Naslov
Plastic-damage model for concrete in principal directions

Autori
Ananiev, Sergrj ; Ožbolt, Joško

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

Izvornik
FraMCoS-5 / Willam & Billington - Vail : FraMCoS, 2004, 271-278

Skup
FraMCoS-5

Mjesto i datum
Vail (CO), Sjedinjene Američke Države, 12.04.2004. - 16.04.2004

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
concrete; plasticity; damage; closest point projection

Sažetak
In the present paper a proposed plastic-damage model for concrete is discussed. Based on the fact that for isotropic materials elastic trial stress and projected plastic stress states have the same eigenvectors, loading surface is formulated in principal stress space rather than using invariants of stress tensor. In addition, it is assumed that the directions of orthotropic damage coincide with principal stress directions (in analogy to coaxial rotated crack model). Due to this assumption, the load surface and closest point projection algorithm can still be formulated in the principal directions. The formulation in principal stress space has the following advantages: (i) the order of polynomial representing loading surface can be increased in systematic way to fit experimental data, (ii) it is easy to identify the model parameters from uniaxial experiments, (iii) the polynomial form is automatically smooth, what simplifies closest point projection algorithm, (iv) plane stress formulation is achieved by simple setting of one principal stress to zero. The evolution of inelastic strain is determined, using maximum dissipation postulate. Damage and plastic parts of inelastic strain are separated using a scalar parameter, which is assumed stress dependent. Paper also discusses an effective numerical implementation. The performance of the model is demonstrated on few illustrative examples

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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