Fatigue of glued-in rods in engineered hardwood products — part I: experimental results

Myslicki, Sebastian; Bletz‐Mühldorfer, Oliver; Diehl, Friedemann; Lavarec, C.; Vallée, Till; Scholz, Ronja; Walther, Frank

doi:10.1080/00218464.2018.1555477

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…The existing test methods for the fatigue testing of bonded joints, such as for glued-in rods when following EN 17334 [10], are not suited to evaluate and potentially classify the fatigue performance of the adhesive itself and the bond line strength. Instead, the steel member is often the element governing the fatigue resistance of the joint [11].…”

Section: Fatigue Design In Eurocodementioning

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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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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Section: Fatigue Design In Eurocodementioning

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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“…Hierzu fasst eine Reihe von Übersichtsartikeln [7, 10–12] den aktuellen Konsens über den Stand der Technik zusammen. In diesen Studien werden neben der Berücksichtigung von Laborbedingungen auch Aspekte wie das Verhalten unter Temperatur [13, 14], Ermüdung [15–18], Kriechen [19], verschiedene Umweltbedingungen [20] oder Defekte [21–23] untersucht.…”

Section: Stand Der Technikunclassified

Einkleben von Gewindestangen in Laubholz bei niedrigen Temperaturen

et al. 2020

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Eingeklebte Gewindestangen sind ein aus dem Holzbau nicht mehr wegzudenkender Anschlusstyp. Aktuell werden hierzu 2K‐Epoxide (EPX) und Polyurethane (PUR) verwendet. Diese haben jedoch zwei wesentliche Nachteile: Der Prozess der Aushärtung erstreckt sich, je nach Klebstoffsystem, über mehrere h bis hin zu 10 d. Zum anderen benötigen die zugelassenen Klebstoffe eine Mindestaushärtetemperatur von 18 °C. Beide Nachteile behindern den Einsatz geklebter Gewindestangen, insbesondere auf der Baustelle. In diesem Beitrag werden Untersuchungen zur Bewertung der Schnellhärtbarkeit von 2K‐EPX und 2K‐PUR im Holzbau vorgestellt. In den bisherigen Untersuchungen konnte eine generelle Machbarkeit der Schnellhärtung mittels Induktion im Bereich eingeklebte Gewindestangen im Holzbau unter Normklima (+23 °C, 50 % rel. LF) nachgewiesen werden. Diese Arbeit stellt Ergebnisse zur Schnellhärtbarkeit im Niedrigtemperaturbereich (+5 °C und –10 °C) vor und vergleicht die Ergebnisse mit Referenzproben, die bei +23 °C Raumtemperatur geklebt und ausgehärtet wurden. Die Ergebnisse zeigen, dass vor allem 2K‐EPX auch unter niedrigen Temperaturen schnell ausgehärtet werden können, jedoch gleichzeitig, welchen Einfluss die Schnellhärtung auf die Festigkeit des geklebten Verbunds ausübt.

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“…In a research paper by Bengtsson and Johansson [23], structural applications of steel glued-in bars can be found. On the other hand, studies of laminated veneer beams reinforced with FRP and steel under different forms were shown in [24][25][26][27][28]. For example, Harvey and Ansell [24] from the University of Bath found that glass-fiber-reinforced plastic (GFRP) bars could be used as an alternative to steel bars.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the author is currently researching glued laminated timber beams, solid beams, solid beams connected with wedge joints, cross-laminated timber beams, I-beams also with laminated veneer lumber, laminated veneer lumber beams reinforced with FRP materials, and steel in various forms and sizes and with different characteristics and structures, including in the form of rods made of various artificial fibers and natural fibers under cyclic load. In a study [28], it was found that low-cycle fatigue (LCF) resulted in wood and glue fracture, while rod failure was the limiting factor in high-cycle fatigue (HCF). Gentile et al [29] investigated reinforced wooden beams with GFRP bars using the NSM technique.…”

Section: Introductionmentioning

confidence: 99%

Application of Composite Bars in Wooden, Full-Scale, Innovative Engineering Products—Experimental and Numerical Study

Wdowiak-Postulak,

Świt,

Dziedzic-Jagocka

2024

Materials

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The commercialization of modular timber products as cost-effective and lightweight components has resulted in innovative engineering products, e.g., glued laminated timber, laminated veneer lumber, I-beams, cross-laminated timber and solid timber joined with wedge joints. With the passage of time, timber structures can deteriorate, or new structural elements are required to increase the stiffness or load-bearing capacity in newly built structures, e.g., lintels over large-scale glazing or garages, or to reduce cross-sectional dimensions or save costly timber material while still achieving low weight. It is in such cases that repair or correct reinforcement is required. In this experimental and numerical study, the static performance of flexural timber beams reinforced with prestressed basalt BFRP, glass GFRP and hybrid glass–basalt fiber bars is shown. The experimental tests resulted in an increase in the load-carrying capacity of BFRP (44%), GFRP (33%) and hybrid bars (43%) and an increase in the stiffness of BFRP (28%), GFRP (24%) and hybrid bars (25%). In addition to this, glued laminated timber beams reinforced with prestressed basalt rods subjected to biological degradation, 7 years of weathering and prolonged exposure to various environmental conditions were examined, and an increase in the load-bearing capacity of 27% and an increase in stiffness of 28% were obtained. In addition, full-size laminated timber beams reinforced with prestressed basalt bars were investigated in the field as an exploratory test under fire conditions at elevated temperatures, and the effect of the physical–mechanical properties during the fire was examined via an analysis of these properties after the fire. In addition, a satisfactory correlation of the numerical simulations with the experimental studies was obtained. The differences were between 1.1% and 5.5%. The concordance was due to the fact that, in this study, the Young, Poisson and shear moduli were determined for all quality classes of sawn timber. Only a significant difference resulted in the numerical analysis for the beams exposed to fire under fire conditions. The experimental, theoretical and numerical analyses in this research were exploratory and will be expanded as directions for future research.

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Fatigue of glued-in rods in engineered hardwood products — part I: experimental results

Cited by 9 publications

References 36 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

Einkleben von Gewindestangen in Laubholz bei niedrigen Temperaturen

Application of Composite Bars in Wooden, Full-Scale, Innovative Engineering Products—Experimental and Numerical Study

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