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Computers and Concrete Volume 20, Number 1, July 2017 , pages 099-110 DOI: https://doi.org/10.12989/cac.2017.20.1.099 |
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Concrete structures under combined mechanical and environmental actions: Modelling of durability and reliability |
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Dita Vořechovská, Martina Šomodíková, Jan Podroužek, David Lehký and Břetislav Teplý
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| Abstract | ||
| Service life assessments which do not include the synergy between mechanical and environmental loading are neglecting a factor that can have a significant impact on structural safety and durability assessment. The degradation of concrete structure is a result of the combined effect of environmental and mechanical factors. In order to make service life design realistic it is necessary to consider both of these factors acting simultaneously. This paper deals with the advanced modelling of concrete carbonation and chloride ingress into concrete using stochastic 1D and 2D models. Widely accepted models incorporated into the new fib Model Code 2010 are extended to include factors that reflect the coupled effects of mechanical and environmental loads on the durability and reliability of reinforced concrete structures. An example of cooling tower degradation by carbonation and an example of a bended reinforced concrete beam kept for several years in salt fog are numerically studied to show the capability of the stochastic approach. The modelled degradation measures are compared with experimental results, leading to good agreement. | ||
| Key Words | ||
| concrete structures; synergy; mechanical loading; environmental loading; modelling; service life; reliability | ||
| Address | ||
| Dita Vořechovská, Martina Šomodíková, Jan Podroužek and David Lehký: Institute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech Republic Břetislav Teplý: Institute of Chemistry, Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 602 00 Brno, Czech Republic | ||