Confinement Effectiveness Factor for Columns with Circular Cross-section: Design Codes vs. Numerical Modeling
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00350500" target="_blank" >RIV/68407700:21110/21:00350500 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Confinement Effectiveness Factor for Columns with Circular Cross-section: Design Codes vs. Numerical Modeling
Original language description
The structural performance of laterally confined concrete columns is significantly superior to conventional concrete columns, both in terms of strength and ductility. The origin of passive confinement stems from the restrained lateral expansion of concrete; the stiffer the restraint, the higher the confinement and strength. The behavior of confined columns subject to uniaxial compression can be accurately described by numerous phenomenological models from the literature or more conservatively using the design codes which cover the most typical reinforcement layouts. These design equations usually comprise two fundamental components: i) the influence of the reinforcement layout, dimensions and material properties on the magnitude and distribution of lateral confinement, and ii) the effect of lateral confinement on concrete strength. Even though the mathematical expressions for these two components have significantly changed over the last three decades, their resulting joint effect remains very similar. It would be extremely challenging to accurately measure the two coupled effects separately, but this obstacle can be conveniently resolved by using nonlinear finite element simulations. A single parameter denoted as “confinement effectiveness factor” is typically used to capture the efficiency of the stress transfer from transverse reinforcement to concrete. The scope of this contribution is to evaluate this factor numerically. In the computational study, the circular columns reinforced either with a single spiral or with circular hoops are subject to monotonous uniaxial compression. The behavior of concrete is captured by the advanced constitutive model CDPM2 proposed in 2013 by Grassl et al., and the analysis is run repeatedly with various values of reinforcement ratio and spiral pitch/hoop spacing. The results of the analysis were very consistent and indicate that the confinement effectiveness factor is very similar for both reinforcement layouts and reads 1-H/D.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
<a href="/en/project/GA19-25312S" target="_blank" >GA19-25312S: Compression tests with confinement for advanced modeling of concrete columns</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Concrete Structures: New Trends for Eco-Efficiency and Performance
ISBN
978-2-940643-08-0
ISSN
2617-4820
e-ISSN
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Number of pages
10
Pages from-to
2165-2174
Publisher name
Fédération Internationale du Béton
Place of publication
Lausanne
Event location
online from Lisbon
Event date
Jun 14, 2021
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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