An improved calibration method of the K&C model for modeling steel-fiber reinforced concrete

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The K&C material model, one of the widely used concrete models implemented in LS-DYNA for blast or impact analysis, is modified to improve its numerical accuracy for steel-fiber reinforced concrete (SFRC). Many input parameters are required in this model to describe the material properties of SFRC. To address this, an improved calibration method that can easily predict the stress–strain relationships of SFRC by modifying the three strength surfaces and the damage function η(λ) based on uniaxial and triaxial compression data from previous studies is proposed in this paper. The calibration method is verified by single element tests for unconfined uniaxial and triaxial compressive data. In addition, with the introduction of the dynamic increase factor (DIF), a finite element model is produced to demonstrate the validity and applicability of the proposed method through comparison with the experimental results of SFRC slabs subjected to projectile impact.
Publisher
ELSEVIER SCI LTD
Issue Date
2021-08
Language
English
Article Type
Article
Citation

COMPOSITE STRUCTURES, v.269, pp.114010

ISSN
0263-8223
DOI
10.1016/j.compstruct.2021.114010
URI
http://hdl.handle.net/10203/285929
Appears in Collection
CE-Journal Papers(저널논문)
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