Finite Element Analysis of Concrete Fracture Specimens

View/ Open
Issue Date
1984-05Author
Leibengood, Linda D.
Darwin, David
Dodds, Robert H., Jr
Publisher
University of Kansas Center for Research, Inc.
Type
Technical Report
Is part of series
SM Report;11
Published Version
https://iri.ku.edu/reportsMetadata
Show full item recordAbstract
The effects of the descending branch of the tensile stress-strain curve, fracture energy, grid refinement, and load-step size on the response of finite element models of notched concrete beams are studied. The width of the process zone and constraint of crack angles are investigated. Nonlinearity is 1 imited to cracking of the concrete. A limiting tensile stress criterion governs crack initiation. Concrete is represented as linear elastic prior to cracking. Cracks are modeled using a smeared representaion. The post-cracking behavior is controlled by the shape of the descending branch, fracture energy, crack angle, and element size. Unloading occurs at a slope equal to the i nitia 1 modulus of the material. load deflection curves and cracking patterns are used to evaluate the beam's response. Comparisons of the process zone size are made. All analyses are performed on a 200 x 200 x GOO mm concrete beam, with an initial notch length of 80 mm. The fracture energy, tensile strength, and shape of the descending branch interact to determine the stiffness and general behavior of the specimen. The width of the process zone has a negligible influence on the beam's response. The importance of proper crack orientation is demonstrated. The model is demonstrated to be objective with respect to grid refinement and load-step size.
Collections
Citation
Leibengood, L.D., Darwin, D., and Dodds, R.H., "Finite Element Analysis of Concrete Fracture Specimens," SM Report No. 11, University of Kansas Center for Research, Inc., Lawrence, Kansas, May 1984, 128 pp.
Items in KU ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
We want to hear from you! Please share your stories about how Open Access to this item benefits YOU.