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Determination of the Load-Bearing Capacity of the Bonded Joint of Hot-Dip Galvanised Steel Elements with CFRP Fabric – Pilot Laboratory and Numerical Investigations

Rzeszut Katarzyna, Dybizbański Maciej Adam, Szewczak Ilona

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 6

206--217

EN

In this paper, an attempt was made to determine the load-bearing capacity of a bonded joint of galvanized steel elements with CFRP fabric. This issue is extremely relevant to the use of bonded carbon fiber fabric as a mean of reinforcing hot-dip galvanized steel structures. This technique is used in engineering practice for both hot-rolled and cold-formed steel elements. In order to obtain the necessary parameters for modelling bonded joints of galvanised steel thin-walled elements, laboratory tests were carried out. In the first stage, four specimens made of 50 mm diameter steel cylinders bonded to 16 mm thick hot-dip galvanised steel sheet of S350 GD were subjected to the pull-off test. In this connection the SikaWrap 230C composite fabric embedded in SikaDur 330 adhesive layer was investigated. In the second stage, the axial tensile test of the bonded butt joint using the same materials was performed. In this stage, 10 hot-dip galvanised steel sheet samples of S350 GD and 16 mm thickness were tested. The discussion on the failure mechanism in the context of the bonding capacity of the composite joint was carried out. Moreover the advanced numerical model using the commercial FE program ABAQUS/Standard and the coupled Cohesive Zone Model was developed. The significant influence of the preparation method of steel element surface and the thickness of the adhesive layer on the failure mechanism of the joint and the value of the maximum failure force was shown.

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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

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2023

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R. 94, nr 7-8

111--116

PL

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.

EN

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.

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Experimental and Theoretical Investigation of Galvanized Steel and Fiber-Reinforced Polymer Composites Textile Adhesive Double Lap Joints

Dybizbański Maciej Adam, Rzeszut Katarzyna

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

110--120

EN

This paper presents an experimental analysis of CFRP fabric to galvanized steel adhesive connection. An experimental research has been conducted on the adhesive connection between CFRP fabric and galvanized steel subjected to shear forces. The specimens were made from the steel plates overlapped on both sides with SikaWrap 230 C fabric using SikaDur 330 adhesive. Observations of natures of failure for CFRP-Steel adhesive connection were conducted based on visual inspection using a scanning microscope. Mixed nature of the connection failure was specified. Moreover, an advanced numerical model has been developed and later on validated and verified on the basis of performed original laboratory tests. Ultimately, final conclusions were drawn based on the advanced numerical model that has been developed, verified and validated using laboratory tests results, as well as analytical models and nature of the connection failure was specified.