Evaluation of cyclic bond-slip behavior of smooth bars in low strength concrete: An experimental and stochastic study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25510%2F22%3A39918832" target="_blank" >RIV/00216275:25510/22:39918832 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.istruc.2022.05.036" target="_blank" >https://doi.org/10.1016/j.istruc.2022.05.036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.istruc.2022.05.036" target="_blank" >10.1016/j.istruc.2022.05.036</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of cyclic bond-slip behavior of smooth bars in low strength concrete: An experimental and stochastic study

Popis výsledku v původním jazyce

The vulnerability of non-engineered/substandard reinforced concrete (RC) members could arise from the bondslip failure due to low interaction between the smooth bar and poor-quality (low-strength) concrete. Therefore, the cyclic bond-slip response of plain round bars in poor-quality concrete is characterized by experimental and stochastic approaches. To this end, beam-type bond-slip specimens are first exposed to quasi-static cyclic loading. Then, mathematical models are derived from the experimental hysteric responses. Inherent uncertainties in nominally identical tests reveal the high scatter in the response parameters. Therefore, finite element (FE) models generated by implementing the proposed mathematical expressions for bond-slip response are combined with a suitable stochastic sampling technique, which is Latin Hypercube Sampling (LHS). The apparent outcome is the set of load-displacement curves, which formed an envelope around the deterministic model. The peak capacity is captured satisfactorily by the stochastic-numerical models whereas the overall cyclic response is reproduced less accurately. The evaluated bond stress values and corresponding slips in the confined concrete are higher than the ones in the unconfined concrete. Moreover, the cyclic excitation impacts on the bond strength are more recognizable than monotonic loading. The sensitivity analysis, which grades the contribution of the material parameters on the global response, points out the tensile strength of concrete fct as the most significant parameter while the remaining ones have a weak or no influence.

Název v anglickém jazyce

Evaluation of cyclic bond-slip behavior of smooth bars in low strength concrete: An experimental and stochastic study

Popis výsledku anglicky

The vulnerability of non-engineered/substandard reinforced concrete (RC) members could arise from the bondslip failure due to low interaction between the smooth bar and poor-quality (low-strength) concrete. Therefore, the cyclic bond-slip response of plain round bars in poor-quality concrete is characterized by experimental and stochastic approaches. To this end, beam-type bond-slip specimens are first exposed to quasi-static cyclic loading. Then, mathematical models are derived from the experimental hysteric responses. Inherent uncertainties in nominally identical tests reveal the high scatter in the response parameters. Therefore, finite element (FE) models generated by implementing the proposed mathematical expressions for bond-slip response are combined with a suitable stochastic sampling technique, which is Latin Hypercube Sampling (LHS). The apparent outcome is the set of load-displacement curves, which formed an envelope around the deterministic model. The peak capacity is captured satisfactorily by the stochastic-numerical models whereas the overall cyclic response is reproduced less accurately. The evaluated bond stress values and corresponding slips in the confined concrete are higher than the ones in the unconfined concrete. Moreover, the cyclic excitation impacts on the bond strength are more recognizable than monotonic loading. The sensitivity analysis, which grades the contribution of the material parameters on the global response, points out the tensile strength of concrete fct as the most significant parameter while the remaining ones have a weak or no influence.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20102 - Construction engineering, Municipal and structural engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Structures

ISSN

2352-0124

e-ISSN

2352-0124

Svazek periodika

41

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

568-585

Kód UT WoS článku

000806170700002

EID výsledku v databázi Scopus

2-s2.0-85130904082