Fatigue Performance of Adhesive Connections for Wooden Wind Towers

Bathon, Leander; Bletz‐Mühldorfer, Oliver; Schmidt, J.; Diehl, Friedemann

doi:10.1007/978-94-007-7811-5_34

Cited by 9 publications

(6 citation statements)

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“…Butt-joints with bonded-in perforated high-strength steel plates are developed for the wooden wind turbine towers by Modvion. These joints are similar to other existing solutions [2].…”

Section: Introduction 8910supporting

confidence: 78%

“…The hybrid timber joint is an adhesive connection using a thin perforated steel plate to join two timber members. It is similar to other bonded connections between steel and timber such as glued-in rods for glued structural timber products or the connection system described in [2]. In Modvion's application, a thick steel plate with a large amount of holes are inserted in slots in the LVL members.…”

Section: The Hybrid Timber Joint (Set)mentioning

confidence: 99%

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Fatigue Resistance of Adhesive Bonded Connections With and Without Internal Steel Plates in Large Timber Structures

Jockwer

Landel

Norbäck

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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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.

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“…Butt-joints with bonded-in perforated high-strength steel plates are developed for the wooden wind turbine towers by Modvion. These joints are similar to other existing solutions [2].…”

Section: Introduction 8910supporting

confidence: 78%

Section: The Hybrid Timber Joint (Set)mentioning

confidence: 99%

Fatigue Resistance of Adhesive Bonded Connections With and Without Internal Steel Plates in Large Timber Structures

Jockwer

Landel

Norbäck

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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show abstract

“…The proprietary Holz-Stahl-Komposit (HSK) system [36], originally developed for Glulam member connections, was modified in its layout for use as HD for CLT shear walls [37]. The HSK system is based on adhesively bonded perforated steel plates, inserted inside precut slots in the mass timber panels.…”

Section: Holz-stahl-komposit Systemmentioning

confidence: 99%

Contemporary and Novel Hold-Down Solutions for Mass Timber Shear Walls

Tannert

Loss

2022

Buildings

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‘Mass timber’ engineered wood products in general, and cross-laminated timber in particular, are gaining popularity in residential, non-residential, as well as mid- and high-rise structural applications. These applications include lateral force-resisting systems, such as shear walls. The prospect of building larger and taller timber buildings creates structural design challenges; one of them being that lateral forces from wind and earthquakes are larger and create higher demands on the ‘hold-downs’ in shear wall buildings. These demands are multiple: strength to resist loads, lateral stiffness to minimize deflections and damage, as well as deformation compatibility to accommodate the desired system rocking behaviour during an earthquake. In this paper, contemporary and novel hold-down solutions for mass timber shear walls are presented and discussed, including recent research on internal-perforated steel plates fastened with self-drilling dowels, hyperelastic rubber pads with steel rods, and high-strength hold-downs with self-tapping screws.

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“…This hybrid type of glued-in plate joints has been used in different timber building applications to elegantly assemble CLT, LVL, and GLT elements. Research and development works have been performed in central Europe [3] and in Germany, where the commercial and certified HSK-system from the company TiComTec is available [4]. This technology is similar to glued-in rods in glued structural timber products, which adhesively bond steel rods and timber members.…”

Section: Introduction 567mentioning

confidence: 99%

On-Site Gluing and Weather Effects on Tall Wooden Wind Turbine Towers

Norbäck

Landel

Dölerud³

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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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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Fatigue Performance of Adhesive Connections for Wooden Wind Towers

Cited by 9 publications

References 0 publications

Fatigue Resistance of Adhesive Bonded Connections With and Without Internal Steel Plates in Large Timber Structures

Fatigue Resistance of Adhesive Bonded Connections With and Without Internal Steel Plates in Large Timber Structures

Contemporary and Novel Hold-Down Solutions for Mass Timber Shear Walls

On-Site Gluing and Weather Effects on Tall Wooden Wind Turbine Towers

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