Length effect of structural timber
(2001)Division of Structural Engingeering
Civil Engineering
 Abstract
 The purpose of this thesis is to evaluate the influence of the length effect of Structural timber. With that aim two samples with different length have been tested. Each sample has one hundred beams with the properties of both samples as close as possible.
Engineering design methods for timber assume homogeneous material all
along the beam, but in reality the strength is highly variable along a timber board. That fact implies that the real strength depends on length, load configuration, knots, MC and other factors.
The failure of the beam occurs when the weakest seetian of the beam fails.
The probability that a weak seetian is located within the beam increases with increasing length.
First was found the weakest seetian for each board... (More)  The purpose of this thesis is to evaluate the influence of the length effect of Structural timber. With that aim two samples with different length have been tested. Each sample has one hundred beams with the properties of both samples as close as possible.
Engineering design methods for timber assume homogeneous material all
along the beam, but in reality the strength is highly variable along a timber board. That fact implies that the real strength depends on length, load configuration, knots, MC and other factors.
The failure of the beam occurs when the weakest seetian of the beam fails.
The probability that a weak seetian is located within the beam increases with increasing length.
First was found the weakest seetian for each board to be tested for bending
strength. The grading system that was used is visual registration of knots.
The Modulus of Elasticity, MOE, of each beam was found with a nondestructive
test, then each beam was reloaded until failure. Two hundred
boards of Norway Spruce, grown in Southern Sweden, were tested according
to the European standard, EN 338 standard.
The bending strength for two different lengths, 4 m and 2 m, were tested to
see the influence of the length in bending strength. Both lengths were loaded with the same moment configuration of twopoint load, but with different speed for the load applied. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/studentpapers/record/3172233
 author
 Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert
 supervisor

 Tord Isaksson ^{LU}
 organization
 year
 2001
 type
 H3  Professional qualifications (4 Years  )
 subject
 report number
 TVBK5108
 ISSN
 03494969
 language
 English
 id
 3172233
 date added to LUP
 20121204 14:22:14
 date last changed
 20140610 16:26:18
@misc{3172233, abstract = {The purpose of this thesis is to evaluate the influence of the length effect of Structural timber. With that aim two samples with different length have been tested. Each sample has one hundred beams with the properties of both samples as close as possible. Engineering design methods for timber assume homogeneous material all along the beam, but in reality the strength is highly variable along a timber board. That fact implies that the real strength depends on length, load configuration, knots, MC and other factors. The failure of the beam occurs when the weakest seetian of the beam fails. The probability that a weak seetian is located within the beam increases with increasing length. First was found the weakest seetian for each board to be tested for bending strength. The grading system that was used is visual registration of knots. The Modulus of Elasticity, MOE, of each beam was found with a nondestructive test, then each beam was reloaded until failure. Two hundred boards of Norway Spruce, grown in Southern Sweden, were tested according to the European standard, EN 338 standard. The bending strength for two different lengths, 4 m and 2 m, were tested to see the influence of the length in bending strength. Both lengths were loaded with the same moment configuration of twopoint load, but with different speed for the load applied.}, author = {Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert}, issn = {03494969}, language = {eng}, note = {Student Paper}, title = {Length effect of structural timber}, year = {2001}, }