Aktive Verbinder für Bauelemente aus Carbonbeton

Ayoubi, Mazen; Sobotta, S.; Schlüter, Dominik; Michler, Harald; Kropp, Thomas; Thüsing, Kai; Kallnick, Stefanie; Schumann, Alexander

doi:10.1002/bate.202000088

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…What is major to mention is that the commercially available anchor channels of type JOR-DAHL JMK28/15 22 achieve significantly lower pull-out forces than the other anchor channels. FEM simulations in previous studies, 29,30 showed large deformations in form of active length (cf. Figure 3b) elongation of the JORDAHL JMK28/15 (cf.…”

Section: Tensile Behaviormentioning

confidence: 86%

Iron‐based shape memory alloy active assembly connectors for civil structures

Thüsing

Sobotta²,

Schlüter

et al. 2023

Structural Concrete

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The lack of suitable connectors for thin‐walled carbon concrete elements with their known resource and material saving properties still represents a major obstacle for practical application. On top, the on‐site installation remains a labor‐intensive task. To overcome this limitation, we report the development of an active assembly connector that enables simple and safe installation of carbon concrete façade elements and increases assembly efficiency. Moreover, the active assembly features permit an assembly without physical access to the connector, called blind assembly. Its concept is based on the recovery expansion of iron‐based shape memory alloys (Fe‐SMA). This paper presents material characteristics such as recovery stress and strain of the Fe‐SMA in compression. The connector concept uses an anchor rail that blocks the recovery extraction of a Fe‐SMA‐fastener to produce a stable, frictional and linear connection. Tensile tests show the impact of design parameters and high pull‐out forces with sufficient design. Also, ongoing long term tensile tests show small creep, so far. The anchor channels integrate well with carbon concrete façade panels. The heating concept with heating cartridges works well, even under cold winter conditions. Wind test results exceed requirements. Finally, a field test shows excellent installation results and proves the ease of assembly as well as the ability for blind assembly.

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Section: Tensile Behaviormentioning

confidence: 86%

Iron‐based shape memory alloy active assembly connectors for civil structures

Thüsing

Sobotta²,

Schlüter

et al. 2023

Structural Concrete

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“…There are existing anchoring systems such as the HALFEN-FPA-5-SL30, which are designed for thin-walled CRC elements. Newly developed concepts are based on shape memory alloy allowing for a blind and non-mechanical assembling [42].…”

Section: Crc Structural Systemsmentioning

confidence: 99%

Advanced Carbon Reinforced Concrete Technologies for Façade Elements of Nearly Zero-Energy Buildings

et al. 2022

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The building sector accounts for approx. 40% of total energy consumption and approx. 36% of all greenhouse gas emissions in Europe. As the EU climate targets for 2030 call for a reduction of greenhouse gas emissions by more than half compared to the emissions of 1990 and also aim for climate neutrality by 2050, there is an urgent need to achieve a significant decrease in the energy use in buildings towards Nearly Zero-Energy Buildings (nZEBs). As the energy footprint of buildings includes the energy and greenhouse gas consumption both in the construction phase and during service life, nZEB solutions have to provide energy-efficient and less carbon-intensive building materials, specific thermal insulation solutions, and a corresponding design of the nZEB. Carbon reinforced concrete (CRC) materials have proven to be excellent candidate materials for concrete-based nZEBs since they are characterized by a significantly lower CO2 consumption during component production and much a longer lifecycle. The corresponding CRC technology has been successively implemented in the last two decades and first pure CRC-based buildings are currently being built. This article presents a novel material system that combines CRC technology and suitable multifunctional insulation materials as a sandwich system in order to meet future nZEB requirements. Because of its importance for the life cycle stage of production, cost-efficient carbon fibers (CF) from renewable resources like lignin are used as reinforcing material, and reinforcement systems based on such CF are developed. Cutting edge approaches to produce ultra-thin lightweight CF reinforced concrete panels are discussed with regard to their nZEB relevance. For the life cycle stage of the utilization phase, the thermal insulation properties of core materials are optimized. In this context, novel sandwich composites with thin CRC layers and a cellular lightweight concrete core are proposed as a promising solution for façade elements as the sandwich core can additionally be combined with an aerogel-based insulation. The concepts to realize such sandwich façade elements will be described here along with a fully automated manufacturing process to produce such structures. The findings of this study provide clear evidence on the promising capabilities of the CRC technology for nZEBs on the one hand and on the necessity for further research on optimizing the energy footprint of CRC-based structural elements on the other hand.

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Aktive Verbinder für Bauelemente aus Carbonbeton

Cited by 2 publications

References 15 publications

Iron‐based shape memory alloy active assembly connectors for civil structures

Iron‐based shape memory alloy active assembly connectors for civil structures

Advanced Carbon Reinforced Concrete Technologies for Façade Elements of Nearly Zero-Energy Buildings

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