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Description
  • Statistical procedures for estimating concrete strength from small samples provided in the new European document EN 13791 (2007) are different from those accepted in material independent Eurocode EN 1990 (2002). Differences between these two approaches are not negligible and appear to be important particularly for assessment of existing structures. The characteristic values (5% fractiles) of concrete strength determined in accordance with EN 13791 are systematically greater than values obtained using EN 1990 procedure. The differences increase up to 8 MPa with decreasing number of tests. Moreover, according to EN 13791, the variation of the characteristic strength with number of tests results is discontinuous. Thus, it is desirable to harmonise the procedures given in EN 13791 for determining compressive concrete strength with those provided for any material in EN 1990.
  • Statistical procedures for estimating concrete strength from small samples provided in the new European document EN 13791 (2007) are different from those accepted in material independent Eurocode EN 1990 (2002). Differences between these two approaches are not negligible and appear to be important particularly for assessment of existing structures. The characteristic values (5% fractiles) of concrete strength determined in accordance with EN 13791 are systematically greater than values obtained using EN 1990 procedure. The differences increase up to 8 MPa with decreasing number of tests. Moreover, according to EN 13791, the variation of the characteristic strength with number of tests results is discontinuous. Thus, it is desirable to harmonise the procedures given in EN 13791 for determining compressive concrete strength with those provided for any material in EN 1990. (en)
  • Využití zkoušek je důležitou součástí ověřování spolehlivosti existujících železobetonových konstrukcí, u kterých jsou nejistoty o vlastnostech materiálů často velmi významné. Statistické metody se uplatní především při odhadu charakteristické hodnoty pevnosti betonu. Obecné postupy hodnocení a navrhování konstrukcí z libovolného materiálu na základě zkoušek uvádí příloha D normy ČSN EN 1990. Postupy pro stanovení charakteristické hodnoty pevnosti betonu v konstrukcích na základě zkoušek uvádí nový evropský dokument EN 13791. Postupy podle ČSN EN 1990 a EN 13791 se však navzájem liší a mohou vést k rozdílným odhadům charakteristické hodnoty. Ukazuje se, že empirické vztahy uvedené v novém předpisu EN 13791 vedou zpravidla k vyšším hodnotám charakteristické pevnosti a jsou tedy na nebezpečné straně. (cs)
Title
  • Estimation of Concrete Strength from Small Samples
  • Estimation of Concrete Strength from Small Samples (en)
  • Odhad pevnosti betonu při malém počtu zkoušek (cs)
skos:prefLabel
  • Estimation of Concrete Strength from Small Samples
  • Estimation of Concrete Strength from Small Samples (en)
  • Odhad pevnosti betonu při malém počtu zkoušek (cs)
skos:notation
  • RIV/68407700:21610/07:07136982!RIV08-GA0-21610___
http://linked.open.../vavai/riv/strany
  • 233;240
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • P(GA103/06/1562)
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
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http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 420470
http://linked.open...ai/riv/idVysledku
  • RIV/68407700:21610/07:07136982
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Eurocodes; concrete strength; small samples (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...ontrolniKodProRIV
  • [26DD89A43355]
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  • Ghent
http://linked.open...i/riv/mistoVydani
  • Ghent
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  • Proceedings of the 5th International Probabilistic Workshop
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http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...iv/tvurceVysledku
  • Holický, Milan
  • Sýkora, Miroslav
  • Jung, Karel
http://linked.open...vavai/riv/typAkce
http://linked.open.../riv/zahajeniAkce
number of pages
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  • ACCO
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  • 978-3-00-022030-2
http://localhost/t...ganizacniJednotka
  • 21610
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