Publication detail

Characterisation of Spatial Variability in Lattice Models

MARCON, M. PODROUŽEK, J. VOREL, J. WENDNER, R.

Original Title

Characterisation of Spatial Variability in Lattice Models

Type

conference paper

Language

English

Original Abstract

The paper aims to characterize different sources of spatial variability in lattice discrete particle models (LDPM) of heterogenous materials in order to support the hypotheses on a causal relationship between spatial variability, auto-correlation length of the random fields, type of spectral function and meso/micro-structure of the material. The associated microstructural features are mimicked by the proposed particle placement schemes for LDPM, which are no longer independent and random, but are correlated to initial random or gradient-based field. The study is based on high-dimensional Monte Carlo (MC) LDPM simulations of 3 classical concrete tests in which the inherent variability and production process are represented by the proposed particle placement schemes with varying parameters. Although the material property fields are kept constant, the captured functional form for the coefficient of variation of the load capacity and various power spectral parameters clearly supports the hypotheses on a causal relationship between spatial variability features and internal structure of the material. Furthermore, the different orientations of the gradient-based filed may be evaluated as a sensitivity to different casting directions, affecting not only scattering of the response, but also the mean values. This research represents an extreme case of high-dimensional MC problem and as such is yet limited to scientific clusters (supercomputers). As a proof of concept, however, the implications are important to the entire disciplin of structural reliability and safety due to the ability to obtain the functional form for mean values and coefficient of variation of response series and as such represents a fundamental concept for spatial variability based structural reliability.

Keywords

-

Authors

MARCON, M.; PODROUŽEK, J.; VOREL, J.; WENDNER, R.

Released

1. 10. 2017

Publisher

ECCOMAS

Location

Porto, Portugal

ISBN

9788494690969

Book

COMUS17 - Eccomas Thematic Conference - COMPUTATIONAL MODELLING OF MULTI-UNCERTAINTY AND MULTI-SCALE PROBLEMS

Pages from

1

Pages to

12

Pages count

12

BibTex

@inproceedings{BUT140553,
  author="Marco {Marcon} and Jan {Podroužek} and Jan {Vorel} and Roman {Wendner}",
  title="Characterisation of Spatial Variability in Lattice Models",
  booktitle="COMUS17 -  Eccomas Thematic Conference -  COMPUTATIONAL MODELLING OF MULTI-UNCERTAINTY AND MULTI-SCALE PROBLEMS",
  year="2017",
  pages="1--12",
  publisher="ECCOMAS",
  address="Porto, Portugal",
  isbn="9788494690969"
}