Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures

Kasper, Yann; Gessler, A.; Ledecký, Lukáš; Pasternak, Hartmut; Ummenhofer, T; Ciupack, Yvonne; Albiez, Matthias; Feldmann, Markus

doi:10.1201/9780429426506-370

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…An innovative reinforcement measure using slack or pretensioned adhesively bonded CFRP lamellas shows great potential for the repair of cracks in steel structures subject to fatigue (Kasper et al, 2019(Kasper et al, , 2020a(Kasper et al, , 2020b. The established methods such as repair welding, drilling the crack tip or screwing of prestressed steel sheets have some significant disadvantages compared to the innovation method using adhesively bonded CFRP lamellas.…”

Section: Reinforcement Of Fatigue-stressed Steel Parts With Adhesivel...mentioning

confidence: 99%

Experimental Investigations on Innovative Crack Repair Methods and Reinforcing Steel Structures With Adhesivly Bonded CFRP – Lamellas

Sternsdorff

Ciupack

Pasternak

2022

Engineering Structures and Technologies

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The paper describes some of the experiments carried out at the Chair of Steel and Timber Construction to reinforce steel with adhesively bonded CFRP lamellas. The first topic deals with the repair of cracks in steel structures exposed to fatigue. The aim was to extend the remaining service life of these components by means of adhesively bonded CFRP lamellas and then to compare the results obtained with established methods for repairing cracks. In order to improve the informative value of the investigations, several test parameters such as adhesive candidates, temperature, creep effects, degrees of prestressing, load levels and the position of the reinforcement measures were varied. The second set of topics examined the extent to which a typical steel beam-to-column connection can be reinforced with the help of adhesively bonded CFRP lamellas.

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Section: Reinforcement Of Fatigue-stressed Steel Parts With Adhesivel...mentioning

confidence: 99%

Experimental Investigations on Innovative Crack Repair Methods and Reinforcing Steel Structures With Adhesivly Bonded CFRP – Lamellas

Sternsdorff

Ciupack

Pasternak

2022

Engineering Structures and Technologies

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“…To increase the level of toughness, different solutions are possible, all aiming at high amounts of elastic particles, as small as possible in size and well-connected but also distributed properly in the primarily stiff epoxy matrix. Sikadur ® 370 is a newly developed toughened epoxy adhesive combining high toughness with higher stiffness and strength, also showing a high fatigue capacity [15,16]. This makes it ideal for strengthening steel substrates in retrofitting applications [17].…”

Section: Introductionmentioning

confidence: 99%

Efficiency of CFRP Strengthening Measures for Reinforced Concrete Structural Members Using Toughened Epoxies

Achillopoulou,

Kosta,

Stamataki

et al. 2024

Construction Materials

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This paper aims to investigate the interface efficiency of Carbon Fiber Reinforced Polymers (CFRP) adhesively bonded on concrete, a commonly used retrofitting measure applied for enhancing the deformability and strength of decaying structures or existing ones with low capacity. The efficiency quantification is expressed with the Interface Capacity Index (IC). The index correlates the thickness and strength of each layer of the strengthening system and accounts for the transferred loads (ICL) and the strain distribution that causes the failure propagation on the concrete substrate (ICfp). The investigation focuses on different CFRP strengthening schemes (laminated fabrics, prefabricated plates, Near Surface Mounted bars-NSM) applied to concrete substrates using different adhesive layers. Two cases were studied for different levels of concrete’s integrity: (a) healthy and (b) containing corrosion products. The experimental results were used to calibrate the numerical models and to evaluate the effects of different strengthening strategies. The results show the tendency of the strengthening systems to shift the interface performance from fully elastic to non-linear. Further, the quantification of the efficiency of retrofitting can be addressed by accounting for the mechanical and geometrical properties at the interface level, representing different failure modes and integration levels.

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Instandsetzung und Verstärkung von Stahlkomponenten mit vorgespannten CFK‐Materialien

Ghafoori,

Possekel,

Heydarinouri

et al. 2024

Stahlbau

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Um die schlimmsten Auswirkungen des Klimawandels abzuwenden, hat sich die internationale Gemeinschaft dem Ziel Net‐Zero 2050 verschrieben. Die Rohstahlproduktion verursacht einen sehr hohen Anteil an den weltweit ausgestoßenen CO2‐Emissionen. Die Internationale Energieagentur schätzt, dass die direkten CO2‐Emissionen durch die Rohstahlproduktion bei etwa 1,4 t CO2 pro Tonne Stahl liegen. Zur Erreichung der Klimaneutralität bis 2050 muss die Stahlindustrie ihre Treibhausgasemissionen drastisch reduzieren. Dieses Ziel kann neben umweltfreundlicher Stahlproduktion durch lebensdauerverlängernde Instandsetzungsmaßnahmen oder Wiederverwendung bestehender Tragstrukturen effektiv vorangetrieben werden. Hiermit können bspw. Umweltemissionen aus möglicher Erneuerung der Tragstrukturen eingespart und damit der Bedarf an neuem Rohstahl reduziert werden. Die Verwendung von carbonfaserverstärktem Kunststoff (CFK) bietet ein großes Potenzial für die Verlängerung der Lebensdauer von Stahlkonstruktionen. In diesem Beitrag werden die Hauptunterschiede bei den Bemessungsanforderungen für CFK‐verstärkte Stahlkomponenten erörtert. Des Weiteren wird ein Überblick über die bereits entwickelten Verstärkungssysteme und Einsatzmöglichkeiten gegeben, der schlaffe und vorgespannte mechanische Verankerungen sowie geklebte CFK‐Platten und ‐Stäbe umfasst. Abschließend werden einige Praxisanwendungen zur Ermüdungsverstärkung von alten Stahlbrücken vorgestellt und erläutert.

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Application of carbon fibre composite materials for the rehabilitation of fatigue damaged steel structures

Cited by 4 publications

References 1 publication

Experimental Investigations on Innovative Crack Repair Methods and Reinforcing Steel Structures With Adhesivly Bonded CFRP – Lamellas

Experimental Investigations on Innovative Crack Repair Methods and Reinforcing Steel Structures With Adhesivly Bonded CFRP – Lamellas

Efficiency of CFRP Strengthening Measures for Reinforced Concrete Structural Members Using Toughened Epoxies

Instandsetzung und Verstärkung von Stahlkomponenten mit vorgespannten CFK‐Materialien

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