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2 2023

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Badania laboratoryjne wzmacnianych belek stalowych cienkościennych typu sigma za pomocą tkanin CFRP z zastosowaniem bezdotykowych metod optycznych

Dybizbański Maciej Adam, Rzeszut Katarzyna

Przegląd Budowlany

2023

R. 94, nr 7-8

111--116

W artykule przedstawiono wyniki badań laboratoryjnych dotyczących skuteczności wzmocnienia belek TWCFS typu sigma matami CFRP. Oryginalność zaproponowanej metody wzmocnienia polega na tym, że maty przyklejane są w poprzek przekroju poprzecznego, tworząc odcinkowo przekrój zamknięty. Pełnoskalowe testy laboratoryjne przeprowadzono na trzech belkach typu Σ200x70x2 poddanych czteropunktowemu zginaniu. Do wzmocnienia belek wykorzystano maty CFRP SikaWrap 230 C oraz klej SikaDur 330. Maty zostały naklejone na zagięciach brzegowych belek na szerokości 300 mm. Stwierdzono, że zaproponowane wzmocnienie pozwala na ograniczenie przemieszczeń poziomych belki.

This paper presents the results of laboratory tests on the effectiveness of reinforcing TWCFS sigma beams with bonded unidirectional CFRP fabrics. The originality of the proposed strengthening method lies in the fact that the mats are glued across the cross-section to form a fragmentarily closed section. Full-scale laboratory tests were carried out on three Σ200x70x2 beams subjected to four-point bending using, among others, ARAMIS system and a 3D laser scanner. SikaWrap 230 C CFRP mats bonded with SikaDur 330 adhesive were used to reinforce the beams. The mats were bonded at the edge bends of the beams over a width of 300 mm. The proposed reinforcement was found to reduce horizontal displacements of the beam.

Analysis of the Impact of Using CFRP Tapes on the Performance of Bent Thin-Walled Beams Connected with a Sandwich Panel – Pilot Studies

Szewczak Ilona

Advances in Science and Technology. Research Journal

2023

Vol. 17, no 4

282--289

The heightening use of thin-walled steel structures necessitates the search for fast and efficient methods of their reinforcement. One solution might be the application of bonded composite tapes. The author of the work has conducted a number of studies so far, which showed a beneficial effect of the use of bonded composite tapes to limit displacements and strains of bent thin-walled sigma beams. In practice, thin-walled steel beams of sigma section are most commonly used as purlins in steel halls, where they cooperate with the sandwich panel. To approach this issue, the present work describes pilot studies in which the effect of the use of composite tapes on the operation of bent thin-walled beams connected with a sandwich panel was analyzed. A four-point bending test was conducted on 9 thin-walled sigma beams Σ200x70x2, 3 meters long, connected with a 6 cm thick PIRTECH sandwich panel. Three samples were treated as reference, the next three were reinforced by bonding a composite tape to the lower flange of the steel beam, and the last three were reinforced by bonding a tape to the web. The conducted studies indicate that the adhesion of composite tapes to the lower flange of the thin-walled sigma beam cooperating with the sandwich panel allows for a significant reduction in beam strains and vertical displacements.