Naslov
A numerical model of a prestressed concrete girder

Autori
Galić, Mirela ; Marović, Pavao ; Ravlić, Ivan

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 2016 International Conference on High Performance and Optimum Design of Structures and Materials – HPSM/OPTI 2016 / Hernandez, S. ; Brebbia, Carlos ; de Wilde, P. - Southampton : Wessex Institute of Technology Press, 2016, Gmr-1

ISBN
978-1-78466-144-1

Skup
International Conference on High Performance and Optimum Design of Structures and Materials – HPSM/OPTI 2016

Mjesto i datum
Siena, Italija, 19.09.2016. - 21.09.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
numerical modelling; prestressed concrete structures; prestressed tendon; non-linear behaviour; reinforcement

Sažetak
The paper briefly describes a three-dimensional (3D) numerical model for describing non-linear behaviour of prestressed concrete structures. A computational analysis of reinforced and prestressed concrete structures requires a realistic material model and an accurate description of the geometry of reinforcement, prestressed tendons and concrete in order to predict their behaviour and evaluate the safety levels of the design. The definition of this kind of model requires a good mathematical formulation and numerical interpretation, which is shown in this paper. The non-linear behaviour of concrete is described by an elasto-plastic material model based on the modified Mohr-Coulomb law for dominant compression stresses and the modified Rankine law for dominant tensile stresses. A multi-surface presentation of the model is implemented, thus permitting a rapid convergence of the mathematical procedure. The model accounts for the triaxial, non-linear behaviour of concrete and includes all dominant effects on concrete such as yielding in compression, cracking in tension, softening and hardening. The model is defined by elementary material parameters (Young’s modulus, Poisson’s coefficient, maximal uniaxial tensile and compression stresses, coefficient of tensile correction, maximal tensile and maximal compression strains). The non-linear behaviour of prestressed tendons is described by a one-dimensional (1D) elasto-viscoplastic model. The tendon element geometry is described by a second order space function which is determined by its projections. These elements allow the modelling of arbitrarily curved prestressing tendons in space, thus they can be determined independently of a 3D finite element concrete mesh. This is particularly important for the space curvature of prestressed tendons. Some possibilities of the model are illustrated by a practical example and the obtained results are compared with the known numerical and experimental ones.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

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