Improving the Flexural Stiffness and Lateral Torsional Buckling Behaviour of the Structural Steel Channel Sections by CFRP Strengthening

Selvaraj, S and Madhavan, Mahendrakumar and Dongre, S U and Vekatesan, J (2016) Improving the Flexural Stiffness and Lateral Torsional Buckling Behaviour of the Structural Steel Channel Sections by CFRP Strengthening. In: 8th International Conference on Steel and Aluminium Structures (ICSAS), DEC 07-09, 2016, Hong Kong, PEOPLES R CHINA.

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Abstract

An experimental study to investigate the stiffness and strength enhancement in structural steel channel section strengthened by six different carbon-fiber-reinforced polymer (CFRP) wrapping configurations is described in this paper. An approach of transforming the singly symmetric open section such as a channel section to a closed section by CFRP wrapping as a means to increase the stiffness and strength is demonstrated. The results indicate that the CFRP strengthened closed sections confined by bidirectional fabrics are effective in enhancing the strength and stiffness compared to CFRP skin strengthened sections (perimeter of bare steel channel sections overlayed with CFRP). The effectiveness of the closed section can be further improved by increasing the unidirectional CFRP layers prior to the final wrapping by bidirectional fibers. The variation in stiffness for all the CFRP configurations from the initial loading of specimens up to the ultimate is also investigated. This work demonstrates that the strength and stiffness of steel channel sections can be significantly enhanced by means of appropriate CFRP wrapping configuration.

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