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

Jockwer, Robert; Landel, Pierre; Norbäck, Viktor; Ziethén, Rune; Dölerud, Erik; Naveda, Leo Anderson; Åkerström, Carl-Johan

doi:10.52202/069179-0281

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…On the other side of the plate, there were two pairs of holes of diameter 5 and 13 mm. These holes were not used in the compression tests and are meant for another series of tests where the fatigue strength of the hybrid joints is investigated [8]. The perforated steel plate and its holes were cut with a laser cutter with a tolerance of 0.03 mm.…”

Section: Tested Materialsmentioning

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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Section: Tested Materialsmentioning

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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Bonding strength between spruce glulam and birch plywood at different load-to-plywood face grain angles

Wang,

Debertolis

et al. 2024

Eur. J. Wood Prod.

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There is growing interest recently in reducing the usage of metals in timber structures. Birch plywood possesses satisfactory mechanical properties compared to other wood-based panels and is promising to be utilized in timber connections as a substitute for the more conventional slotted-in metal plate. There are essentially two possibilities to connect plywood plates and other timber elements by means of either mechanical connections or adhesively bonded connections. Despite the more commonly adopted mechanical connections in current timber structures, the adhesively bonded connections hold the distinct advantages of being more cost-effective, stiffer, and with a lower risk of moisture penetration in the timber elements. When employing birch plywood in timber structure applications such as trusses and frame corners, stresses from different directions need to be transmitted by the plywood gusset plate. However, it is still uncertain how the bonding strength is affected by different loading angles to the face grain. This research question, specifically concerning the bonding strength between birch plywood and spruce glulam, has been addressed in this paper. It was found that the bonding strength varies within a relatively small range when the load-to-plywood face grain angle varies from 0° to 90°, which is promising for the development of adhesively bonded joints. Failure mainly occurred in glulam at 0° and 15°; while at other angles, a mixture of cohesive failure in glulam and plywood face veneer was dominant. The weak angle-dependence of the bonding strength can be explained by further checking the shear strength of the weaker wood adherends between glulam and plywood. A strong positive correlation was observed between bonding strength and the wood shear strength.

show abstract

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

Cited by 2 publications

References 7 publications

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

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

Bonding strength between spruce glulam and birch plywood at different load-to-plywood face grain angles

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