Abstract
This paper is the second in a series which sums up the results of an extensive project to quantify the duration-of-load (DOL) effect on different sized timber beams in different climates. The paper deals with straight (unnotched) beams. The results of various DOL-tests of stepwise and constant bending of LVL and glulam beams are reported and results of modelling outlined. It is concluded that in cyclically varying climate large cross-sections are less affected by the DOL-effect than smaller ones. The results do not show marked difference between LVL and glulam in susceptibility to the DOL-effect.
Zusammenfassung
Diese Arbeit ist der zweite einer Artikelreihe über ein ausgedehntes Projekt zur Quantifizierung des DOL-Effektes bei Tägern unterschiedlicher Abmessungen unter dem Einfluß verschiedener Umgebungsbedingungen. Hier werden nicht keilverzinkte Träger untersucht. Die Ergebnisse verschiedener DOL-Tests unter stufenweiser und kontinuierlicherBiegebelastung von LVL- und Glulam-Trägern werden vorgestellt. Ebenso werden Modelier-Ergebnisse beschrieben. Es ergab sich, daß große Querschnitte in zyklischem Wechselklima weniger vom DOL-Effekt betroffen sind als kleine Querschnitte. Die Ergebnisse zeigen keinen besonderen Unterschied zwischen Glulam und LVL bezüglich ihrer Empfindlichkeit gegenüber dem DOL-Effekt.
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The work has been financed by the EC (Project no. AIR2-CT94-1057) and national funding institutes: Technology Development Centre of Finland, The Academy of Finland. The support of these financiers is gratefully acknowledged. Also the appreciation for the financial support of Finnforest Oy is expressed.
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Hanhijärvi, A., Galimard, P. & Hoffmeyer, P. Duration of load behaviour of different sized straight timber beams subjected to bending in variable climate. Holz als Roh- und Werkstoff 56, 285–293 (1998). https://doi.org/10.1007/s001070050321
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DOI: https://doi.org/10.1007/s001070050321