Influence of experimental setups on the apparent uniaxial tensile load-bearing capacity of Textile Reinforced Concrete specimens

Hartig, Jens; Jesse, Frank; Schicktanz, Kai; Häußler‐Combe, Ulrich

doi:10.1617/s11527-011-9775-0

Cited by 95 publications

(78 citation statements)

References 15 publications

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“…Whereas the design of the bending test setup is relatively simple, the design of the tensile test setup represents a non-trivial problem. A variety of setups have been presented in recent years [3,8,9]; an overview and classification is provided in [7].…”

Section: Experimental Characterization Of Trc 21 Test Setups For Tenmentioning

confidence: 99%

“…The setup with butt strap clamps [7,9] is appealing owing to the simplicity of specimen production and the gradual and smooth load transfer into the specimen along the clamped zone. It is especially suitable for thin crosssections with only a few layers of textile fabrics.…”

Section: Experimental Characterization Of Trc 21 Test Setups For Tenmentioning

confidence: 99%

“…In order to explain the concept, let us briefly review the strain-hardening behaviour of the brittle matrix composite depicted in Figs. 2b and 2c with three distinct stages [7,8,14,15]: I) uncracked stage, IIa) distributed cracking of the concrete matrix and IIb) post-cracking stage with a saturated crack pattern. The composite stresses shown in Fig.…”

Section: Quality Of the Measured Tensile Test Datamentioning

confidence: 99%

“…Therefore, the cross-sectional strength characteristics of TRC have to be determined experimentally for each material combination considered. For this purpose, several types of test setup have been developed recently [3,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

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Thin‐walled shell structures made of textile‐reinforced concrete

Scholzen

Chudoba

Hegger

2015

Structural Concrete

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The present paper describes a design approach for textile-reinforced concrete (TRC) Whereas steel-reinforced concrete cross-sections can be designed and dimensioned solely based on the material laws for steel and concrete, the direct design of TRC crosssections using the component characteristics is not yet possible. The reason or this is the existence of a wide variety of textile fabrics [6] differing in material, type of weave and coating, which affect the stress-strain response of the composite quite significantly. Therefore, the cross-sectional strength characteristics of TRC have to be determined experimentally for each material combination considered. For this purpose, several types of test setup have been developed recently [3, 7, 8, 9].The existing engineering models for TRC [1, 2, 3] have been derived mostly for relevant uniaxial stress states, e.g. for TRC beam or truss elements. However, as documented in [10], by using simple linear finite element analyses, it is possible to exploit the high potential of this composite material, especially in thin shell structures. However, engineering models and design tools for TRC shell structures are still lacking. In this paper, we propose a systematic approach to the ultimate limit state assessment of spatial TRC structures with complex loading scenarios. Compared with the engineering models mentioned, two additional important effects are included in the design approach: i) simultaneous action of normal forces and bending moments on a TRC shell cross-section and ii) a strength reduction due to the direction of loading not being aligned with the orientation of the textile fabrics.The paper starts with a review of the test setups used for deriving the strength characteristics of the TRC crosssection (section 2.1). This is followed by a brief discussion of the test data interpretation (section 2.2). A simplified n-m interaction diagram for combined loading is introduced in section 3.1 and extended with the effect of oblique loading and butt joints between the fabrics in sections 3.2 and 3.3 respectively. The general assessment criterion is then given in section 3.4. The proposed automated assessment procedure accounting for the anisotropy of the TRC shell exposed to general loading conditions is described in section 3.5. An example of the application of the assessment procedure is given in section 4 for a roof structure in double curvature, including the evaluation of the cross-sectional strength characteristics in section 4.1 and the evaluation of the utilization ratio in section 4.2. The non-linear loadbearing behaviour of TRC and the structural reserves available due to stress redistributions within the shell are studied numerically in section 4.3. The present paper extends and generalizes the concepts originally published in the German language [11].

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Section: Experimental Characterization Of Trc 21 Test Setups For Tenmentioning

confidence: 99%

Section: Experimental Characterization Of Trc 21 Test Setups For Tenmentioning

confidence: 99%

Section: Quality Of the Measured Tensile Test Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thin‐walled shell structures made of textile‐reinforced concrete

Scholzen

Chudoba

Hegger

2015

Structural Concrete

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“…In terms of clamping, according to Harting et al [13], this type of set-up involving glued steel plates can be classified as ''rigid load application'': concrete cracking is prevented within the supported range, while the main transfer mechanism between specimen and clamping device is adhesive tension and shear. On the contrary, in terms of displacements allowed at the ends, it might …”

Section: Test Set-upmentioning

confidence: 99%

Erratum to: Textile Reinforced Concrete: experimental investigation on design parameters

et al. 2013

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Textile Reinforced Concrete (TRC) is an advanced cement-based material in which fabrics used as reinforcement can bring significant loads in tension, allowing architects and engineers to use thin crosssections. Previous research projects, developed during the last 10 years mainly in Germany, Israel and the USA, have shown the capabilities of such a material. In this paper an extensive experimental investigation of TRC is presented: tensile tests were carried out to obtain a complete mechanical characterization of the composite material under standard conditions, considering the influence of different variables such as reinforcement ratio, fabric geometry, curing conditions, displacement rate and specimen size.

