DBN Concrete and reinforced concrete structures intended to operate under elevated and high temperatures

Abstract

Current codes and regulations are applied to the design of concrete and reinforced concrete structures intended to operate under conditions of systematic exposure to elevated and high technological temperatures. It is proposed to develop a statutory instrument to replace the SNiP 2.03.04-84 changing its status for the DBN one. The purpose of the project is to create a new national regulatory instrument, which is based on the modern achievements of science, machinery and technology, advanced domestic and foreign experience of design and construction and at the same time uses theoretical and experimental studies of the updated version of SNIP 2.03.04-84. This regulatory instrument is extremely necessary for the development of national production of Ukraine. The calculation of “Concrete and Reinforced Concrete Structures for High and High Temperature Exposure” begins with the definition using Eurocode 2 EN 1992-1-1:2005 at normal temperature of 20°C, then is followed by improvements using a mathematical model of the ratio “stress-strain” of concrete at elevated temperatures, refinement of the load-bearing criteria of concrete structures in EN 1994-1-2:2004. The determination of the maximum strain on the basis of the energy approach allowed us to formulate its adjusted dependence on temperature, the values of the parameters of the stress-strain diagram. According to these data, the stress-strain diagrams of concrete during compression and heating according to Eurocode EN 1992-1-2:2004 are calculated using the formulae of the first stage.