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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Accuracy and Improvements for Variable and Constant Confinement Concrete Models
Author(s): C.J. Naito and F. Cetisli
Publication: Special Publication
Appears on pages(s): 157-176
Keywords: constitutive models; experimental tests; FEM analysis; FRP; steel jacketed
Abstract:A series of experiments were conducted on the performance of concrete under varying levels of passive confinement. Glass and carbon fiber reinforced polymers, and steel plate were used to provide confinement. The research presented compares the measured performance of the jacketed systems with current predictor models and finite element estimations. Two categories of predictor models are examined: Constant Confinement (CC) and Variable Confinement (VC). The CC model assumes that the confining pressure provided by the jacket is active and constant over the load history. VC model assumes that the confinement passively increases as lateral dilation occurs. The research shows that VC models provide improved accuracy over CC models in predicting the stress strain response of confined concrete. Use of multi-linear relationships between axial and transverse strain combined with stress-strain relationships previously developed provide a comprehensive method of estimation. The limitations of these methods are clearly illustrated through examples.
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