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Effect of GFRP strengthening on the flexural behaviour of cold-formed steel built-up beams

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Abstract

Closed sections are efficient at producing adequate resistance to high load demands, and their effectiveness is primarily determined by the robustness of the built-up sections' architecture and detailing. The previous studies on cold-formed steel (CFS) sections have identified the importance of hollow flanges in improving the flexural response in beams through their added stability features. In those past studies, it was further observed that lightweight materials like timber, cardboard, etc. have immense potential in enhancing the buckling resistance of compression zones in flexural members. However, the findings on the performance of CFS beams with glass fibre-reinforced polymer (GFRP) planks are missing in the literature. This study presents an experimental programme that focuses on the flexural behaviour of rectangular hollow flanged CFS beams strengthened with GFRP pultruded planks. Three CFS channel sections were used to construct the steel part of each beam model, with GFRP planks as packing material placed in the hollow flange and web region. Self-drilling screws were used to fasten the various elements of each test model. Four test models with simply supported end conditions were tested under monotonic four-point loading. The main objective of this investigation was to analyse the role of GFRP planks in enhancing the buckling resistance of the compression zones of such sections. Material properties of steel were determined before the model testing. Peak loads, load–displacement relationships and failure modes of the models were studied. Also, the strength based on the Indian and American codes was determined for comparison with the test results. The adoption of GFRP packing improved the structural characteristics of rectangular hollow flanges CFS beams significantly. The gains in the flexural capacity, stiffness and strength-to-weight ratio were noted as 83.1%, 43.9% and 48.4%, respectively, when compared with the conventional rectangular flanged CFS built-up beams. Both the American as well as the Indian code over-predicted the moment capacity of the bare CFS built-up beams and underpredicted the same when the GFRP packing was adopted.

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  1. Department of Civil Engineering, National Institute of Technology Srinagar, Srinagar, J&K, 190006, India

    A. R. Dar

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Dar, A.R. Effect of GFRP strengthening on the flexural behaviour of cold-formed steel built-up beams. Innov. Infrastruct. Solut. 7, 5 (2022). https://doi.org/10.1007/s41062-021-00608-8

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