Ultimate concrete compressibility in reinforced concrete elements
О. A. Shkurupiy
Poltava National technical University after Yuri Kondratyuk
Annotation: The article is devoted to the analysis of the ultimate deformation determination methods of compressed concrete (ebu) on the basis of deformed models (DM) of reinforced concrete elements (RCE) of Eurocode 2, SRIBC (Kyiv) and DM with the extreme strength criterion (ESC). DM application in of reinforced concrete the theory is a significant step forward, as this theory uses a full set of mechanics equations of deformed body state (MDSS): physical equations for concrete and armature, geometrical and balance equations. As a result DM allows to find more precisely the borders of over reinforcement modification, and durability of RCE, to take into account the character of complete diagrams of concrete and armature operation and other characteristic features. The existing DM, besides DM with ESC, need the experimental ultimate deformation determination of the compressed concrete ebu. The advantages of DM with ESC, have been shown which allow to determine analytically the value of ebu and other characteristics RCE of normal section in the ultimate state. It has been marked that ultimate deformation of compressed concrete zone of ebu is determined by tensions redistribution of on the height of heterogeneously tense compressed zone of RCE normal section in the ultimate state. Such a redistribution of tensions is impossible in the centrally compressed concrete prisms, and they cannot be used for ebu determination. It has been proved that it isn’t be taken the value ebu permanent and equal 3.5% and decrease it’s meaning within 3.5-2.8% for high durable concretes for reinforced elements manufactured of low and average durability in the way of suggested by Eurocode 2. It is not conformed with the experiments and calculations according to DM with ESC.
Keywords: reinforced concrete element, ultimate deformation of concrete, deformation model, strength criterion.
Pages: 207-212.
Link for citation: Shkurupiy, О. A. Ultimate concrete compressibility in reinforced concrete elements. – Text : electronic. – In: Modern Industrial and Civil Construction. – 2008. – Vol. 4, N 4. – Р. 207-212. – URL: https://donnasa.ru/publish_house/journals/spgs/2008-4/06_schkurupij.pdf (date of access: 16.09.2024). (in Russian)
Vol. 4, N 4 (2008)Journal: Modern Industrial and Civil Construction
Publish house: Donbas National Academy of Civil Engineering and Architecture