Papers by Antonio michele Tralli
Archives of Computational Methods in Engineering, 2019
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XVII Congresso AIMeTA, 2005
In the present work the problem of thin surface coatings of an elastic layer subject to a residua... more In the present work the problem of thin surface coatings of an elastic layer subject to a residual thermal stress is analytically investigated. The system adopts a curvature as a result of the misfit strain due to the different thermal expansivities of the layer and coatings. The problem is governed by a singular integral equation which can be reduced to a linear algebraic system by approximating the unknown interfacial shear stress via series expansion of Chebyshev polynomials. The present analysis is developed in order to assess the mechanical behaviour of a crystalline undulator designed for obtaining high emission radiations through channelling phenomeno
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Nel presente lavoro vengono presentati alcuni modelli analitici sviluppati per descrivere la comp... more Nel presente lavoro vengono presentati alcuni modelli analitici sviluppati per descrivere la complessa interazione dinamica fra il terreno e una paratia incastrata alla base. A differenza dei metodi pseudostatici, suggeriti dagli Eurocodici, i modelli sviluppati consentono di tenere conto della effettiva rigidezza della paratia, delle proprietà elastiche e di permeabilità del terreno ed inoltre di simulare il comportamento dinamico dell’insieme terreno-opera di sostegno in presenza di una forzante comunque variabile nel tempo, applicando la trasformata discreta di Fourier (D.F.T.). La risposta dinamica dell’opera viene modellata con riferimento a due diversi tipi di terreno, tipici dei siti alluvionali interessati dal progetto della Idrovia Ferrarese (Lanzoni et al., 2005); l’uno di tipo limo-argilloso con bassa permeabilità per cui viene considerata una equazione costitutiva di tipo visco-elastico, l’altro per i terreni a grana grossa con elevata permeabilità per cui viene sviluppa...
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This paper presents a critical review of several analytical and numerical models that may be adop... more This paper presents a critical review of several analytical and numerical models that may be adopted for studying the out-of-plane behaviour of masonry structures having regular texture, with particular attention to the case of historical masonry, that is characterized by rigid blocks connected by mortar joints modelled as elastic interfaces. Discrete model, Love-Kirchhoff and Reissner-Mindlin plate models and a full three-dimensional heterogeneous finite element model are considered. The elastic parameters of both plate models are based on an existing compatible identification between a three-dimensional discrete model and two-dimensional plate models. Numerical tests are carried on by defining four case studies and paying attention to an in-plane scale factor, representing the size of heterogeneity of the masonry pattern, and to an out-of-plane scale factor, representing the thickness of the structure. Numerical tests show that the existing discrete model is simple and effective for representing masonry behaviour, especially when the magnitude of the heterogeneity is large with respect to the overall size of the panel. Increasing the in-plane scale factor, both plate models converge to the discrete one, but the Reissner-Mindlin plate model shows a better convergence and also allows the adoption of a simple plate finite element for performing numerical analysis
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ABSTRACT
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American Journal of Engineering and Applied Sciences, 2016
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Journal of Engineering Mechanics, 2017
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Engineering Structures, 2016
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ABSTRACT Continuum micro-polar models are employed for modeling masonry based on a compatible ide... more ABSTRACT Continuum micro-polar models are employed for modeling masonry based on a compatible identification procedure. The sensitivity of micro-polar models to the representative elementary volume (REV) chosen is discussed, moreover a discrete element model is proposed to verify reliability of several micro-polar solution. The discrete model allows to verify the influence of micro-rotations in masonry wall behavior. A comparison between discrete and F.E. Model in which constitutive functions are obtained from identification procedure is presented in some meaningful cases.
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ABSTRACT
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ABSTRACT
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Rivista Italiana di …, 2005
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Journal of Engineering Mechanics, 2005
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International Journal of Engineering Science, 2008
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International Journal of Architectural Heritage, 2012
In the present paper, a comparative numerical study on a 12 century masonry tower located in the ... more In the present paper, a comparative numerical study on a 12 century masonry tower located in the northern Italy is described. To assess the safety of the tower under seismic loads, different numerical analyses have been performed: non-linear static, limit and non-linear full dynamic analyses. In the first two cases, a full 3D detailed FE model is adopted, changing the seismic load direction and assuming different hypotheses for the interconnection between the core and the external walls. When dealing with the FEM incremental analysis, a commercial code is utilized assuming for masonry a smeared crack isotropic model. For limit analysis, a non-commercial full 3D code developed by the authors is utilized. It provides limit good estimates of limit loads and failure mechanisms, to compare with standard FEM results. The dynamical analyses have been performed by a specific 2D RBSM (Rigid Body and Spring Model), accounting for the asymmetries along the thickness and the irregularities changes of thickness of both the external and internal walls in an approximate but realistic way. Four different accelerograms are utilized –passing from low to high seismicity zones- to evaluate the performance of the tower under dynamic loads. From numerical results, the role played by the actual geometry of the tower is envisaged, as well as a detailed comparison of failure mechanisms provided by the incremental FEM and limit analysis is provided. In all cases, the numerical analysis has given a valuable picture of possible damage mechanisms providing useful hints for the introduction of structural monitoring.
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Papers by Antonio michele Tralli