Einfluss von Querzugspannungen auf die Druckfestigkeit von Carbonbeton

Betz, P.; Marx, Steffen; Curbach, Manfred

doi:10.1002/best.202300028

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…The specimens were produced in two batches, with two specimens per batch tested at the same tensile loading level; see Table 1. The uniaxial compressive strength of these disc-shaped specimens was previously determined to be 87% of the prism strength [35]. This is in line with the results for the cubic specimens previously mentioned where a ratio of 0.9 was found.…”

Section: Compressive Strength With Transversal Tensile Stresssupporting

confidence: 91%

Classification of Multiaxial Behaviour of Fine-Grained Concrete for the Calibration of a Microplane Plasticity Model

Betz,

Curosu,

Loehnert

et al. 2023

Buildings

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Fine-grained high-strength concrete has already been tested extensively regarding its uniaxial strength. However, there is a lack of research on the multiaxial performance. In this contribution, some biaxial tests are investigated in order to compare the multiaxial load-bearing behaviour of fine-grained concretes with that of high-strength concretes with normal aggregate from the literature. The comparison pertains to the general biaxial load-bearing behaviour of concrete, the applicability of already existing fracture criteria and the extrapolation for the numerical investigation. This provides an insight into the applicability of existing data for the material characterisation of this fine-grained concrete and, in particular, to compensate for the lack of investigations on fine-grained concretes in general. It is shown, that the calibration of material models for fine-grained concretes based on literature results or normal-grained concrete with similar strength capacity is possible, as long as the uniaxial strength values and the modulus of elasticity are known. For the numerical simulation, a Microplane Drucker–Prager cap plasticity model is introduced and fitted in the first step to the biaxial compression tests. The model parameters are set into relation with the macroscopic quantities, gained from the observable behaviour of the concrete under uniaxial and biaxial compressive loading. It is shown that the model is able to capture the yielding and hardening effects of fine-grained high-strength concrete in different directions.

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Section: Compressive Strength With Transversal Tensile Stresssupporting

confidence: 91%

Classification of Multiaxial Behaviour of Fine-Grained Concrete for the Calibration of a Microplane Plasticity Model

Betz,

Curosu,

Loehnert

et al. 2023

Buildings

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“…Compression softening behaviour was observed for both, proportionally and sequentially loaded specimens (cf. Figure 8 (b)) and similar compressive strengths were reached for similar average tensile strains in transverse direction, confirming BETZ's [40] results for soft impregnated grids. However, despite comparable reductions in compressive strengths for both types of load application, clear differences in the stiffness and the load deformation behaviour can be observed.…”

Section: Sequential / Proportional Loadingsupporting

confidence: 85%

“…Recently, first tests on the biaxial compression-tension behaviour of CRC based on BOCHMANN's investigation of the uniaxial compressive behaviour of CRC [18]were conducted by BETZ ET AL. [40]. They used fine-grained concrete with a maximum aggregate size of 1 mm and soft impregnated grids, which resulted in a relevant reduction in compressive strength up to 40 % for casted panels in dependence on the maximum tensile strain in the yarns of up to approximately 7 ‰.…”

Section: Compressive Strength Of Crcmentioning

confidence: 99%

Compression Softening of Textile Cfrp Reinforced Concrete (Crc): Biaxial Testing of Cracked Crc Panels and Derivation of Constitutive Laws

Bosbach,

Hegger,

Classen

2023

Preprint

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Due to its insensitivity to corrosion, textile CFRP (carbon fibre reinforced polymer) reinforcement enables the construction of thin-walled concrete structures such as shells, vaults and girder webs with minimal concrete cover. In contrast to tensile and flexural behaviour, strutting and compressive membrane action of cracked thin-walled carbon reinforced concrete (CRC) elements and the interaction of compressive stresses with transverse tensile loading have not yet been investigated. While for steel reinforced concrete components, extensive biaxial testing has shown a significant reduction of concrete compressive strength as a function of the lateral tensile stress (compression softening), the effect of biaxial loading on CRC structures has not been quantified yet. However, a different behaviour is expected due to different bond properties of steel and CFRP in concrete, smaller crack spacings and the tendency of the CFRP reinforced concrete for in-plane splitting. This paper presents an extensive experimental campaign for investigation of the influence of transverse tension and cracking on the compressive strength of CRC with refined measurement techniques. Based on a literature review on compressive softening behaviour and conventional test setups for steel reinforced concrete, a novel test setup was developed. The phenomenology of compression softening in CRC as well as the main factors influencing compressive membrane behaviour are highlighted. Based on the experimental findings a constitutive law for compression softening behaviour of CRC is proposed.

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“…Hochleistungsbetonen mit größerer Gesteinskörnung werden die in der Literatur etablierten Würfel mit einer Kantenlänge von 100 mm verwendet [9-11, 16, 17, 21]. Die anschließende Parameterstudie wird an Scheiben der Abmessungen 200 × 200 × 40 mm 3 durchgeführt [22,23]. Orientiert wird sich bei diesen Abmessungen an Druck-Zug-Prüfkörpern aus der Literatur [10,11] sowie bei der Probendicke von 40 mm an bereits umgesetzten Bauwerken aus Carbonbeton [24,25].…”

Section: Prüfkörperunclassified

Mehraxiales Tragverhalten von hochfestem Feinbeton für die Carbonbetonanwendung

Betz,

Speck,

Marx

et al. 2023

Beton und Stahlbetonbau

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Für den Einsatz im Carbonbetonbau wurden hochfeste Feinbetone entwickelt, deren einaxiales Tragverhalten bereits umfassend untersucht wurde. Im Gegensatz dazu liegen über das Materialverhalten bei mehraxialer Beanspruchung bisher kaum Erkenntnisse vor. In diesem Beitrag wird für einen dieser Feinbetone die biaxiale Tragfähigkeit bei unterschiedlichen Lastverhältnissen untersucht und ein Vergleich mit dem Verhalten anderer biaxial beanspruchter hochfester Betone vorgenommen. Weiterhin wird der Einfluss der Probengeometrie diskutiert, wofür sowohl Versuche an kubischen als auch an scheibenförmigen Betonproben durchgeführt wurden. Abschließend wird der Einfluss des Herstellungsverfahrens, insbesondere des für die Carbonbetonbauweise typischen Laminierverfahrens, näher betrachtet. Diese Untersuchungen dienen als Grundlage für zukünftige Untersuchungen zur biaxialen Druckfestigkeit von Carbonbeton.

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Einfluss von Querzugspannungen auf die Druckfestigkeit von Carbonbeton

Cited by 6 publications

References 17 publications

Classification of Multiaxial Behaviour of Fine-Grained Concrete for the Calibration of a Microplane Plasticity Model

Classification of Multiaxial Behaviour of Fine-Grained Concrete for the Calibration of a Microplane Plasticity Model

Compression Softening of Textile Cfrp Reinforced Concrete (Crc): Biaxial Testing of Cracked Crc Panels and Derivation of Constitutive Laws

Mehraxiales Tragverhalten von hochfestem Feinbeton für die Carbonbetonanwendung

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