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Length effect of structural timber

Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert (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 two-point load, but with different speed for the load applied. (Less)
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author
Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
report number
TVBK-5108
ISSN
0349-4969
language
English
id
3172233
date added to LUP
2012-12-04 14:22:14
date last changed
2014-06-10 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 two-point load, but with different speed for the load applied.},
  author       = {Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert},
  issn         = {0349-4969},
  language     = {eng},
  note         = {Student Paper},
  title        = {Length effect of structural timber},
  year         = {2001},
}