FE-analysis of spacing of localized zones in reinforced concrete bars under tension using elasto-plasticity with non-local softening

Widuliński, Ł.; Bobiński, J.; Tejchman, J.

Artykuł - szczegóły

Tytuł artykułu

FE-analysis of spacing of localized zones in reinforced concrete bars under tension using elasto-plasticity with non-local softening

Autorzy

Widuliński Ł. , Bobiński J. , Tejchman J.

Wybrane pełne teksty z tego czasopisma

Identyfikatory

Warianty tytułu

Analiza MES rozstawu stref lokalizacji w rozciąganych żelbetowych prętach przy zastosowaniu sprężysto-plastyczności z nielokalnym osłabieniem

Języki publikacji

Abstrakty

The paper presents quasi-static 3D FE-simulations of strain localization in a reinforced concrete bar subjected to tension. The material was modeled with smeared continuum crack model using an elasto-plastic constitutive law. A Rankine criterion with isotropic softening and associated flow rule was adopted in a tensile regime of concrete. The behavior of reinforcement was described with an elasto-perfect plastic constitutive model. To ensure the mesh-independency, the model was enhanced in a softening regime by a non-local term to include a characteristic length of micro-structure. The FE-analyses were carried out with a different characteristic length, non-local parameter, reinforcement ratio, distribution of the tensile strength, bond between concrete and reinforcement, softening curve, softening rate and energy fracture.

Artykuł przedstawia quasi-statyczne trójwymiarowe symulacje MES lokalizacji odkształceń w żelbetowym pręcie poddanym rozciąganiu. Materiał był wymodelowany przy zastosowaniu kontynualnego modelu rys rozmytych i sprężysto-plastycznego konstytutywnego prawa. Przyjęto w obszarze rozciągania betonu kryterium Rankine'a z izotropowym osłabieniem i stowarzyszonym prawem płynięcia. Zachowanie zbrojenia zasymulowano sprężysto-idealnie plastycznym modelem konstytutywnym. W celu otrzymania wyników niezależnych od siatki MES, model został rozszerzony w osłabieniu o nielokalny składnik umożliwiający uwzględnienie długości charakterystycznej mikrostruktury. Analizy MES zostały wykonane dla różnej długości charakterystycznej, nielokalnego parametru, procentu zbrojenia, rozkładu wytrzymałości betonu na rozciąganie, kontaktu między betonem a zbrojeniem, krzywej osłabienia, spadku osłabienia oraz energii pękania.

Słowa kluczowe

finite element method strain localization crack tension reinforced concrete bar elasto-plasticity non-local softening FEM

metoda elementów skończonych lokalizacja odkształceń rysa rozciąganie pręt żelbetowy sprężysto-plastyczność osłabienie nielokalne

Wydawca

Komitet Inżynierii Lądowej i Wodnej PAN
Politechnika Warszawska, Wydział Inżynierii Lądowej

Czasopismo

Archives of Civil Engineering

Rocznik

2009

Tom

Vol. 55, nr 2

Strony

257--281

Opis fizyczny

Bibliogr. 48 poz., il.

Twórcy

autor

Widuliński Ł.

autor

Bobiński J.

autor

Tejchman J.

University of Technology, Faculty of Civil Engineering, Gdańsk, Poland, tejchman@pg.gda.pl

Bibliografia

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Bibliografia

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