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Simulation of Thermal Load Distribution in Portal Frame Bridges

Gottsäter, Erik LU ; Larsson Ivanov, Oskar LU ; Molnár, Miklós LU ; Crocetti, Roberto LU ; Nilenius, Filip and Plos, Mario (2017) In Engineering Structures 143. p.219-231
Abstract
Uneven exposure to e.g. solar radiation can cause temperature differences between various structural parts of a bridge, which leads to tensile stresses if the parts cannot move freely. In this study, thermal simulations and stress calculations on a model of a portal frame bridge are performed with the aim of evaluating the temperature difference between the bridge parts. Factorial design is used in a parametric study to determine the influence of different factors on the temperature difference and the largest reasonable temperature difference obtainable for the chosen weather data. The study shows that the quasi-permanent temperature difference between parts which is proposed by Eurocode 1 is overestimated, causing tensile stresses in the... (More)
Uneven exposure to e.g. solar radiation can cause temperature differences between various structural parts of a bridge, which leads to tensile stresses if the parts cannot move freely. In this study, thermal simulations and stress calculations on a model of a portal frame bridge are performed with the aim of evaluating the temperature difference between the bridge parts. Factorial design is used in a parametric study to determine the influence of different factors on the temperature difference and the largest reasonable temperature difference obtainable for the chosen weather data. The study shows that the quasi-permanent temperature difference between parts which is proposed by Eurocode 1 is overestimated, causing tensile stresses in the transverse direction to be exaggerated significantly. Using the design method proposed by Eurocode 1 is therefore likely to overestimate the required reinforcement in crack width limit design, which in turn would lead to unnecessary costs and environmental impacts. The results also indicate that the temperature distribution within the bridge is different from what is given in Eurocode load cases, and consequently, the largest tensile stresses appear in other areas of the bridge. A simplified temperature distribution is therefore investigated and shown to give similar results as the detailed thermal simulations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Engineering Structures
volume
143
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85018500843
  • wos:000401880300017
ISSN
0141-0296
DOI
10.1016/j.engstruct.2017.04.012
language
English
LU publication?
yes
id
702190a7-0bd8-4e1d-9e80-b4a68927a636
date added to LUP
2017-04-21 13:27:14
date last changed
2017-09-18 13:32:50
@article{702190a7-0bd8-4e1d-9e80-b4a68927a636,
  abstract     = {Uneven exposure to e.g. solar radiation can cause temperature differences between various structural parts of a bridge, which leads to tensile stresses if the parts cannot move freely. In this study, thermal simulations and stress calculations on a model of a portal frame bridge are performed with the aim of evaluating the temperature difference between the bridge parts. Factorial design is used in a parametric study to determine the influence of different factors on the temperature difference and the largest reasonable temperature difference obtainable for the chosen weather data. The study shows that the quasi-permanent temperature difference between parts which is proposed by Eurocode 1 is overestimated, causing tensile stresses in the transverse direction to be exaggerated significantly. Using the design method proposed by Eurocode 1 is therefore likely to overestimate the required reinforcement in crack width limit design, which in turn would lead to unnecessary costs and environmental impacts. The results also indicate that the temperature distribution within the bridge is different from what is given in Eurocode load cases, and consequently, the largest tensile stresses appear in other areas of the bridge. A simplified temperature distribution is therefore investigated and shown to give similar results as the detailed thermal simulations.},
  author       = {Gottsäter, Erik and Larsson Ivanov, Oskar and Molnár, Miklós and Crocetti, Roberto and Nilenius, Filip and Plos, Mario},
  issn         = {0141-0296},
  language     = {eng},
  month        = {04},
  pages        = {219--231},
  publisher    = {Elsevier},
  series       = {Engineering Structures},
  title        = {Simulation of Thermal Load Distribution in Portal Frame Bridges},
  url          = {http://dx.doi.org/10.1016/j.engstruct.2017.04.012},
  volume       = {143},
  year         = {2017},
}