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  • 1.
    Jockwer, Robert
    et al.
    Chalmers University of Technology, Sweden.
    Landel, Pierre
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Norbäck, Viktor
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Ziethén, Rune
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Dölerud, Erik
    Modvion AB, Sweden.
    Naveda, Leo Anderson
    Modvion AB, Sweden.
    Åkerström, Carl-Johan
    Modvion AB, Sweden.
    FATIGUE RESISTANCE OF ADHESIVE BONDED CONNECTIONS WITH AND WITHOUT INTERNAL STEEL PLATES IN LARGE TIMBER STRUCTURES2023In: World Conference on Timber Engineering (WCTE 2023), 2023, p. 2118-2124Conference paper (Refereed)
    Abstract [en]

    A modular wooden wind turbine tower has been developed by the Swedish company Modvion AB, where the prefabricated modular elements are connected by glued timber-timber edge joints and by hybrid timber joints with bonded-in perforated steel plates. The application of wood-based products in such a demanding application and highperformance structure is challenging and a variety of questions had to be solved to ensure a reliable performance. The fatigue performance of the adhesive bonded connections has been evaluated in a research project and is presented in this paper. Test specimens of the fatigue resistance of the adhesive and the bond line has been developed. Different stress ratios with alternating loads and high numbers of load cycles have been tested. The results of the tests are presented in this paper.

  • 2.
    Norbäck, Viktor
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Biobaserad Lösullsfyllning – en förstudie2023Report (Other academic)
    Abstract [sv]

    Biobaserad lösullsfyllning används i svenska byggnader idag men inte i industriell skala. Intervjuer och en enkätundersökning har genomförts med industriella tillverkare av trähus och leverantörer av biobaserad isolering med syfte är att utreda varför de industriella tillverkarna inte använder inblåst isolering gjord av biobaserad råvara. Marknaden har skannats av på vilka material som finns tillgängliga och hur vissa av dessa skiljer sig åt med avseende på prestanda och klimatpåverkan. De svenska industriella hustillverkarna är intresserade av materialen då de medför både lägre klimatpåverkan än traditionell isolering och innebär produktionsfördelar. Att ställa om innebär dock risker; ny utrustning behöver köpas in, ett nytt produktionssätt ska trimmas in, ny dokumentation ska framställas och det finns fortfarande en osäkerhet kring materialens prestanda och leverantörernas förmåga att tillgodose de volymer som krävs.

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  • 3.
    Norbäck, Viktor
    et al.
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Landel, Pierre
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Dölerud, Erik
    Modvion AB, Sweden.
    Wickström, Anders
    RISE Research Institutes of Sweden, Safety and Transport, Electrification and Reliability.
    ON-SITE GLUING AND WEATHER EFFECTS ON TALL WOODEN WINDTURBINE TOWERS2023Conference paper (Refereed)
    Abstract [en]

    Modvion develops modular wind turbine towers made of wood. The application requires strong and stiff connections and to achieve the desired performance, a hybrid connection with perforated steel plates slotted into LVL modules is used. The parts will be glued together on site, using a polyurethane adhesive (PUR), providing high strength and stiffness to the connection. This paper presents a preliminary screening on how temperature and relative humidity of the surrounding air during assembly and curing will influence the strength of the bond glued on-site. Static tests were performed on the hybrid connections which were glued and cured in different climates. Tests were also performed at different hardening times to evaluate strength growth in the studied climates. The test results show that at cold temperatures of 9 °C to 12 °C there is a breakpoint where the rate of strength growth starts to decline. The experiments show also that the relative humidity may influence the final strength of the bond. However, the low number of tested specimens brings uncertainties to this observation. High temperatures up to 27 ºC and dry climates down to 20% RH did not impact the strength of the tested hybrid connections.

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    fulltext
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