Abstract

Concrete dilation is one of the main parameters that controls the stress-strain behavior of confined concrete. Several analytical studies have been carried out to predict the stress-strain behavior of concrete encased in fiber-reinforced polymer (FRP), which is crucial for structural design. However, none of these studies have provided a simple formula to determine the dilation parameter that is always required in the finite element (FE) material modelling of concrete. This paper presents a simple empirical model predicting the confined concrete dilation parameter within the theoretical framework of a Karagozian and Case type concrete plasticity model. A set of 105 FRP-confined specimens with different unconfined concrete strengths (f'c) and confinement moduli (E1) was analyzed using the LS-DYNA program. The model predictions of the confined ultimate strength (f'cc), confined ultimate axial strain (ℰcc) and confined ultimate hoop strain (ℰh) were compared with the corresponding experimental database results for each specimen. In addition, the model axial and hoop stress-strain curves of each specimen were developed and compared with the corresponding experimental ones. The proposed model was able to predict stress-strain curves of the test specimens quite well. The proposed model was able to predict f'cc with mean errors (M) and standard deviations (SD) of 2.6% and 10.7%, respectively. Similarly, the model predicted ℰcc with M and SD values of 0.3% and 29.0%, respectively. Finally, the model was less successful in predicting ℰh with M and SD values of 13.7% and 26.3%, respectively. © 2014 Elsevier Ltd.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Concrete shear dilation; Finite element analysis; FRP-confined concrete; K-C plasticity model; LS-DYNA

International Standard Serial Number (ISSN)

0141-0296

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

15 Nov 2014

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