Bond stress distribution in adhesive anchor systems: Interplay of concrete and mortar creep

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00353534" target="_blank" >RIV/68407700:21110/22:00353534 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.engstruct.2021.113293" target="_blank" >https://doi.org/10.1016/j.engstruct.2021.113293</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.engstruct.2021.113293" target="_blank" >10.1016/j.engstruct.2021.113293</a>

Result language

angličtina

Original language name

Bond stress distribution in adhesive anchor systems: Interplay of concrete and mortar creep

Original language description

The safe design of fastening systems, especially considering the multi-decade performance, relies on a thorough understanding of mechanisms and processes that lead to excessive deformations or even failure in course of time. According to current design guidelines and standards, adhesive anchor system are designed based on the uniform bond model. The uniform bond model is a generally good approximation of the real stress distribution during short-term testing and for loads close to the pull-out capacity of the system. However, both concrete and adhesive mortar are characterized by pronounced time-dependent deformation, especially at elevated temperatures. Thus, noteworthy shear stress redistributions are expected due to creep in course of a structure's life-time. Depending on the level of stress redistributions potentially critical stress levels may be reached locally, triggering progressive failure. Therefore, it is quintessential to understand bond stress redistribution phenomena in adhesive anchor systems under sustained load. Unfortunately, it is experimentally impossible to decouple the intertwined effects of concrete and adhesive creep. Thus, in this study a numerical approach is adopted. The response of concrete is modeled by a discrete meso-scale damage model in combination with the micro-prestress solidification theory coupled to a hygro-thermal chemical analysis while the adhesive layer is represented by a visco-elastic shear stress-slip law. After separate calibration of concrete creep and creep of the visco-elastic interface the obtained model is validated on independent experimental data on anchor systems. Finally, the established computational framework is utilized to virtually isolate concrete creep, adhesive creep and study their mutual interaction. Results show strong antagonistic redistribution mechanisms driven by concrete and adhesive creep with varying dominance depending on the investigated time-scale.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

<a href="/en/project/GA19-15666S" target="_blank" >GA19-15666S: Time dependent behavior of thermoset polymers with application to anchor</a><br>

Continuities

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

Publication year

2022

Confidentiality

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

Name of the periodical

Engineering Structures

ISSN

0141-0296

e-ISSN

1873-7323

Volume of the periodical

250

Issue of the periodical within the volume

113293

Country of publishing house

GB - UNITED KINGDOM

Number of pages

15

Pages from-to

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UT code for WoS article

000715052000001

EID of the result in the Scopus database

2-s2.0-85118476794