08.53: Integral analysis of steel concrete beams, Regarding creep of concrete according EC2, versus (AAEMM) of bažant

Abstract

The paper presents analysis of the stress-strain behaviour due to creep in statically determinate composite steel-concrete beam according to AAEM method of Bažant in comparison with numerical method. The analysis is based on the results obtained by numerical solution with Volterra integral equations derived for determining the redistribution of stresses in beam section between concrete plate and steel beam with respect to time "t" and creep of concrete according EC2 provisions. On the basis of the theory of the viscoelastic body of Arutyunian-Trost-Bažant it is analysed the migration of stresses from concrete plate to steel beam using two independent Volterra integral equations of the second kind and two independent algebraic equations, during the period of 70 years. The closeness of the results obtained by the two methods is shown with an example from the bridge practice.