IRIS - UNIRSM (Univ. degli Studi della Repubblica di San Marino)
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Dynamic stability of doubly-curved multilayered shells subjected to arbitrarily oriented angular velocities: Numerical evaluation of the critical speed
No full textThe paper is focused on the evaluation of the critical speed of rotating doubly-curved multilayered shell structures. The theoretical framework developed to this aim is based on a general formulation capable to define several Higher-order Shear Deformation Theories (HSDTs) in a unified manner. The current approach can deal easily with angular velocities applied about a generic axis of the structure. This aspect represents a clear advancement with respect to the formulations available in the literature, which are developed mainly to investigate the dynamic behavior of rotating shells of revolution (disks, circular cylinders and conical shells), in which the angular velocity is applied about their revolution axis. It is important to underline that the effects of both Coriolis and centripetal accelerations on the dynamic response of shell structures, characterized by various geometric shapes, are included in the model. The quadratic eigenvalue problem that lies behind the free vibration analysis in hand is solved numerically by means of the well-known Generalized Differential Quadrature (GDQ) method. The critical speed is obtained as a result of many parametric investigations, which are defined for increasing values of the applied angular velocities. Finally, it should be mentioned that the current research falls within the aim of the study of the dynamic stability of rotating structures. For this purpose, several considerations concerning the flutter and divergence phenomena are presented
Full-scale experimental assessment of the dynamic horizontal behavior of micropiles in alluvial silty soils.
No full textStefano Pivato, Sia lodato Bartali. Il mito di un eroe del Novecento, Roma Castelvecchi, 2018
No full textOSAS : valutazione della patologia e patente professionale
No full textLa sindrome delle apnee ostruttive del sonno è una patologia che colpisce indistintamente maschi e femmine.
La OSAS (Obstructive Sleep Apnea Syndrome) è determinata da
episodi ripetuti di ostruzione parziale o completa
delle vie aeree superiori.
I disturbi del sonno non solo si ripercuotono negativamente sulla salute e sulla qualità della vita di chi ne
soffre, ma aumentano anche i rischi sulle strade.
Il 19 febbraio 2016 è stato pubblicato sulla Gazzetta Ufficiale n. 41 il d
ecreto
dirigenziale 3
febbraio
2016 del Ministero della Salute, che fornisce gli indirizzi medico
-legali da osservare per l’accertamento dell’idoneità
psico
-fisica alla guida per coloro che sono affetti, o che si sospetta possano essere affetti, da OSAS
L’identità autorevole. Il progetto d’identità visiva degli Istituti culturali di San Marino
No full textIl contributo vuole approfondire il ruolo che il design strategico
può rivestire nei processi di valorizzazione del patrimonio
culturale in un piccolo contesto territoriale come San
Marino, in cui istituzioni quali i Musei di Stato convivono,
all’interno di un ristretto spazio turistico, con un’offerta
pseudo-culturale e vernacolare di carattere sensazionalistico
proposta da realtà museali private. Considerando la
mancanza di una riconoscibile strategia comunicativa dei
musei statali come una vera e propria sottrazione di autorevolezza,
si è ragionato sull’importanza del progetto di identità
visiva come strumento in grado sia di conferire prestigio
e visibilità al sistema museale statale che di attivare un
progetto sinergico tra le varie realtà culturali del territorio
Local site effects and incremental damage of buildings during the 2016 Central Italy earthquake sequence
No full textMechanical behavior of damaged laminated composites plates and shells: Higher-order Shear Deformation Theories
No full textThe paper aims to present a novel mathematical formulation for the modelling of damage. In particular, the decay of the mechanical properties of the elastic media is modeled by means of two-dimensional smooth functions, which are the Gaussian and the ellipse shaped ones. Various damaged configurations are obtained as concentrated variations of the elastic properties of the materials by setting properly the parameters that define the distributions at issue. This approach is employed to investigate the dynamic behavior of damaged plates and shells made of composite materials. In particular, a massive set of parametric studies is presented for this purpose. The results are obtained numerically by means of the Generalized Differential Quadrature (GDQ) method and are presented in terms of natural frequencies. Several Higher-order Shear Deformation Theories (HSDTs), which can include also the Murakami’s function to capture the so-called zig-zag effect, are used and compared
Strong and weak formulations based on differential and integral quadrature methods for the free vibration analysis of composite plates and shells: Convergence and accuracy
No full textThe aim of this work is to investigate and compare the accuracy and convergence behavior of two different numerical approaches based on Differential Quadrature (DQ) and Integral Quadrature (IQ) methods, respectively, when applied to the free vibration analysis of laminated plates and shells. The numerical methods at issue allow to solve the strong and the weak forms of the governing equations of these structural elements. A completely general approach is presented to evaluate numerically derivatives and integrals by using several basis functions (polynomial approximation) and grid distributions (discretization). The convergence analyses are performed for three different approaches: Strong Formulation (SF), Weak Formulation (WF) with C1 continuity conditions, and Weak Formulation (WF) with C0 continuity conditions. For each approach, a set of convergence graphs is shown, by varying both basis functions and discrete grids, in order to define the combinations that provide the best accuracy with reference to the exact solutions available in the literature
