English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The contribution presents simulations of fracture in concrete beams loaded in three-point bending via discrete model. The size and distribution of discrete units reflect the concrete heterogeneity and together with properties of their contacts provide an internal length scale. Due to a random placement of the discrete units, the model mimics natural randomness of material structure arising from its random heterogeneity. A second random component of the model considered is additional fluctuation of material parameters at contacts between the units. This randomness reflects variations in material properties due to mixing, drying, etc. and it is considered in a form of random field with its own internal length scale provided in a form of autocorrelation length. By changing the ratios between the autocorrelation length and the internal length arising from heterogeneities, one can observe strong effects of this ratio on structural strength when cracks propagate from smooth surface. For deeply notched beams, the spatial strength fluctuations only affects the variance of the peak load and no significant effect observed on its mean value. The described dependency of structural strength on the ratio between the two characteristic lengths is demonstrated and elucidated.

Interplay of probabilistic and deterministic internal length in simulations of concrete fracture