Advanced

Estmating Extreme Thermal Actions in Concrete Structures

Larsson, Oskar LU (2010) The Third fib International Congress and Exhibition In Proceedings Disc, The Third International fib Congress and Exhibition
Abstract
The surrounding climate gives temperature variations in both time and space for concrete structures. Due to external and internal restraints thermal strains and stresses may develop in the structure and these stresses can contribute to cracking. This will affect the performance of the structure. To predict the dynamic thermal conditions in concrete structures a finite element model has been developed. Field temperature measurements in a concrete slab placed outdoors and measurements of climatic data are used for the validation of the model. A validation with input data from the Swedish Meteorological and Hydrological Institute has also been performed to be able to use the model for simulations over long time periods. The results show that... (More)
The surrounding climate gives temperature variations in both time and space for concrete structures. Due to external and internal restraints thermal strains and stresses may develop in the structure and these stresses can contribute to cracking. This will affect the performance of the structure. To predict the dynamic thermal conditions in concrete structures a finite element model has been developed. Field temperature measurements in a concrete slab placed outdoors and measurements of climatic data are used for the validation of the model. A validation with input data from the Swedish Meteorological and Hydrological Institute has also been performed to be able to use the model for simulations over long time periods. The results show that the model can describe the effects from different climatic factors in extreme situations with good accuracy based on data from meteorological stations. It is important to use climatic data with a good resolution, since variations during the day can give unfavorable situations. The analyses with longer time periods show that the values for linear temperature gradients in the Eurocode could be underestimated for Swedish conditions. There is also a tendency towards geographical differences which has not been included before. An asphalt paving layer increases positive linear temperature gradients while they decrease with a concrete paving. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Extreme values, KstrConcrete, Thermal actions, Solar radiation
in
Proceedings Disc, The Third International fib Congress and Exhibition
conference name
The Third fib International Congress and Exhibition
language
English
LU publication?
yes
id
b971479d-3923-4245-8d19-a48a84fca9f8 (old id 1661159)
date added to LUP
2010-10-20 13:58:43
date last changed
2016-04-16 12:37:12
@misc{b971479d-3923-4245-8d19-a48a84fca9f8,
  abstract     = {The surrounding climate gives temperature variations in both time and space for concrete structures. Due to external and internal restraints thermal strains and stresses may develop in the structure and these stresses can contribute to cracking. This will affect the performance of the structure. To predict the dynamic thermal conditions in concrete structures a finite element model has been developed. Field temperature measurements in a concrete slab placed outdoors and measurements of climatic data are used for the validation of the model. A validation with input data from the Swedish Meteorological and Hydrological Institute has also been performed to be able to use the model for simulations over long time periods. The results show that the model can describe the effects from different climatic factors in extreme situations with good accuracy based on data from meteorological stations. It is important to use climatic data with a good resolution, since variations during the day can give unfavorable situations. The analyses with longer time periods show that the values for linear temperature gradients in the Eurocode could be underestimated for Swedish conditions. There is also a tendency towards geographical differences which has not been included before. An asphalt paving layer increases positive linear temperature gradients while they decrease with a concrete paving.},
  author       = {Larsson, Oskar},
  keyword      = {Extreme values,KstrConcrete,Thermal actions,Solar radiation},
  language     = {eng},
  series       = {Proceedings Disc, The Third International fib Congress and Exhibition},
  title        = {Estmating Extreme Thermal Actions in Concrete Structures},
  year         = {2010},
}