Confinement Effectiveness Factor for Columns with Circular Cross-section: Design Codes vs. Numerical Modeling

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Confinement Effectiveness Factor for Columns with Circular Cross-section: Design Codes vs. Numerical Modeling

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Confinement Effectiveness Factor for Columns with Circular Cross-section: Design Codes vs. Numerical Modeling

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA19-25312S" target="_blank" >GA19-25312S: Tlakové testy se sevřením pro pokročilé modelování betonových sloupů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Concrete Structures: New Trends for Eco-Efficiency and Performance

ISBN

978-2-940643-08-0

ISSN

2617-4820

e-ISSN

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Počet stran výsledku

10

Strana od-do

2165-2174

Název nakladatele

Fédération Internationale du Béton

Místo vydání

Lausanne

Místo konání akce

online from Lisbon

Datum konání akce

14. 6. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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