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VOŘECHOVSKÝ, M. MATESOVÁ, D.
Original Title
Modelování vlivu velikosti betonových konstrukcí pomocí nelineární stochastické lomové mechaniky
English Title
Modeling size effect of concrete structures with nonlinear stochastic fracture mechanics
Type
conference paper
Language
Czech
Original Abstract
We attempt the identification, study and modeling of possible sources of size effects in concrete structures acting both separately and together. We are particularly motivated by the interplay of sev-eral identified scaling lengths stemming from the material, boundary conditions and geometry. Meth-ods of stochastic nonlinear fracture mechanics are used to model the well published results of direct tensile tests of dog-bone specimens with rotating boundary conditions. Firstly, the specimens are mod-eled using microplane material law to show that a large portion of the dependence of nominal strength on structural size can be explained deterministically. Next, we model local material strength using an autocorrelated random field attempting to capture a statistical part of the complex size effect, scatter inclusive. In addition, the strength drop noticeable with small specimens which was obtained in the experiments is explained by the presence of a weak surface layer of constant thickness (caused e.g. by drying, surface damage, aggregate size limitation at the boundary, or other irregularities). All three named sources are believed to be the sources most contributing to the observed strength size effect; the model combining all of them is capable of reproducing the measured data. The computational ap-proach represents a marriage of advanced computational nonlinear fracture mechanics with simulation techniques for random fields representing spatially varying material properties.
English abstract
Key words in English
computational stochastic, fracture mechanics, size effect, random field, weak boundary crack band
Authors
VOŘECHOVSKÝ, M.; MATESOVÁ, D.
RIV year
2006
Released
3. 10. 2006
Location
Brno, ČR
ISBN
80-214-3251-9
Book
Pravděpodobnost porušování konstrukcí
Pages from
269
Pages to
284
Pages count
16
BibTex
@inproceedings{BUT24179, author="Miroslav {Vořechovský} and Dita {Vořechovská}", title="Modelování vlivu velikosti betonových konstrukcí pomocí nelineární stochastické lomové mechaniky", booktitle="Pravděpodobnost porušování konstrukcí", year="2006", pages="269--284", address="Brno, ČR", isbn="80-214-3251-9" }