Stress-compatible embedded cohesive crack in CST element

John Forbes Olesen, Peter Noe Poulsen

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    Abstract

    A simple element with an embedded strong discontinuity for modeling cohesive cracking of concrete is presented. The element differs from previous elements of the embedded type, in that a consistent stress field is obtained by direct enforcement of stress continuity across the crack. The displacement discontinuity is modeled in an XFEM fashion; however, the discontinuous displacement field is special, allowing for the direct enforcement of stress continuity. This in turn allows for elimination of extra degrees of freedom necessary for describing the crack deformations, thus the element has the same number of freedoms as its continuous basis: CST. The good performance of the element is demonstrated by its ability to simulate threepoint bending of a notched concrete beam. The advantage of the element is its simplicity and the straightforward implementation of it. Handling situations with multiple cracks will not require further evelopments, although this is not demonstrated here.
    Original languageEnglish
    Title of host publicationFracture Mechanics of Concrete and Concrete Structures
    VolumeVolume 1, Part 3
    Place of PublicationSeoul, Korea
    PublisherKorea Concrete Institute, Seoul
    Publication date2010
    Pages586-591
    ISBN (Print)978-89-5708-180-8
    Publication statusPublished - 2010
    Event7th International Conference on Fracture Mechanics of Concrete and Concrete Structures - Jeju, Korea, Republic of
    Duration: 23 May 201027 May 2010
    Conference number: 7

    Conference

    Conference7th International Conference on Fracture Mechanics of Concrete and Concrete Structures
    Number7
    Country/TerritoryKorea, Republic of
    CityJeju
    Period23/05/201027/05/2010

    Keywords

    • FEM, crack, cohesive, embedded, CST

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