Partner: Jacek Tejchman

Gdańsk University of Technology (PL)

Ostatnie publikacje
1.Korol E., Tejchman J., Mróz Z., Experimental and numerical assessment of size effect in geometrically similar slender concrete beams with basalt reinforcement, ENGINEERING STRUCTURES, ISSN: 0141-0296, DOI: 10.1016/j.engstruct.2017.03.011, Vol.141, pp.272-291, 2017

Streszczenie:

The paper presents a comprehensive experimental and numerical analysis of slender rectangular reinforced concrete beams with longitudinal BFRP bars without shear reinforcement subjected to 3-point bending. The experiments included 4 different beams which were similar in two directions. The main research objective was to investigate the size effect on the nominal shear strength of beams. The detailed experimental analysis of beam strength, failure mode and cracking evolution was presented and compared with previous test results on beams reinforced by ordinary steel bears. The experiments with BFRP bars were numerically reproduced using the 2D finite element method based on a coupled elastic-plastic-damage formulation. In order to describe strain localization in concrete, a non-local constitutive model was applied with account for a characteristic length of micro-structure developing in the softening regime. The numerical results were in satisfactory agreement with the experimental data. Advantages and disadvantages of BFRP reinforcement in concrete beams were next outlined.

Słowa kluczowe:

BFRP bars, Concrete, Elastic-plastic-damage, Non-local softening, Shear, Size effect, Strain localization

Afiliacje autorów:

Korol E.-Gdańsk University of Technology (PL)
Tejchman J.-Gdańsk University of Technology (PL)
Mróz Z.-IPPT PAN
35p.
2.Syroka-Korol E., Tejchman J., Mróz Z., FE investigations of the effect of fluctuating local tensile strength on coupled energetic-statistical size effect in concrete beams, ENGINEERING STRUCTURES, ISSN: 0141-0296, DOI: 10.1016/j.engstruct.2015.09.011, Vol.103, pp.239-259, 2015

Streszczenie:

The effect of fluctuating local tensile strength on a coupled energetic–statistical size effect in plain concrete beams under bending was numerically investigated. First, the influence of varying autocorrelation length of the random field describing a spatial variation of local tensile strength was studied. Next, the influence of the coefficient of variation of local tensile strength was analyzed. The numerical FE investigations were performed for unnotched concrete beams of similar geometry under quasi-static three point bending within elasto-plastic model assumptions, accounting for non-local softening. The FE analyses were carried out for four different beam sizes. In the calculations, the tensile strength took the form of spatially correlated random field described by a Gaussian distribution.

Słowa kluczowe:

Autocorrelation length, Concrete beam, Elasto-plasticity, Non-local softening, Random field, Size effect, Strain localization, Tensile strength

Afiliacje autorów:

Syroka-Korol E.-Gdańsk University of Technology (PL)
Tejchman J.-Gdańsk University of Technology (PL)
Mróz Z.-IPPT PAN
35p.
3.Syroka-Korol E., Tejchman J., Mróz Z., FE analysis of size effects in reinforced concrete beams without shear reinforcement based on stochastic elasto-plasticity with non-local softening, FINITE ELEMENTS IN ANALYSIS AND DESIGN, ISSN: 0168-874X, DOI: 10.1016/j.finel.2014.05.005, Vol.88, pp.25-41, 2014

Streszczenie:

The paper presents results of FE analysis of mechanical size effects in longitudinally reinforced concrete slender beams without shear reinforcement failing in shear mode. The simulations were performed under plane stress conditions for three beams of different sizes and a fixed shape (height/length ratio). The attention was focused on deterministic and statistical size effects related to the nominal beam shear strength. Concrete was assumed as an isotropic elasto-plastic material exhibiting non-local softening. The bond strength between concrete and reinforcement was assumed to depend on interface slip with both stable and softening responses. Statistical simulations were performed for spatially correlated Gaussian random fields of tensile strength using a stratified sampling reduction method. The FE numerical results were compared with the respective own experimental test results.

Słowa kluczowe:

Elasto-plasticity, Non-local softening, Random fields, Reinforced concrete beams, Size effect, Strain localization

Afiliacje autorów:

Syroka-Korol E.-Gdańsk University of Technology (PL)
Tejchman J.-Gdańsk University of Technology (PL)
Mróz Z.-IPPT PAN
35p.
4.Syroka-Korol E., Tejchman J., Mróz Z., FE calculations of a deterministic and statistical size effect in concrete under bending within stochastic elasto-plasticity and non-local softening, ENGINEERING STRUCTURES, ISSN: 0141-0296, DOI: 10.1016/j.engstruct.2012.09.013, Vol.48, pp.205-219, 2013

Streszczenie:

The numerical FE investigations of a deterministic and statistical size effect in unnotched concrete beams of similar geometry under quasi-static three point bending were performed within elasto-plasticity with non-local softening. The FE analyses were carried out with four different beam sizes. Deterministic calculations were performed with the uniform distribution of a tensile strength. In turn, in statistical 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 statistical realizations without losing the calculation correctness, Latin hypercube sampling was applied. The numerical outcomes showed a strong coupled deterministic and stochastic size effect which was compared with the size effect laws by Bazant and by Carpinteri.

Słowa kluczowe:

Concrete beam, Elasto-plasticity, Latin hypercube sampling, Non-local softening, Stochastic fields, Size effect, Strain localization, Tensile strength

Afiliacje autorów:

Syroka-Korol E.-Gdańsk University of Technology (PL)
Tejchman J.-Gdańsk University of Technology (PL)
Mróz Z.-IPPT PAN
40p.
5.Kozicki J., Tejchman J., Mróz Z., Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static homogeneous triaxial compression using DEM, GRANULAR MATTER, ISSN: 1434-5021, DOI: 10.1007/s10035-012-0352-1, Vol.14, pp.457-468, 2012

Streszczenie:

A quasi-static homogeneous drained triaxial compression test on cohesionless sand under constant lateral pressure was simulated using a three-dimensional DEM model. Grain roughness was modelled by means of symmetric clusters composed of rigid spheres imitating irregular particle shapes. The effect of grain roughness on shear strength, dilatancy, kinetic, elastic and dissipated energies was numerically analyzed. Some numerical results were compared with available experimental results.

Słowa kluczowe:

Triaxial test, Granular material, Discrete element method, Grain roughness, Energy, Dissipation

Afiliacje autorów:

Kozicki J.-Gdańsk University of Technology (PL)
Tejchman J.-Gdańsk University of Technology (PL)
Mróz Z.-IPPT PAN
30p.