Joints with bars glued-in softwood laminated timber subjected to climatic cycles

Otero-Chans, Dolores; Estévez-Cimadevila, Javier; Gutiérrez, Emilio Martín

doi:10.1016/j.ijadhadh.2017.12.010

Cited by 18 publications

(5 citation statements)

References 32 publications

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“…Differences between EP (T g ≈ 69 C) and PUR (T g ≈ 86 C) are also reported by Verdet et al, 40 whereby both adhesive types lead to similar, almost linear, decreases in strength in the temperature range 30-70 C. 22 Similar results are also reported by di Maria et al, 41 showing a 50% reduction in load-bearing capacity when T g is exceeded. This effect was also described by Otero-Chans et al 42 However, they found no clear evidence that the strength of the joints tested under normal conditions was affected after exposure to temperatures up to 50 C at a relative humidity φ of more than 80%. Lartigau et al 43 report on tests with bonded bars in the temperature range 20-80 C using an EP (T g = 58 C).…”

Section: Introductionsupporting

confidence: 53%

Threaded rods grouted in beech laminated veneer lumber

Wirries

Tsopjio

Vallée

et al. 2022

Civil Engineering Design

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Glued‐in rods are a class of adhesively bonded joints for timber engineering applications resulting in high‐strength and stiffness connections. However, the use of polymeric adhesives may lead to issues related if the temperatures exceed their glass transition temperature, restricting their performance under quasi‐static, or more critically, sustained loads. To overcome these, the substitution of polymeric adhesives by mineral high‐performance grout was investigated. It was found that primers have neither a significant effect on strength nor on the failure mode; threated wood surfaces, however, resulted in a significant improvement of the latter. Based thereupon, grouted‐in rods were manufactured. The best performance was achieved with a threaded wood surface, which achieved roughly 50% of the strength comparable adhesively bonded glued‐in rod's strength. While the obtained strength may seem quite low, it is important to remind that the latter will largely remain unaffected by temperature; accordingly, made at room temperature, the comparison between grouted and glued rods is in favor of adhesive bonding, it may well be different at elevated ones.

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Section: Introductionsupporting

confidence: 53%

Threaded rods grouted in beech laminated veneer lumber

Wirries

Tsopjio

Vallée

et al. 2022

Civil Engineering Design

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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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“…Similar results were found for the 12 mm dia. threaded steel rods glued into softwood with a two-component epoxy adhesive (HILTI HIT-RE 500) by Otero-Chans et al (2018).…”

Section: Introductionmentioning

confidence: 99%

Pull-Out Performance of Timber Joints with Glued-In Densified Wood Dowels

Jiao

et al. 2023

J. Mater. Civ. Eng.

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Densified wood dowel is worth to be regarded as an alternative rod for the timber joints with glued-in rods, because it is more naturally harmonized with timber members, and has better resistance against corrosion and lower thermal conductivity than steel rod. This paper compared the pull-out performances of the timber joints with glued-in densified wood (DW) dowels and threaded steel rods loaded parallel to the grain in two ambient environments with a temperature of 20C and relative humidity (RH) of 65% corresponding to service class 1 and relative humidity of 85% corresponding to service class 2 according to Eurocode 5. In service class 1, the 2 pull-out capacity of the glued-in DW dowels having an anchorage length of 10 times the dowel diameter was close to 75% of that of the glued-in threaded steel rods. The impact of service environment was found to be greater for the timber joints with glued-in threaded steel rods than the timber joints with glued-in DW dowels.

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Joints with bars glued-in softwood laminated timber subjected to climatic cycles

Cited by 18 publications

References 32 publications

Threaded rods grouted in beech laminated veneer lumber

Threaded rods grouted in beech laminated veneer lumber

Einkleben von Gewindestangen in Laubholz bei niedrigen Temperaturen

Pull-Out Performance of Timber Joints with Glued-In Densified Wood Dowels

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