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Development of decay performance models for outdoor timber structures

Isaksson, Tord LU ; Brischke, Christian and Thelandersson, Sven LU (2013) In Materials and Structures 46(7). p.1209-1225
Abstract
Performance based building (PBB) and design is closely connected to various needs and requirements: Performance levels need to be defined, test methods for verification of performance need to be developed, and reliable performance data are needed for materials, products, constructions, and different design solutions. In contrast to other building materials, PBB and thus service life prediction of timber and wood-based products requires particular consideration of wood-degrading organisms and their physiological needs. For the most relevant group of wood-destroying organisms, which are the different decay fungi and bacteria, wood moisture content and temperature need to be considered as key factors. This study aimed on the development of... (More)
Performance based building (PBB) and design is closely connected to various needs and requirements: Performance levels need to be defined, test methods for verification of performance need to be developed, and reliable performance data are needed for materials, products, constructions, and different design solutions. In contrast to other building materials, PBB and thus service life prediction of timber and wood-based products requires particular consideration of wood-degrading organisms and their physiological needs. For the most relevant group of wood-destroying organisms, which are the different decay fungi and bacteria, wood moisture content and temperature need to be considered as key factors. This study aimed on the development of performance models on the basis of hard data obtained in field trials performed under most realistic conditions. Dose-response relationships, which can serve as essential parts of a performance based design model, were derived from material climatic data and corresponding decay development in the field. Different dose-response models are proposed and evaluated for predicting onset (and progress) of decay when wood is exposed to a dynamic and arbitrary climate exposure described in terms of time series of coupled temperature and moisture content. A logistic dose-response model was primarily focused on describing the relation between exposure and decay rating for moisture traps with long periods of high moisture contents. A two-step linear engineering model was more focused on predicting the behavior in a wider, more simplified, sense where periods of high moisture content are interrupted by periods of drier and/or colder climate. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Climate, Design guideline, Exposure, Moisture performance, Wood, resistance, Service life prediction
in
Materials and Structures
volume
46
issue
7
pages
1209 - 1225
publisher
Springer
external identifiers
  • wos:000320875700013
  • scopus:84879689956
ISSN
1359-5997
DOI
10.1617/s11527-012-9965-4
language
English
LU publication?
yes
id
04b7a0dc-2910-445c-88da-fb543480e853 (old id 3979722)
date added to LUP
2013-09-03 15:11:22
date last changed
2019-05-14 01:29:02
@article{04b7a0dc-2910-445c-88da-fb543480e853,
  abstract     = {Performance based building (PBB) and design is closely connected to various needs and requirements: Performance levels need to be defined, test methods for verification of performance need to be developed, and reliable performance data are needed for materials, products, constructions, and different design solutions. In contrast to other building materials, PBB and thus service life prediction of timber and wood-based products requires particular consideration of wood-degrading organisms and their physiological needs. For the most relevant group of wood-destroying organisms, which are the different decay fungi and bacteria, wood moisture content and temperature need to be considered as key factors. This study aimed on the development of performance models on the basis of hard data obtained in field trials performed under most realistic conditions. Dose-response relationships, which can serve as essential parts of a performance based design model, were derived from material climatic data and corresponding decay development in the field. Different dose-response models are proposed and evaluated for predicting onset (and progress) of decay when wood is exposed to a dynamic and arbitrary climate exposure described in terms of time series of coupled temperature and moisture content. A logistic dose-response model was primarily focused on describing the relation between exposure and decay rating for moisture traps with long periods of high moisture contents. A two-step linear engineering model was more focused on predicting the behavior in a wider, more simplified, sense where periods of high moisture content are interrupted by periods of drier and/or colder climate.},
  author       = {Isaksson, Tord and Brischke, Christian and Thelandersson, Sven},
  issn         = {1359-5997},
  keyword      = {Climate,Design guideline,Exposure,Moisture performance,Wood,resistance,Service life prediction},
  language     = {eng},
  number       = {7},
  pages        = {1209--1225},
  publisher    = {Springer},
  series       = {Materials and Structures},
  title        = {Development of decay performance models for outdoor timber structures},
  url          = {http://dx.doi.org/10.1617/s11527-012-9965-4},
  volume       = {46},
  year         = {2013},
}