Post‐installed mechanical fasteners in high strength and ultra‐high strength performance concrete

Schwenn, Michael; Voit, Klaus; Zeman, Oliver; Bergmeister, Konrad

doi:10.1002/cend.201900015

Cited by 12 publications

(12 citation statements)

References 8 publications

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“…The structural integrity of the joint is determined by several factors including applied force (value and type), water content, type of concrete, and its tendency to carbonation [18][19][20][21]. In recent years, many researchers have undertaken an effort to investigate the strength of such joints in terms of other operating conditions, e.g., cracked substrate or additional loads [22][23][24][25][26]. Giresini et al [27] focused on the issue of experimental pull-out tests and design indications for strength anchors and proposed the uniform stress model to predict pull-out strength values of installed anchors.…”

Section: Introductionmentioning

confidence: 99%

Effect Steel Fibre Content on the Load-Carrying Capacity of Fibre-Reinforced Concrete Expansion Anchor

2021

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The article presents the pull-out strength tests carried out on M10 expansion anchors in non-cracked and cracked concrete with a crack width cw = 0.30 mm. The breaking loads and the average pull-out strength of anchors in fibre-reinforced concrete substrates were determined. Fibre content ratios of 15, 30 and 50 kg/m3 were used. In addition, two different classes of concrete (C20/25 and C50/60) were tested. The addition of steel fibres caused a decrease in the pull-out strength by 5% for non-cracked concrete of C20/25 class and fibre content up to 30 kg/m3 and a further 7% for the remaining specified dosage. While for concrete of the C50/60 class, it a decrease in the pull-out strength of up to 20% was observed. For cracked concrete class C20/25 with crack initiation cw = 0.30 mm, the reduction was from 9% to 16% in relation to non-cracked concrete and a maximum of 18% for the fibre content of 50 kg/m3. The difference between the tensile load capacity of C50/60 class cracked and non-cracked concrete was lower than 5% and fell within the measurement error.

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Section: Introductionmentioning

confidence: 99%

Effect Steel Fibre Content on the Load-Carrying Capacity of Fibre-Reinforced Concrete Expansion Anchor

2021

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“…Further detailed information on the visualisation method is provided in [13]. 1) Detailed information to the used concrete is provided in [10]; 2) detailed information to the used concrete is provided in [11].…”

Section: Visualisation Methodsmentioning

confidence: 99%

“…The most important information about the concrete specifications is listed in Table 2, which is provided according to the manufacturer's specifications [9] resp. [10,11]. Hollow drilling consists of hammer drilling (usually 2-cutting edge drill or 4-cutting edge drill) with a different drill hole cleaning.…”

Section: Concrete Strength Classesmentioning

confidence: 99%

“…The most important information about the concrete specifications is listed in Table 2, which is provided according to the manufacturer's specifications [9] resp. [10,11]. Recycling concrete 2092 34.1 CEM II 42.5 N, GK32 aggregates made of tunnel excavation material 2)…”

Section: Concrete Strength Classesmentioning

confidence: 99%

“…1) Detailed information to the used concrete is provided in [10]; 2) detailed information to the used concrete is provided in [11].…”

Section: Concrete Strength Classesmentioning

confidence: 99%

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Statistical Evaluation of the Perpendicularity of Boreholes in Concrete for Post-Installed Fasteners

et al. 2020

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The form and the perpendicularity of boreholes influence the ultimate behaviour of post-installed fasteners and are restricted with regard to the concrete surface to 5° in Europe and to 6° in the United States in various regulations (e.g., EAD 330232-00-0601 resp. ACI 355.2-19). It is assumed that the deviation of the borehole from the vertical axis has an effect on the load transfer behaviour of an anchorage. This article investigates on the perpendicularity of vertically downward drilled boreholes using different drilling tools considering hammer drilling, hollow drilling and diamond core drilling. It can be shown that the requirements of e.g., EAD 330232-00-0601 of a maximum deviation to the concrete surface of 5° can be fulfilled for approximately 95% of the determined values for different drilling methods. This is based on a considerable number of measurements (generated from drilled boreholes) in different concrete types. As a result, a detailed statistical evaluation is provided to describe the borehole perpendicularity by means of statistical methods.

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Einfluss der Stahlfaserbewehrungsarten auf den Betonversagenswiderstand von Befestigungen

Spyridis

Hufelschulte

Mellios

2022

Beton und Stahlbetonbau

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Stahlfaserbeton (SFB oder SFRC) ist aufgrund seiner vielen Vorteile ein Standardbaustoff für verschiedene Anwendungsbereiche und seine Verwendung scheint weiter zuzunehmen. Dies spiegelt sich neben zahlreichen wissenschaftlichen Veröffentlichungen und Fachkonferenzen auch in den aktuellsten Regelwerken wider, wie z. B. der DAfStb-Richtlinie Stahlfaserbeton und ihrer jüngsten Ergänzung [1], und vor allem in seiner Aufnahme in die nächste Ausgabe des Eurocode 2 [2]. Die Einbringung von Faserbewehrung zielt darauf ab, Zugkräfte über den Riss hinweg zu übertragen. Dies bedeutet, dass Zugspannungen und Rissfortschritt durch die Fasern lokal aufgehalten werden, bis (i) die Faser selbst reißt, (ii) die Faser aus der Betonmatrix herausgezogen wird oder (iii) der Riss sich lediglich in der Matrix zwischen den verteilten Fasern entwickelt. Es ist daher wichtig darauf hinzuweisen, dass dieses Gesamtverhalten von SFB stark von Art, Form, Material, Zugabemenge, Verteilung, Orientierung und Verbundeigenschaften der Faser in Verbindung mit der Zusammensetzung der Matrix beeinflusst wird (vgl. auch [3-5]). Aufgrund der Vielzahl an Einflussfaktoren wird die Faserwirkung in der jeweiligen Matrix üblicherweise als Zugfestigkeit sowie als Nachrissfestigkeit (z. B. beschrieben durch sogenannte Leistungsklassen) bezeichnet und versuchstechnisch bestimmt [3,5].

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Post‐installed mechanical fasteners in high strength and ultra‐high strength performance concrete

Cited by 12 publications

References 8 publications

Effect Steel Fibre Content on the Load-Carrying Capacity of Fibre-Reinforced Concrete Expansion Anchor

Effect Steel Fibre Content on the Load-Carrying Capacity of Fibre-Reinforced Concrete Expansion Anchor

Statistical Evaluation of the Perpendicularity of Boreholes in Concrete for Post-Installed Fasteners

Einfluss der Stahlfaserbewehrungsarten auf den Betonversagenswiderstand von Befestigungen

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