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Crosslam - Today's use and implementation of new wood species

Stolt, Axel LU and Reluskovski, Dejan LU (2018) In TVSM-4000 VBVL01 20181
Department of Construction Sciences
Structural Mechanics
Abstract
The building industry in Sweden is dominated by concrete today. However, this material has a greater impact on carbon emissions compared to wood. By examining some of the general properties of wood and specifically cross laminated timber we have explored the basic advantages and disadvantages of this relatively new and mildly used building material, as well as, investigated why it has not developed to be a favored building material in the industry. After reviewing interviews with a manufacturer, a structural engineer, and a contractor, inexperience seems to be the main reason for this. Some properties of the different wood species used in the dissertation has been presented as well as properties of crosslam elements We have also presented... (More)
The building industry in Sweden is dominated by concrete today. However, this material has a greater impact on carbon emissions compared to wood. By examining some of the general properties of wood and specifically cross laminated timber we have explored the basic advantages and disadvantages of this relatively new and mildly used building material, as well as, investigated why it has not developed to be a favored building material in the industry. After reviewing interviews with a manufacturer, a structural engineer, and a contractor, inexperience seems to be the main reason for this. Some properties of the different wood species used in the dissertation has been presented as well as properties of crosslam elements We have also presented how the Gamma-method can be used as a simplification to evaluate stiffness according to Eurocode 5. A parametric study has also been conducted. Seeing that there are other species of wood with a higher rolling shear modulus than spruce it makes sense testing one of those in crosslam elements. From a designing point of view the parametric study shows that it is hardly worth switching to previously unused wood species in crosslam, at least in spans of 4 and 8 m, gaining 14% in moment of inertia at most. As a second part of the dissertation we have tested Poplar, Birch, Hybrid Aspen, and Spruce in regard to mechanical properties. The main objective has been to understand how the rolling shear affects structural design of crosslam elements. The rolling shear strength is often the limiting factor together with the outermost layers ability to withhold traction forces in crosslam. The experiments together with the parametric study is the base of the second part of the dissertation. (Less)
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author
Stolt, Axel LU and Reluskovski, Dejan LU
supervisor
organization
course
VBVL01 20181
year
type
M2 - Bachelor Degree
subject
keywords
Crosslam CLT wood cross laminated timber parametric study poplar birch hybrid aspen spruce rolling shear strength
publication/series
TVSM-4000
report number
TVSM-4001
ISSN
0281-6679
language
English
id
8958015
date added to LUP
2018-10-08 10:50:19
date last changed
2018-10-08 10:50:19
@misc{8958015,
  abstract     = {The building industry in Sweden is dominated by concrete today. However, this material has a greater impact on carbon emissions compared to wood. By examining some of the general properties of wood and specifically cross laminated timber we have explored the basic advantages and disadvantages of this relatively new and mildly used building material, as well as, investigated why it has not developed to be a favored building material in the industry. After reviewing interviews with a manufacturer, a structural engineer, and a contractor, inexperience seems to be the main reason for this. Some properties of the different wood species used in the dissertation has been presented as well as properties of crosslam elements We have also presented how the Gamma-method can be used as a simplification to evaluate stiffness according to Eurocode 5. A parametric study has also been conducted. Seeing that there are other species of wood with a higher rolling shear modulus than spruce it makes sense testing one of those in crosslam elements. From a designing point of view the parametric study shows that it is hardly worth switching to previously unused wood species in crosslam, at least in spans of 4 and 8 m, gaining 14% in moment of inertia at most. As a second part of the dissertation we have tested Poplar, Birch, Hybrid Aspen, and Spruce in regard to mechanical properties. The main objective has been to understand how the rolling shear affects structural design of crosslam elements. The rolling shear strength is often the limiting factor together with the outermost layers ability to withhold traction forces in crosslam. The experiments together with the parametric study is the base of the second part of the dissertation.},
  author       = {Stolt, Axel and Reluskovski, Dejan},
  issn         = {0281-6679},
  keyword      = {Crosslam CLT wood cross laminated timber parametric study poplar birch hybrid aspen spruce rolling shear strength},
  language     = {eng},
  note         = {Student Paper},
  series       = {TVSM-4000},
  title        = {Crosslam - Today's use and implementation of new wood species},
  year         = {2018},
}