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Time-variant reliability of timber beams according to Eurocodes considering long-term deflections

Honfi, Dániel LU (2019) In Wood Material Science and Engineering
Abstract

In order to achieve a consistent level of failure probability, structural design codes are optimized using probabilistic methods. This optimization process traditionally focuses on the ultimate limit states (ULS). However, in the design of timber structures the performance of the structural members is often governed by the serviceability limit state (SLS) associated with different load levels than applied in the ULS. The probability of serviceability failure is strongly dependent on the loading sequence and the time-dependent response of timber; therefore, a time-variant probabilistic model is recommended to estimate them properly. This study aims to investigate the time-dependent reliability for long-term deflections of timber office... (More)

In order to achieve a consistent level of failure probability, structural design codes are optimized using probabilistic methods. This optimization process traditionally focuses on the ultimate limit states (ULS). However, in the design of timber structures the performance of the structural members is often governed by the serviceability limit state (SLS) associated with different load levels than applied in the ULS. The probability of serviceability failure is strongly dependent on the loading sequence and the time-dependent response of timber; therefore, a time-variant probabilistic model is recommended to estimate them properly. This study aims to investigate the time-dependent reliability for long-term deflections of timber office and residential floor beams according to the specifications of the Eurocodes. A simple creep model is used to calculate the deflections and Monte Carlo simulation is carried out to determine the reliability index. It was found that the creep factor and the suggested deflection limits given in Eurocode 5 might not be appropriate to achieve the expected target reliabilities. To obtain a more consistent reliability, more suitable values for the mentioned parameters were suggested. However, the primary aim was to present a framework to determine appropriate deflection limits for structural codes.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
creep, deflections, Serviceability, structural reliability
in
Wood Material Science and Engineering
publisher
Taylor & Francis
external identifiers
  • scopus:85062368773
ISSN
1748-0272
DOI
10.1080/17480272.2019.1581254
language
English
LU publication?
yes
id
de997b76-6abd-4116-a3cb-e68c075f6c8c
date added to LUP
2019-03-14 11:07:26
date last changed
2019-04-10 04:20:56
@article{de997b76-6abd-4116-a3cb-e68c075f6c8c,
  abstract     = {<p>In order to achieve a consistent level of failure probability, structural design codes are optimized using probabilistic methods. This optimization process traditionally focuses on the ultimate limit states (ULS). However, in the design of timber structures the performance of the structural members is often governed by the serviceability limit state (SLS) associated with different load levels than applied in the ULS. The probability of serviceability failure is strongly dependent on the loading sequence and the time-dependent response of timber; therefore, a time-variant probabilistic model is recommended to estimate them properly. This study aims to investigate the time-dependent reliability for long-term deflections of timber office and residential floor beams according to the specifications of the Eurocodes. A simple creep model is used to calculate the deflections and Monte Carlo simulation is carried out to determine the reliability index. It was found that the creep factor and the suggested deflection limits given in Eurocode 5 might not be appropriate to achieve the expected target reliabilities. To obtain a more consistent reliability, more suitable values for the mentioned parameters were suggested. However, the primary aim was to present a framework to determine appropriate deflection limits for structural codes.</p>},
  author       = {Honfi, Dániel},
  issn         = {1748-0272},
  keyword      = {creep,deflections,Serviceability,structural reliability},
  language     = {eng},
  month        = {02},
  publisher    = {Taylor & Francis},
  series       = {Wood Material Science and Engineering},
  title        = {Time-variant reliability of timber beams according to Eurocodes considering long-term deflections},
  url          = {http://dx.doi.org/10.1080/17480272.2019.1581254},
  year         = {2019},
}