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Spatial Temperature Differences in Portal Frame Bridges

Gottsäter, Erik LU and Larsson Ivanov, Oskar LU (2019) In Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE)
Abstract
Thermal actions are considered in the design of bridges, as temperature variations can lead to restraint stresses and subsequent cracking. However, load descriptions are in some cases oversimplified or incompatible with modern applications, and background studies are limited. This paper therefore aims to develop a more detailed load description for the load case describing temperature differences between structural parts in bridges, focusing on portal frame bridges. The temperature in portal frame bridges is investigated by performing long-term thermal simulations using weather data from several locations in Sweden, and thereafter performing statistical analyses of the resulting temperature variations over time. The study gives suggestions... (More)
Thermal actions are considered in the design of bridges, as temperature variations can lead to restraint stresses and subsequent cracking. However, load descriptions are in some cases oversimplified or incompatible with modern applications, and background studies are limited. This paper therefore aims to develop a more detailed load description for the load case describing temperature differences between structural parts in bridges, focusing on portal frame bridges. The temperature in portal frame bridges is investigated by performing long-term thermal simulations using weather data from several locations in Sweden, and thereafter performing statistical analyses of the resulting temperature variations over time. The study gives suggestions of both characteristic and quasi-permanent values to be used in design based on the statistical analyses, and also notes a gradual change in temperature between structural parts, which could be considered in the design. The resulting quasi-permanent values are significantly lower than the values given in the Eurocode for temperature differences between structural parts, which, in turn, will lead to smaller and more realistic stress values in bridge design. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
in
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE)
pages
8 pages
publisher
International Association for Bridge and Structural Engineering
ISSN
1683-0350
DOI
10.1080/10168664.2019.1632775
project
Modeling and evaluation of restraint forces in concrete bridges
language
English
LU publication?
yes
id
859de9bf-0e04-4763-bcaf-0d4118491f1c
date added to LUP
2019-09-09 08:56:37
date last changed
2019-09-23 09:04:18
@article{859de9bf-0e04-4763-bcaf-0d4118491f1c,
  abstract     = {Thermal actions are considered in the design of bridges, as temperature variations can lead to restraint stresses and subsequent cracking. However, load descriptions are in some cases oversimplified or incompatible with modern applications, and background studies are limited. This paper therefore aims to develop a more detailed load description for the load case describing temperature differences between structural parts in bridges, focusing on portal frame bridges. The temperature in portal frame bridges is investigated by performing long-term thermal simulations using weather data from several locations in Sweden, and thereafter performing statistical analyses of the resulting temperature variations over time. The study gives suggestions of both characteristic and quasi-permanent values to be used in design based on the statistical analyses, and also notes a gradual change in temperature between structural parts, which could be considered in the design. The resulting quasi-permanent values are significantly lower than the values given in the Eurocode for temperature differences between structural parts, which, in turn, will lead to smaller and more realistic stress values in bridge design.},
  author       = {Gottsäter, Erik and Larsson Ivanov, Oskar},
  issn         = {1683-0350},
  language     = {eng},
  month        = {08},
  publisher    = {International Association for Bridge and Structural Engineering},
  series       = {Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE)},
  title        = {Spatial Temperature Differences in Portal Frame Bridges},
  url          = {http://dx.doi.org/10.1080/10168664.2019.1632775},
  doi          = {10.1080/10168664.2019.1632775},
  year         = {2019},
}