Advanced

Effective stiffness prediction of GLT beams based on stiffness distributions of individual lamellas

Kandler, Georg; Füssl, Josef; Serrano, Erik LU and Eberhardsteiner, Josef (2015) In Wood Science and Technology
Abstract
The mechanical properties of structural timber—particularly in terms of stiffness and strength—are subject to high variability, which also affects the properties of timber products made from structural timber, e.g., glued laminated timber (GLT). In this paper, the influence of the longitudinal stiffness variability of wooden lamellas on the effective stiffness of GLT is investigated. In a first step, the local fiber orientation on the surfaces of 350 lamellas of Norway spruce was determined by an optical scanning device. This fiber angle information in combination with a micromechanical model for wood was used for the generation of a longitudinal stiffness profile of each lamella. Recording the position and orientation of each lamella, a... (More)
The mechanical properties of structural timber—particularly in terms of stiffness and strength—are subject to high variability, which also affects the properties of timber products made from structural timber, e.g., glued laminated timber (GLT). In this paper, the influence of the longitudinal stiffness variability of wooden lamellas on the effective stiffness of GLT is investigated. In a first step, the local fiber orientation on the surfaces of 350 lamellas of Norway spruce was determined by an optical scanning device. This fiber angle information in combination with a micromechanical model for wood was used for the generation of a longitudinal stiffness profile of each lamella. Recording the position and orientation of each lamella, a total number of 50 GLT beams were assembled (with 4, 7, and 10 laminations) and tested under four-point bending. Knowing the stiffness profile of each board and its location within the GLT beam allowed for an accurate numerical finite element model, which is able to predict the effective GLT stiffness with high accuracy. Interesting insights into the relation between the stiffness of lamellas and the resulting GLT beams could be gained, and finally, a numerical simulation tool which is able to reproduce the experimental results appropriately was obtained. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Wood Science and Technology
publisher
Springer
external identifiers
  • scopus:84944352142
ISSN
1432-5225
DOI
10.1007/s00226-015-0745-5
language
English
LU publication?
yes
id
d293da80-05e9-4b14-93e5-2f92b2740cce (old id 7762039)
date added to LUP
2015-08-17 11:09:09
date last changed
2017-10-22 04:21:36
@article{d293da80-05e9-4b14-93e5-2f92b2740cce,
  abstract     = {The mechanical properties of structural timber—particularly in terms of stiffness and strength—are subject to high variability, which also affects the properties of timber products made from structural timber, e.g., glued laminated timber (GLT). In this paper, the influence of the longitudinal stiffness variability of wooden lamellas on the effective stiffness of GLT is investigated. In a first step, the local fiber orientation on the surfaces of 350 lamellas of Norway spruce was determined by an optical scanning device. This fiber angle information in combination with a micromechanical model for wood was used for the generation of a longitudinal stiffness profile of each lamella. Recording the position and orientation of each lamella, a total number of 50 GLT beams were assembled (with 4, 7, and 10 laminations) and tested under four-point bending. Knowing the stiffness profile of each board and its location within the GLT beam allowed for an accurate numerical finite element model, which is able to predict the effective GLT stiffness with high accuracy. Interesting insights into the relation between the stiffness of lamellas and the resulting GLT beams could be gained, and finally, a numerical simulation tool which is able to reproduce the experimental results appropriately was obtained.},
  author       = {Kandler, Georg and Füssl, Josef and Serrano, Erik and Eberhardsteiner, Josef},
  issn         = {1432-5225},
  language     = {eng},
  month        = {07},
  publisher    = {Springer},
  series       = {Wood Science and Technology},
  title        = {Effective stiffness prediction of GLT beams based on stiffness distributions of individual lamellas},
  url          = {http://dx.doi.org/10.1007/s00226-015-0745-5},
  year         = {2015},
}