Abstract
This paper presents selected issues related to the reinforcement of steel element cold-formed with CFRP tapes. The first section of the paper is a review of source literature and a presentation of the basic information on cold-formed thin-walled steel elements and CFRP composite materials, stressing the advantages and disadvantages of using them to reinforce steel structures. Next, the authors present original research on reinforcing bent thin-walled sigma-type steel beams using adhesive CFRP tapes. Reference beams with a cross-section of Σ200 × 70 × 2 and a length of 3 m, reinforced with CFRP tape, were tested in the four-point bending scheme. Then, the paper discusses a developed numerical model that is consistent with the subject matter of the laboratory tests. The developed numerical model was prepared to represent the failure of the connection between the beam and the composite tape. This was followed by a number of numerical analyses in order to determine the optimum adhesive layer that would allow us to achieve the maximum reduction of the displacements and strains in bent thin-walled sigma-type beams. Three thicknesses of the SikaDur adhesive layer were analyzed in the study. Based on the analyzes, it was found that the increase in the thickness of the adhesive layer slightly reduced the strain and displacement in the beams, but caused a significant decrease in the load value, at which damage appeared in the glued joint.
Highlights
Forming main load-bearing elements of building structures from cold-formed sections enables us to satisfy requirements in terms of load-bearing capacity, durability, reliability, aesthetics and functionality, and satisfy requirements associated with the concept of sustainable construction, under the strategy of sustainable economic growth, owing to responsible consumption and production that takes into account the impact of construction on climate change
The numerical model developed for the purposes of this study indicated high compliance with the laboratory tests carried out
- With the increase in the thickness of the adhesive layer, the value of the load at which the first defects appeared in the adhesive layer decreased;
Summary
Forming main load-bearing elements of building structures from cold-formed sections enables us to satisfy requirements in terms of load-bearing capacity, durability, reliability, aesthetics and functionality, and satisfy requirements associated with the concept of sustainable construction, under the strategy of sustainable economic growth, owing to responsible consumption and production that takes into account the impact of construction on climate change. It seems necessary to search for an effective and easy method of reinforcing these beams. One of such methods may be the application of composite materials (FRP—fibre-reinforced polymers/plastics), which are based on high-strength non-metallic fibres embedded in an epoxy matrix, e.g., CFRP, GFRP and AFRP tapes, made of carbon, glass and aramid fibres, respectively. These tapes are glued to the structure, ensuring rapid and effective strengthening, virtually without limiting operational continuity
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