Beton

The theory of calculation of reinforced concrete structures and the principles of the Eurocode

“…The critical state of the stability of a reinforced concrete column during concrete creep is determined by a criterion that is untenable according to the Eurocode and surprising for the theory of reinforced concrete: the deflection of the middle section of the column increases to infinity (with a constant rate of its growth). The structure of the formula for additional infinite deflection caused by concrete creep becomes identical to the structure of infinitely elastic deflection according to the theory (s. 3) (see, for example, formula (8.13) in SP 63.13330.2012 6 ). Only the value of the critical force changes: instead of the short-term critical force of Euler, the concept of a long-term critical force is used, equal to the Euler force, divided by a coefficient that depends on the creep characteristics of concrete.…”

“…Numerous works of Russian and foreign scientists [1][2][3][4][5][6][7][8] are devoted to the problem of constructing a theory of reinforced concrete. Reinforced concrete, with enormous volumes of application and huge financial costs, due to the great complexity of its nonlinear properties, has a surprisingly unscientific theory of calculation, consisting of two parts: short-term and long-term loading.…”

Modelle zur Vorhersage des Schwindens und Kriechens von Beton – Teil 2a: Kriechen – Grundlagen und Analyse des Kriechmodells in DIN EN 1992‐1‐1:2011

“…Die für die Praxis relevanten und seit vielen Jahren bekannten betontechnologischen sowie umgebungs‐ und lastbedingten Einflussgrößen auf das Betonkriechen werden z. B. in [14, 15, 29] aufgeführt. Wichtige Einflussgrößen spiegeln sich auch in den verschiedenen Vorhersagemodellen wider (vgl.…”