Efficient approach to measuring strength and deformation of passively confined concrete

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F23%3A00368835" target="_blank" >RIV/68407700:21110/23:00368835 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1617/s11527-023-02255-0" target="_blank" >https://doi.org/10.1617/s11527-023-02255-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1617/s11527-023-02255-0" target="_blank" >10.1617/s11527-023-02255-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Efficient approach to measuring strength and deformation of passively confined concrete

Popis výsledku v původním jazyce

This paper presents a novel experimental method developed to determine the increase in concrete strength and the evolution of both axial and lateral deformation under confined compression. In contrast to expensive and time-consuming triaxial experiments, the present method requires only a uniaxial testing machine with displacement control. In the proposed setup, a concrete cylinder is surrounded by metal rings, which are activated by the lateral expansion of concrete and provide passive confinement. The magnitude of confinement can be easily controlled by the dimensions and spacing of the rings. In contrast to triaxial tests, the stress history is much closer to that encountered in real structural members. The most suitable measuring setup is a combination of conventional and non-contact measurements, namely of the vertical extensometers for the axial strain and digital image correlation for the hoop strain. The results indicate that the lateral deformation needs to be averaged over a representative volume as its distribution over the height of the specimen becomes highly nonuniform in the postpeak. The proposed setup was successfully verified on 20 concrete cylinders with 4 different ring layouts. The measured strength increase due to confinement is consistent with models from the literature and thus with triaxial tests that were used for their development and calibration. The experimental scatter decreases with increasing magnitude of confinement and decreasing spacing of the rings.

Název v anglickém jazyce

Efficient approach to measuring strength and deformation of passively confined concrete

Popis výsledku anglicky

This paper presents a novel experimental method developed to determine the increase in concrete strength and the evolution of both axial and lateral deformation under confined compression. In contrast to expensive and time-consuming triaxial experiments, the present method requires only a uniaxial testing machine with displacement control. In the proposed setup, a concrete cylinder is surrounded by metal rings, which are activated by the lateral expansion of concrete and provide passive confinement. The magnitude of confinement can be easily controlled by the dimensions and spacing of the rings. In contrast to triaxial tests, the stress history is much closer to that encountered in real structural members. The most suitable measuring setup is a combination of conventional and non-contact measurements, namely of the vertical extensometers for the axial strain and digital image correlation for the hoop strain. The results indicate that the lateral deformation needs to be averaged over a representative volume as its distribution over the height of the specimen becomes highly nonuniform in the postpeak. The proposed setup was successfully verified on 20 concrete cylinders with 4 different ring layouts. The measured strength increase due to confinement is consistent with models from the literature and thus with triaxial tests that were used for their development and calibration. The experimental scatter decreases with increasing magnitude of confinement and decreasing spacing of the rings.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

2023

Kód důvěrnosti údajů

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

Název periodika

Materials and Structures

ISSN

1359-5997

e-ISSN

1871-6873

Svazek periodika

56

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

19

Strana od-do

1-19

Kód UT WoS článku

001188077800001

EID výsledku v databázi Scopus

2-s2.0-85174448814