Evaluation of the structural response to the time-dependent behaviour of concrete: Part 2 - A general computational approach

The paper presents an integral-type general computational approach for the analysis of structural effects of timedependent behaviour of concrete, with particular regard to creep, based on the coupling of the finite elements method with a numerical solution of the hereditary Volterra integral equations of aging linear viscoelasticity ensuing from the application of the linear principle of superposition. This approach does not require the conversion to a rate-type form of the integral-type viscoelastic creep constitutive law adopted by most of current creep prediction models. Simple and complex structures (as non-homogenous structures realized through sequential construction procedures), can be modelled through the adoption of this general numerical approach. Two examples of application, relative to a cable-stayed bridge and to a multi-storey building, are presented.