1,720,983 research outputs found
Sul comportamento di elementi bidimensionali in conglomerato, armati lungo una sola direzione e soggetti a stati piani di sforzo
No full textIl controllo della qualità della biomassa nelle centrali di trasformazione energetica: caso applicativo
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Experimental and numerical assessment of flexural and shear behaviour of precast prestressed deep hollow-core slabs
Full text linkThe paper presents the results of flexural and shear tests up to failure on full-scale specimens having a depth of 500 mm. A detailed non-linear 2D finite element model is also developed to predict the stress distribution and crack pattern within the slab, providing a well match with experimental results. Experimental and numerical results are compared with analytical calculations provided by Product Standard EN 1168, highlighting the inaccuracy of technical regulations in predicting shear behavior. The proposed numerical procedure is instead viable and sound for the design and the strength assessment of HCS, and can be extended easily to the analysis of whole floor systems
Effect of high temperatures on the behavior of concrete tunnel linings: a numerical study
No full textIn this work, the performance of concrete tunnel linings subjected to high temperatures is assessed by performing 3D FE simula-tions. The analyses account for all the different stages of lining construction and use, from its installation, to its service life, to the possible spreading of fire. In order to realistically represent the soil excavation phase and the subsequent lining installation, a step-by-step procedure is followed, whereas a sequentially coupled thermo-mechanical procedure is applied for the fire stage. The behavior of concrete subjected to high temperatures is described by using the non-linear constitutive model “2D-PARC FIRE”. This model considers all the main features governing concrete behavior (i.e. cracking, crushing, shrinkage, creep and time-dependency of concrete mechanical properties) by also including the effects of thermal strains and the degradation of material properties due to fire
Effetti della posizione del carico nella progettazione delle pavimentazioni industriali in SFRC
No full textEvaluation of the response of concrete tunnel linings subjected to fire: a three-dimensional approach
No full textThis work is focused on the development of a refined nonlinear constitutive model for the analysis up to failure of concrete elements subjected to fire, able to account the main features governing concrete be-havior, i.e. cracking and crushing. In particular, the model is applied to the structural assessment of unreinforced concrete tunnel linings in order to deal with all the different stages of tunnel life, from its construction to its service conditions, also taking into account the possible development of a fire and its effects on the lining system. The reliability and accuracy of the proposed model are checked against analytical closed-form solutions
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