Efficient approach to measuring strength and deformation of passively confined concrete

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

Efficient approach to measuring strength and deformation of passively confined concrete

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20101 - Civil engineering

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)

Publication year

2023

Confidentiality

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

Name of the periodical

Materials and Structures

ISSN

1359-5997

e-ISSN

1871-6873

Volume of the periodical

56

Issue of the periodical within the volume

9

Country of publishing house

FR - FRANCE

Number of pages

19

Pages from-to

1-19

UT code for WoS article

001188077800001

EID of the result in the Scopus database

2-s2.0-85174448814