- Title
- Modelling of crack propagation of gravity dams by scaled boundary polygons and cohesive crack model
- Creator
- Shi, Mingguang; Zhong, Hong; Ooi, Ean Tat; Zhang, Chuhan; Song, Chongmin
- Date
- 2013
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/101785
- Identifier
- vital:10733
- Identifier
- ISSN:0376-9429
- Abstract
- Crack propagation in concrete gravity dams is investigated using scaled boundary polygons coupled with interface elements. The concrete bulk is assumed to be linear elastic and is modelled by the scaled boundary polygons. The interface elements model the fracture process zone between the crack faces. The cohesive tractions are modelled as side-face tractions in the scaled boundary polygons. The solution of the stress field around the crack tip is expressed semi-analytically as a power series. It reproduces the singular and higher-order terms in an asymptotic solution, such as the William's eigenfunction expansion when the cohesive tractions vanish. Accurate results can be obtained without asymptotic enrichment or local mesh refinement. The stress intensity factors are obtained directly from their definition and provide a convenient and accurate means to assess the zero-K condition, which determines the stability of a cohesive crack. The direction of crack propagation is determined from the maximum circumferential stress criterion. To accommodate crack propagation, a local remeshing algorithm that is applicable to any polygon mesh is augmented by inserting cohesive interface elements between the crack surfaces as the cracks propagate. Three numerical benchmarks involving crack propagation in concrete gravity dams are modelled. The results are compared to the experimental and other numerical simulations reported in the literature. © 2013 Springer Science+Business Media Dordrecht.
- Relation
- International Journal of Fracture Vol. 183, no. 1 (2013), p. 29-48
- Rights
- Copyright Springer
- Rights
- This metadata is freely available under a CCO license
- Subject
- Cohesive crack model; Crack propagation; Gravity dam; Polygon element; Scaled boundary finite element method; Circumferential stress; Cohesive crack modeling; Concrete gravity dams; Eigenfunction expansions; Local mesh refinement; Stress field around the crack tips; Concrete dams; Concretes; Crack tips; Eigenvalues and eigenfunctions; Geometry; Gravity dams; Cracks; 0905 Civil Engineering; 0912 Materials Engineering; 0913 Mechanical Engineering
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