203 research outputs found
Analisi degli effetti tensionali indotti da incendio su strutture tridimensionali di acciaio, ricoperte con materiale isolante
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Un nuovo metodo per la generazione automatica diretta delle funzioni di forma per elementi serendipity rettangolari
No full textNon linear analysis of R/C shear walls subjected to seismic loadings
No full textA robust model is proposed for the nonlinear analysis of R/C shear walls under cyclic seismic loadings. The attention is focused on developing the R/C membrane element for two-dimensional problems and the R/C plate element for three-dimensional ones. The reinforcing bars are modelled as multiple smeared steel layers with uniaxial stress-strain response. At this stage of the research the bond-slip between concrete and rebars is not taken into account. An isotropic plastic-damage constitutive law developed by some of the authors is used to simulate the concrete behaviour. The two damage parameters are profitably employed for detecting the damage state of the structures and for interpreting their inelastic response.
The model is validated by comparison with several experimental results on R/C panels and shear walls from the literature. The chosen examples demonstrate the ability of the model in reproducing both flexural and shear failures. The tests are carried out in quasi-static conditions. The accuracy of the model in reproducing the cyclic behaviour of R/C members is notable
La modellazione numerica delle strutture della basilica e le verifiche di stabilità e di vulnerabilità sismica
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Experimental investigation and numerical modeling of carbonation process in reinforced concrete structures - Part II practical applications
No full textThe Blatz-Ko material model and homogenization
No full textA hyperelastic constitutive model for compressible materials undergoing large deformations is introduced from the evaluation, by homogenization, of the strain energy density function of periodic porous rubber composites. For infinitesimal deformations the proposed material model remains unidentifiable from the Blatz-Ko one, but it is shown that, at higher stretching levels, these models differ substantiall
Derivation of hyperelastic incompressible material constitutive tensor within a total lagrangian framework
No full textA tridimensional non-linear elastic constitutive relationship of the hyperelastic incompressible materials is derived from the Mooney-Rivlin strain energy density function. This works within large displacement theory, in the total Lagrangian formulation. Several applications, referring to the implementation in a non-linear computer code, are also described
Studio della risposta sismica di sistemi terreno-struttura con il metodo degli elementi finiti
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