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Leichte Dachschalen aus Carbonbeton

Scholzen

Chudoba

Hegger

et al. 2016

Beton und Stahlbetonbau

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BERICHT entwickelten Methodik sollte im Forschungsprojekt unter baupraktischen Rahmenbedingungen anhand eines großformatigen Demonstratorbauwerks getestet werden. Entwurf und Abmessungen der Dachkonstruktion werden in Abschn. 2 vorgestellt. Als mögliche textile Bewehrungsmaterialien werden unterschiedliche Fasermaterialien und Bewehrungsgrade untersucht und auf Grundlage der Versuchsergebnisse der endgültige Querschittsaufbau für die Dachschalen festgelegt (Abschn. 3). Die experimentell bestimmte Querschnittstragfähigkeit wird anschließend den statischen Anforderungen aus der Finite-Elemente-Berechnung gegenübergestellt und der Nachweis im Grenzzustand der Tragfähigkeit geführt (Abschn. 4). Die Produktion der Dachelemente wird in Abschn. 5 erläutert. Die Herstellung konnte anhand von drei Prototypen optimiert werden, an denen ebenfalls die rechnerische Tragfähigkeit im Bauteilversuch verifiziert wurde. Zudem dienten die Prototypen dazu, die mit unterschiedlichen Verfahren erreichbaren Ausführungsqualitäten zu evaluieren (Abschn. 6). Die Realisierung des geplanten Demonstratorbauwerks wird abschließend in Abschn. 7 erläutert, wobei insbesondere Transport und Montage der filigranen Fertigteile im Fokus stehen. 2 Entwurf und Materialeigenschaften 2.1 Beschreibung der Tragstruktur Bild 1 zeigt die Tragstruktur des Demonstratorbauwerks aus fünf dünnwandigen Textilbeton-Dachschalen, die auf einer Stahlunterkonstruktion aufliegen und die Überdachung eines Fahrradabstellplatzes bilden. Die Stahl-1 Einleitung Textilbeton ist ein Kompositwerkstoff, bestehend aus einer Feinbetonmatrix und einer textilen Bewehrung aus hochfesten Carbon-oder alkaliresistenten Glasfasern. Aufgrund der nicht korrodierenden Bewehrung kann bei Textilbetonbauteilen auf die für Stahlbetonbauteile zum Korrosionsschutz erforderliche Mindestbetondeckung verzichtet werden. Dadurch ist es möglich, für Betontragwerke bisher ungeahnt leichte Tragstrukturen zu realisieren [1, 2]. Das weite Anwendungsspektrum von Textilbeton erstreckt sich dabei von dünnwandigen Fassadenplatten [3, 4] über Deckschichten von Sandwichelementen [5] bis hin zu schlanken Fußgängerbrücken [6, 7]. Darüber hinaus lassen sich mit Textilbeton typische Stahlbetonkonstruktionen wie Platten und Balken [8-12], Schalen [13, 14] und Stützen [15] effektiv verstärken. Aufgrund seiner flächigen, flexiblen Bewehrung ermöglicht Textilbeton zudem die einfache Herstellung von gekrümmten Bauteilgeometrien, wie ein Schalentragwerk aus vier Hyparschalen an der RWTH Aachen demonstriert [16]. Ziel des im vorliegenden Beitrag beschriebenen Forschungsprojekts war die Entwicklung einer Herstellungsmethodik für einfach gekrümmte Textilbeton-Dachschalen [17] in einem automatisierten und qualitätsgesicherten Produktionsprozess. Die Herstellung der dünnwandigen Fertigteile unterscheidet sich hierbei z. T. stark von den üblichen Herstellungsverfahren konventioneller Stahlbetonbauteile und erfordert innovative und materialspezifische Lösungsansätze. Die Anwendbarkeit derLight-weight precast shell elements made...

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Influence of experimental setups on the apparent uniaxial tensile load-bearing capacity of Textile Reinforced Concrete specimens

Cited by 95 publications

References 15 publications

Thin‐walled shell structures made of textile‐reinforced concrete

Thin‐walled shell structures made of textile‐reinforced concrete

Erratum to: Textile Reinforced Concrete: experimental investigation on design parameters

Leichte Dachschalen aus Carbonbeton

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