Temat: Drucker-Prager - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A note on the differences between Drucker-Prager and Mohr-Coulomb shear strength criteria
Autorzy:: Wojciechowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/178873.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: Mohr-Coulomb
Drucker-Prager
elasto-plasticity
shear strength
plane strain conditions
Opis:: A systematic approach to measure the differences between Mohr-Coulomb (MC) and Drucker-Prager (DP) shear strength criteria used commonly in soil and rock mechanics is presented. It is shown that the DP criterion generates a shear strength between 0.6 and 3 times the MC strength, for the same friction angle and cohesion parameters. The appropriate conditions for obtaining equal shear strengths are given. Moreover, some new DP failure surfaces are proposed which minimize the differences relative to the MC predictions. The equivalence of the DP and MC criteria under plane strain conditions is also examined.
Źródło:: Studia Geotechnica et Mechanica; 2018, 40, 3; 163-169
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental verification of the developed soil model describing the propagation of vibration wave in the ground
Autorzy:: Bednarz, J.
Powiązania:: https://bibliotekanauki.pl/articles/246492.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
propagation of vibration wave in the soil
Drucker-Prager material model
Opis:: The problem of propagation of vibration waves in soil caused by passing trains and vehicles is an important issue for the assessment of their influence on environmental impacts and engineering structures such as bridges, viaducts, historic architecture and residential buildings. The issue is complex because the nature of the soil is heterogeneous and the groundwater level changing depending on the season and this creates great difficulties in developing a theoretical model of vibration wave propagation. The paper presents developed numerical model of soil consisting of 4.3 million cubic finite elements based on the geological properties of soil. Developed model based on Drucker- Prager material model, which is often used in numerical methods for simulating the behaviour of different soil types. In addition, the material properties of the soil was specially prepared and allowed to use them directly in the material model used. Both concrete (building) and steel (plate forcing) were modelled using an isotropic material model. Element size was set at 300 mm. This value was determined by the adopted frequency range studied (0 to 100 Hz) and due to verification by simulation results of experimental studies in which excitation has been implemented in the frequency of 33 Hz (base frequency of excitation signal) and 66 Hz (second harmonic of excitation signal). The cut-off frequency 100 Hz defines a minimum wavelength propagated in the soil (based on the stiffness and density of the soil) and 10 finite elements was adopted at a wavelength, which is 3 meters to the ground, for the correct mapping of a sinusoidal waveform. Subsequently, experimental studies were performed to verify the model from which the conclusions are presented in the work. The work was carried out in a research project 4875/B/TO2/2010/38 financed by Ministry of Science and Higher Education.
Źródło:: Journal of KONES; 2012, 19, 3; 31-39
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Impact of material nonlinearity of dam-foundation rock system on seismic performance of concrete gravity dams
Autorzy:: Ouzandja, Djamel
Messaad, Mokhtar
Berrabah, Amina Tahar
Belhrizi, Mohamed
Powiązania:: https://bibliotekanauki.pl/articles/2200865.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: concrete gravity dam
dynamic dam-foundation rock interaction
Drucker-Prager model
cracking
nonlinear earthquake analysis
finite element method
Opis:: This paper shows the impact of material nonlinearity of a dam-foundation rock system on seismic performance of Oued Fodda concrete gravity dam, located at northwestern side of Algeria. For the purpose, a three-dimensional dam-foundation rock system finite element model is employed in analyses. The hydrodynamic interaction between reservoir water and dam-foundation system is implicitly taken into consideration by the Westergaard approach using surface finite elements added to dam-fluid and foundation-fluid interfaces. The concrete material model is used to present the cracking of dam concrete under a seismic load the using smeared crack approach based on the Willam and Warnke failure criterion. The materially nonlinear analysis for both dam concrete and foundation rock is performed using Drucker- -Prager model. According to numerical results, tensile stresses and maximum strains reduce significantly in the materially nonlinear model. In addition, the cracking areas in the dam decrease also when material nonlinearity characteristics of the dam-foundation rock system is considered in analyses.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 49--63
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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