Publication detail

Interplay of size effects in concrete specimens studied via computational stochastic fracture mechanics

VOŘECHOVSKÝ, M.

Original Title

Interplay of size effects in concrete specimens studied via computational stochastic fracture mechanics

Type

journal article - other

Language

English

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 several identified scaling lengths stemming from the material, boundary conditions and geometry. Methods 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 modeled using microplane material law to show that a large portion of the dependence of nominal strength on structural size can be explained deterministically. However, it is clear that more sources of size effect play a part, and we consider two of them. Namely, 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 (deterministic-energetic, statistical size effects, and the weak layer effect) 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 approach represents a marriage of advanced computational nonlinear fracture mechanics with simulation techniques for random fields representing spatially varying material properties. Using a numerical example, we document how different sources of size effects detrimental to strength can interact and result in relatively complex quasibrittle failure processes. The presented study documents the well known fact that the experimental determination of material parameters (needed for the rational and safe design of structures) is very difficult for quasibrittle materials such as concrete.

Keywords

Size effect; Scaling; Random field; Weak boundary; Crack band; Microplane model; Dog-bone specimens; Quasibrittle failure; Crack initiation; Stochastic simulation; Characteristic length

Key words in English

Size effect; Scaling; Random field; Weak boundary; Crack band; Microplane model; Dog-bone specimens; Quasibrittle failure; Crack initiation; Stochastic simulation; Characteristic length

Authors

VOŘECHOVSKÝ, M.

RIV year

2007

Released

10. 5. 2007

Publisher

Elsevier

Location

USA

ISBN

0020-7683

Periodical

International Journal of Solids and Structures

Year of study

44

Number

9

State

United Kingdom of Great Britain and Northern Ireland

Pages from

2715

Pages to

2731

Pages count

17

BibTex

@article{BUT44338,
  author="Miroslav {Vořechovský}",
  title="Interplay of size effects in concrete specimens studied via computational stochastic fracture mechanics",
  journal="International Journal of Solids and  Structures",
  year="2007",
  volume="44",
  number="9",
  pages="2715--2731",
  issn="0020-7683"
}