On some problems in determining tensile parameters of concrete model from size effect tests

• Autorzy: Marzec Ireneusz , Bobiński Jerzy

Identyfikatory

DOI

10.2478/pomr-2019-0031

• Języki publikacji: EN

Abstrakty

EN

The paper presents results of numerical simulations of size effect phenomenon in concrete specimens. The behaviour of in-plane geometrically similar notched and unnotched beams under three-point bending is investigated. In total 18 beams are analysed. Concrete beams of four different sizes and five different notch to depth ratios are simulated. Two methods are applied to describe cracks. First, an elasto-plastic constitutive law with a Rankine criterion and an associated flow rule is defined. In order to obtain mesh independent results, an integral non-local theory is used as a regularisation method in the softening regime. Alternatively, cracks are described in a discrete way within Extended Finite Element Method (XFEM). Two softening relationships in the softening regime are studied: a bilinear and an exponential curve. Obtained numerical results are compared with experimental outcomes recently reported in literature. Calculated maximum forces (nominal strengths) are quantitatively verified against experimental values, but the force – displacement curves are also examined. It is shown that both approaches give results consistent with experiments. Moreover, both softening curves with different initial fracture energies can produce similar force-displacement curves.

Słowa kluczowe

EN

concrete; size effect; fracture energy; elasto-plasticity; XFEM

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2019
• Tom: nr 2
• Strony: 115--125
• Opis fizyczny: Bibliogr. 30 poz., rys.

Twórcy

autor

Marzec Ireneusz

• Gdansk University of Technology Narutowicza 11/12, 80-233 Gdańsk Poland

autor

Bobiński Jerzy

• Gdansk University of Technology Narutowicza 11/12, 80-233 Gdańsk Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).