Length effect of structural timber
(2001)Division of Structural Engineering
Civil Engineering (M.Sc.Eng.)
- 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)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/3172233
- author
- Torrens Fonoll, Alexandre and Mercadal Sorinas, Albert
- supervisor
- organization
- year
- 2001
- 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}},
}