concrete- fracture mechanics and size effect 4.02

Question 1

Cohesive crack model
numerical implementation: Fictitious Crack model by Hillerborg

Answer 1

-disadvantages:
*crack path must be known in advance
-aid:
*positioning of interface elements along all possible crack paths
*using on automatic mesh adjustment

Question 2

Cohesive crack model
numerical implementation: Crack Band Model von Bazant und Oh

Answer 2

-Disadvantage:
The extension of the process zone (crack
band) is represented by the element width
-> the variation of the width of the process
zone under load as well as stress
distribution over the width of the process
zone can not be modelled

-Aid:
Using the models, which operate with
higher-order continuum (non-local
continuum model, gradient model etc.)