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An experimental study of the effects of moisture variations and gradients in the joint area in steel-timber dowel joints

Sjödin, Johan and Serrano, Erik LU (2008) In Holzforschung 62(2). p.243-247
Abstract
<p>This experimental study examines the influence of moisture variations on the load-bearing capacity of steeltimber dowel joints. The glulam specimens used to manufacture the joints were first exposed to controlled climate changes. After being stored in the climate chambers, holes were drilled and dowels were inserted. Then, the joints were loaded to failure. The main aim of this study was to investigate how and to what extent moisture variations and gradients in the joint area affects the load-bearing capacity in tension parallel to the grain. The load-bearing capacity was found to be reduced under these conditions when compared to reference joints. Moreover, the brittleness of the joints increased with the time the joints had been... (More)
<p>This experimental study examines the influence of moisture variations on the load-bearing capacity of steeltimber dowel joints. The glulam specimens used to manufacture the joints were first exposed to controlled climate changes. After being stored in the climate chambers, holes were drilled and dowels were inserted. Then, the joints were loaded to failure. The main aim of this study was to investigate how and to what extent moisture variations and gradients in the joint area affects the load-bearing capacity in tension parallel to the grain. The load-bearing capacity was found to be reduced under these conditions when compared to reference joints. Moreover, the brittleness of the joints increased with the time the joints had been exposed to drying. Moistureinduced stresses and cracks in the joint area were found to be a possible explanation of the results. A similar interpretation was given in other studies where other structural timber elements have been studied. This raises an important question of how such moisture effects should be considered in design codes. One possibility is to include the influence of moisture-induced stresses in the k_mod factor used in Eurocode 5. Another way could be to consider this type of moisture effect as an equivalent mechanical load case.</p> (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
glulam structures, moisture gradients, moisture induced stresses, moisture variations, steel-timber dowel joints
in
Holzforschung
volume
62
issue
2
pages
243 - 247
publisher
De Gruyter
external identifiers
  • scopus:38849146281
ISSN
1437-434X
DOI
10.1515/HF.2008.020
language
English
LU publication?
no
id
13e7c27d-4f8b-44f5-b3e8-9904ce80035e (old id 4770423)
date added to LUP
2014-11-07 13:53:35
date last changed
2017-07-30 03:50:54
@article{13e7c27d-4f8b-44f5-b3e8-9904ce80035e,
  abstract     = {&lt;p&gt;This experimental study examines the influence of moisture variations on the load-bearing capacity of steeltimber dowel joints. The glulam specimens used to manufacture the joints were first exposed to controlled climate changes. After being stored in the climate chambers, holes were drilled and dowels were inserted. Then, the joints were loaded to failure. The main aim of this study was to investigate how and to what extent moisture variations and gradients in the joint area affects the load-bearing capacity in tension parallel to the grain. The load-bearing capacity was found to be reduced under these conditions when compared to reference joints. Moreover, the brittleness of the joints increased with the time the joints had been exposed to drying. Moistureinduced stresses and cracks in the joint area were found to be a possible explanation of the results. A similar interpretation was given in other studies where other structural timber elements have been studied. This raises an important question of how such moisture effects should be considered in design codes. One possibility is to include the influence of moisture-induced stresses in the k_mod factor used in Eurocode 5. Another way could be to consider this type of moisture effect as an equivalent mechanical load case.&lt;/p&gt;},
  author       = {Sjödin, Johan and Serrano, Erik},
  issn         = {1437-434X},
  keyword      = {glulam structures,moisture gradients,moisture induced stresses,moisture variations,steel-timber dowel joints},
  language     = {eng},
  number       = {2},
  pages        = {243--247},
  publisher    = {De Gruyter},
  series       = {Holzforschung},
  title        = {An experimental study of the effects of moisture variations and gradients in the joint area in steel-timber dowel joints},
  url          = {http://dx.doi.org/10.1515/HF.2008.020},
  volume       = {62},
  year         = {2008},
}