Mechanical fracture parameters of concrete exposed to high temperatures related to approximation of temperature fields in experimental panels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F19%3APU133535" target="_blank" >RIV/00216305:26110/19:PU133535 - 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

Mechanical fracture parameters of concrete exposed to high temperatures related to approximation of temperature fields in experimental panels

Popis výsledku v původním jazyce

Experimental concrete panels (2300 × 1300 × 150 mm) were exposed to high temperatures using the fire test furnace according to the standard temperature-time curve (ISO 834). The panels were heated to a maximal nominal temperature of 550, 600, 800 or 1000 °C, and then this temperature was maintained for 60 minutes. When the heating processes were complete, the panels were left to cool down to the ambient temperature. After that, specimens (100 × 100 × 400 mm) were cut from the panels, provided with an initial central edge notch and tested in a three-point bending test configuration. The basic mechanical fracture parameters were determined using the Effective Crack Model and the Work-of-Fracture method. To obtain more correct relations between temperature and elastic modulus, fracture toughness and fracture energy, it was necessary to employ approximation functions in the estimation of concrete temperature. Time dependent functions of temperature at different depths within the panel were obtained via the nonlinear approximation of the temperatures measured by temperature sensors. The values recorded for the mechanical fracture parameters of the tested concrete specimens were related to the fire load temperatures in the fracture process zone, which were obtained by approximation functions

Název v anglickém jazyce

Mechanical fracture parameters of concrete exposed to high temperatures related to approximation of temperature fields in experimental panels

Popis výsledku anglicky

Experimental concrete panels (2300 × 1300 × 150 mm) were exposed to high temperatures using the fire test furnace according to the standard temperature-time curve (ISO 834). The panels were heated to a maximal nominal temperature of 550, 600, 800 or 1000 °C, and then this temperature was maintained for 60 minutes. When the heating processes were complete, the panels were left to cool down to the ambient temperature. After that, specimens (100 × 100 × 400 mm) were cut from the panels, provided with an initial central edge notch and tested in a three-point bending test configuration. The basic mechanical fracture parameters were determined using the Effective Crack Model and the Work-of-Fracture method. To obtain more correct relations between temperature and elastic modulus, fracture toughness and fracture energy, it was necessary to employ approximation functions in the estimation of concrete temperature. Time dependent functions of temperature at different depths within the panel were obtained via the nonlinear approximation of the temperatures measured by temperature sensors. The values recorded for the mechanical fracture parameters of the tested concrete specimens were related to the fire load temperatures in the fracture process zone, which were obtained by approximation functions

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA16-18702S" target="_blank" >GA16-18702S: Problematika porušování v blízkosti rozhraní plniva a matrice kompozitů na silikátové bázi (AMIRI)</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings for the 2018 fib Congress held in Melbourne, Australia

ISBN

978-1-877040-15-3

ISSN

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e-ISSN

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Počet stran výsledku

11

Strana od-do

3399-3409

Název nakladatele

Fédération internationale du béton (fib)

Místo vydání

Switzerland

Místo konání akce

Melbourne

Datum konání akce

7. 10. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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