Numerical studies on size effects in concrete beams

• Autorzy: Syroka-Korol E. , Tejchman J.
• Języki publikacji: EN

Abstrakty

EN

The numerical FE investigations of a deterministic and stochastic size effect in unnotched concrete beams of similar geometry under three point bending were performed within elasto-plasticity with non-local softening. Deterministic calculations were performed with the uniform distribution of a tensile strength. In turn, in stochastic calculations, the tensile strength took the form of spatially correlated random fields described by a truncated Gaussian distribution. In order to reduce the number of stochastic realizations without losing the calculation correctness, Latin hypercube sampling was applied. The numerical outcomes were compared with the size effect laws by Bazant.

PL

Przeprowadzono analizę numeryczną MES deterministycznego i statystycznego efektu skali w belkach betonowych geometrycznie podobnych poddanych 3-punktowemu zginaniu. Zastosowano sprężysto-plastyczny model betonu z nielokalnym osłabieniem. Obliczenia deterministyczne wykonano z jednorodnym rozkładem wytrzymałości na rozciąganie. Symulacje stochastyczne przeprowadzono z wykorzystaniem przestrzennie skorelowanych pól losowych opisanych obciętym rozkładem Gaussa. W celu zredukowania liczby symulacji stochastycznych, przy zachowaniu poprawności obliczeniowej, zastosowano metodę próbkowania typu sześcianu łacińskiego. Wyniki numeryczne zostały porównane z prawem efektu skali wg Bazanta.

Słowa kluczowe

EN

concrete beam; elasto-plasticity; Latin hypercube sampling; non-local softening; random field; size effect; strain localization

PL

belka betonowa; sprężysto-plastyczność; próbkowanie typu sześcianu łacińskiego; osłabienie nielokalne; pole losowe; efekt skali; lokalizacja odkształcenia

• Wydawca: Silesian University of Technology
• Czasopismo: Architecture Civil Engineering Environment
• Rocznik: 2012
• Tom: Vol. 5, no. 2
• Strony: 67--78
• Opis fizyczny: Bibliogr. 36 poz.

Twórcy

autor

Syroka-Korol E.

autor

Tejchman J.

• Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, Poland,

Bibliografia

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