Behaviour of CFS strengthened hot-rolled structural steel beams under flexure

Selvaraj, Sivaganesh and Madhavan, Mahendrakumar and Gopalan, Anadh Gopal Venu and Jayabalan, Aswin Kumar and Arumugam, Pavan Kumar (2017) Behaviour of CFS strengthened hot-rolled structural steel beams under flexure. ce/papers, 1 (2-3). pp. 4595-4604. ISSN 2509-7075

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Abstract

A strengthening system using cold-formed steel (CFS) channel as an encase to inhibit the lateral-torsional buckling (LTB) of hot rolled steel (HRS) channel is experimentally examined by conducting a four-point bending test. An advantage of this technique is that this retrofitting method can be applied in-situ by minimal manpower. The retrofit technique involves encasing the CFS channel to the HRS channel followed by interconnecting the two with spot welding. In general, the test results of the HRS channel retrofitted with CFS channel indicate that in addition to preventing the LTB mode of failure the moment capacity of the section increases by 60% compared to the control specimen. It was also found that the effectiveness of the retrofitting technique increases with an increase in the slenderness of the HRS channel along with an increase in the number of interconnecting spot welds. In addition, the test results indicate that the current specification for both HRS and CFS are not suitable for an HRS-CFS built-up section. Based on the test results a new interconnection spacing limitations to avoid the local buckling of the CFS channel is suggested.

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