Bending assignation for reinforced concrete beams in the long-time process considering the impact of creep contraction and impact of reinforcement percentage

Abstract

Main factors that impact creep and shrinkage of concrete as well as the impact of so called “creep and shrinkage in static systems”, basic hypothesis of linear theories of the creep of concrete. There are described main hypothesis on the concrete characteristics, it is given also the description on the status of deformation-strain, relation of the creep and relaxing according to EC-2, phenomena which are presented in figures as well as it is given the basic rheology relation according to the McHenry principle as well as the tangential module of concrete elasticity in the case of oldness “t0”, Ec(t0) according to EC-2, CEB-FIB’78, ACI and according to the regulation of former Yugoslavia where it is described in details: theory of oldness, theory of inheriting of elasticity and theory of inheritance-oldness. Determination of inclination for reinforced concrete during time having in mind the creep and shrinkage, creep and impact of concreting percentage. The calculations are made with these methods: - Numerical integration method - Bilinear method first case - Bilinear method second case - According to Eurocode-2