10.18057/IJASC.2006.2.3.1

 

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ABSTRACT

To strengthen deteriorated steel structures, bonding carbon fiber reinforced polymer laminate externally to the steel surface is a promising method. For CFRP-strengthened steel structures, the bond performance between CFRP laminate and steel is a crucial consideration, which will directly influence strengthening effect and determine the final capacity of the strengthened structures. To investigate the bond failure mechanism of CFRP-bonded steel structures, tests for different types of CFRP-steel adhesive joints have to be conducted first. Besides the experimental studies, finite element analyses for the different types of joints are carried out to study in detail the stress and strain distributions along the bondline. It is found that for all joints with different geometries and loading conditions, the most important factors that influence the final bond failure are their peel and in-plane shear stress/strain components. Based on the test results and the finite element analyses, a bond failure model id proposed. With this bond failure model, the failure loads for the different joints can be predicted reasonably well compared to the experimental measurements.

 

KEYWORDS

Carbon fiber reinforced polymer, adhesive joint and bond failure


REFERENCES

[1]   Miller T.C., Chajes M.J., Mertz D.R. and Hastings J.N., “Strengthening of a steel bridge girder using CFRP plates”, Journal of Bridge Engineering, ASCE, 2001, 6(6), pp. 514-522.

[2]   Tavakkolizadeh M. and Saadatmanesh H., “Fatigue strength of steel girders strengthened with carbon fiber reinforced polymer patch”. Journal of Structural Engineering, ASCE, 2003, 129(2), pp. 186-196.

[3]   Jiao, H. and Zhao, X. L., “CFRP strengthened butt-welded very high strength (VHS) circular steel tubes”, Thin-Walled Structures, 2004,42(7), pp. 963-978.

[4]   Tong L. and Steven GP., “Analysis and Design of Structural Bonded Joints”, Kluwcr Academic, Boston, USA, 1999.

[5]   Ono K., Sugiura K., Sasaki A., Wakahara N. and Komaki II., “Bond characteristics of carbon fiber reinforced plastics to structural steels”, High Performance Materials in Bridges: Proceedings of the International Conference, Kona, Hawaii, 2001, pp. 34-43.

[6]   El Damatty A.A. and Abushagur M., “Testing and modeling of shear and peel behavior for bonded steel/CFRP connections”. Thin-Walled Structures, 2003,41(11), pp. 987-1003.

[7]   Sheppard A., Kelly D. and Tong L., “A damage zone model for the failure analysis of adhesively bonded joints”. International Journal of Adhesion & Adhesives, 1998, 18(6), pp. 385-400.

[8]   Hart-Smith, L. J., “Adhesive bond of aircraft primary structures”, High-Performance Adhesive Bond, Dearborn, Michigan, USA, 1980, pp. 1-17.

[9]   Lee. K.Y. and Kong, B.S., “Theoretical and experimental studies for the failure criterion of adhesively bonded joints”, Journal of Adhesion Science and Technology, 2000, 14(6), pp. 817-832.

[10] Clarke J.D. and McGregor I.J., “Ultimate tensile stress over a zone: a new failure criterion for adhesive joints", Journal of Adhesion, 1993,42(3), pp. 227-245.

[11] Oh, B. H., Cho, J. Y. and Park, D. G, “Failure behaviour and separation criterion for strengthened concrete members with steel plates”, Journal of Structural Engineering, ASCE. 2003, 129(9), pp. 1191-1198.