Ermüdungsverhalten von Carbonbeton unter Zugschwellbelastung

Wagner, Juliane; Spelter, Arne; Hegger, Josef; Curbach, Manfred

doi:10.1002/best.201900104

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…This indicates that the carbon reinforcement indeed transferred the majority of the load during the last load stage. This suggests that it features good fatigue behaviour, which has been observed in other projects [40,79]. However, further investigations are required for verification.…”

Section: Results Of Tests With Cyclic Loadingsupporting

confidence: 71%

Flexural and Shear Tests on Reinforced Concrete Bridge Deck Slab Segments with a Textile-Reinforced Concrete Strengthening Layer

et al. 2020

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Many older bridges feature capacity deficiencies. This is mainly due to changes in code provisions which came along with stricter design rules and increasing traffic, leading to higher loads on the structure. To address capacity deficiencies of bridges, refined structural analyses with more detailed design approaches can be applied. If bridge assessment does not provide sufficient capacity, strengthening can be a pertinent solution to extend the bridge’s service lifetime. For numerous cases, applying an extra layer of textile-reinforced concrete (TRC) can be a convenient method to achieve the required resistance. Here, carbon fibre-reinforced polymer reinforcement together with a high-performance mortar was used within the scope of developing a strengthening layer for bridge deck slabs, called SMART-DECK. Due to the high tensile strength of the carbon and its resistance to corrosion, a thin layer with high strength and low additional dead load can be realised. While the strengthening effect of TRC for slabs under flexural loading has already been investigated several times, the presented test programme also covered increase in shear capacity, which is the other crucial failure mode to be considered in design. A total of 14 large-scale tests on TRC-strengthened slab segments were tested under static and cyclic loading. The experimental study revealed high increases in capacity for both bending and shear failure.

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Section: Results Of Tests With Cyclic Loadingsupporting

confidence: 71%

Flexural and Shear Tests on Reinforced Concrete Bridge Deck Slab Segments with a Textile-Reinforced Concrete Strengthening Layer

et al. 2020

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“…B. überproportionaler Dehnungszuwachs). Dies bestätigt das gutmütige Ermüdungstragverhalten der Carbonbewehrung, das auch in anderen Vorhaben [33, 34] beobachtet werden konnte. Jedoch sind weiterführende Untersuchungen zur Absicherung erforderlich.…”

Section: Experimentelle Untersuchungenunclassified

Experimentelle Untersuchungen zur Verstärkung von Brückenfahrbahnplatten mit Textilbeton

Adam

Bielak

Will

et al. 2020

Beton und Stahlbetonbau

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Etwa die Hälfte der Straßenbrücken in Deutschland wurde vor 1985 gebaut. Als Folge des gestiegenen Verkehrsaufkommens und strengerer normativer Anforderungen kann der Tragfähigkeitsnachweis durch eine Brückennachrechnung häufig nicht erbracht werden. Durch eine gezielte Tragwerksverstärkung lässt sich die Restnutzungsdauer verlängern, was eine erweiterte Planungsphase und Entzerrung der Baumaßnahmen von Ersatzneubauten ermöglicht. Am Institut für Massivbau (IMB) der RWTH Aachen wurden Versuche zur Ermittlung des Biege‐ und Querkraftverstärkungspotenzials einer Querschnittsergänzung der Brückenfahrbahnplatte mit Carbonbeton durchgeführt. Im vorliegenden Beitrag werden 17 Bauteilversuche an Fahrbahnplattenstreifen vorgestellt (verstärkte Versuchskörper und unverstärkte Referenzen). Dabei erfolgte ein Großteil der Versuche mit statischer Belastung, zwei Tastversuche wurden zyklisch beansprucht.

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“…As a result, it is often not possible to achieve the service lives assumed in the design of RC structures, so that either expensive repairs or entire replacement structures are required. In order to counteract this issue, researchers all over the globe investigate the potential of alternative reinforcement materials such as fibre-reinforced polymers (FRP) [2][3][4][5][6][7][8][9][10]. Carbon fibre-reinforced polymer (CFRP) reinforcement in particular has proven to be a reasonable alternative due to its resistance to corrosion and other chemical and physical attacks as well as its high tensile strength and relatively high modulus of elasticity compared to other fibre materials.…”

Section: Introductionmentioning

confidence: 99%

Structural behaviour of CFRP reinforced concrete members under monotonic and cyclic long-term loading

et al. 2021

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A large percentage of the damages to reinforced concrete structures is caused by corrosion of the reinforcement steel, which often leads to expensive repairs or new construction of existing structures. Due to their high strength and resistance to corrosion, reinforcements made of carbon fibre-reinforced polymers (CFRP) are becoming more and more important in structural engineering. It is expected, that the service life of CFRP reinforced concrete (RC) members can be significantly increased as the strength-reduction due to corrosion is negligible compared to conventional RC members. Therefore, precise knowledge of the long-term behaviour of CFRP RC members is required in order to ensure safe and economic design. This paper presents experimental investigations on the long-term behaviour of CFRP RC members as well as steel-reinforced RC members under monotonic and cyclic long-term loading with varying load levels, different cross-sectional shapes and shear slendernesses. Accompanying experiments on the concrete creep behaviour that were conducted within the investigations are shown. Within the scope of the experiments, the deflections as well as the strains on the top and bottom side of the RC members were measured using displacement sensors and strain gauges. The experimental data is evaluated, especially with regard to the time-dependent deflections. The data is compared to existing mechanical and empirical models, which are usually derived for steel-reinforced RC members. Based on the experimental data, the time-dependent reduction of stiffness and conclusions for the calculation of deflections are shown.

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Ermüdungsverhalten von Carbonbeton unter Zugschwellbelastung

Cited by 13 publications

References 19 publications

Flexural and Shear Tests on Reinforced Concrete Bridge Deck Slab Segments with a Textile-Reinforced Concrete Strengthening Layer

Flexural and Shear Tests on Reinforced Concrete Bridge Deck Slab Segments with a Textile-Reinforced Concrete Strengthening Layer

Experimentelle Untersuchungen zur Verstärkung von Brückenfahrbahnplatten mit Textilbeton

Structural behaviour of CFRP reinforced concrete members under monotonic and cyclic long-term loading

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