Nosa 2011
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Nosa 2011

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    Nosa 2011 Nosa 2011 Presentation Transcript

    • Istituto di Scienza e Tecnologie dell’Informazione “A. Faedo” THE FINITE ELEMENT CODE NOSA FOR NONLINEAR STRUCTURAL ANALYSISMaterial modelsELASTICITY: static and dynamic analysisCOMPOSITE: shell and beam elements have layers with differentmechanical and thermal propertiesELASTO-PLASTICITY: static and dynamic analysisMASONRY-LIKE: static and dynamic analysisHEAT TRANSFER
    • Element library of the NOSA codeStructural type Element Interpolating Remarks identifier functions number3D element 1 quadratic 20 nodes isoparametric elementPlane stress 2 quadratic 8 nodeselement isoparametric elementPlane strain 3 quadratic 8 nodeselement isoparametric elementAxisymmetric 4 quadratic 8 nodeselement isoparametric elementThin shell 5 Linear for 8 nodeselement displacements, isoparametric quadratic for element rotations
    • Structural type Element Interpolating Remarks identifier functions numberPlane strain 6 linear 4 nodeselement isoparametric elementAxisymmetric 7 linear 4 nodeselement isoparametric element3D element 8 linear 8 nodes isoparametric elementStraight beam 9 linear 2 nodeselement isoparametric elementThick shell 10 Linear for 4 nodeselement displacements isoparametric and rotations element
    • Structural type Element Interpolating Remarks identifier functions numberPlane heat 11 quadratic 8 nodestransfer isoparametricelement elementPlane heat 12 linear 4 nodestransfer isoparametricelement elementAxisymmetric 13 quadratic 8 nodesheat transfer isoparametricelement elementAxisymmetric 14 linear 4 nodesheat transfer isoparametricelement element3D heat 15 linear 8 nodestransfer isoparametricelement element
    • Flow-chart for NOSA (nonlinear static analysis)
    • THE FINITE ELEMENT CODE NOSA FOR THE STRUCTURAL ANALYSIS OF HISTORIC MASONRY CONSTRUCTIONSStatic and dynamic analysisLimit analysisThermo-mechanical analysis of masonry structures subjected to thermal variationsModelling of strengtheningoperations (fitting of metallicBeams and rings, retaining structures, etc.)
    • NOSA has been successfully applied to the analysis of somebuildings of historical and architectural interest: The baptistery of the Volterra cathedral (1995) The stress field in the dome has been calculated with the aim of assessing the effectiveness of the existing metallic rings. The finite element mesh
    • The Medici Arsenal, Pisa (1996)The study is aimed at determining the staticbehaviour of the structure dating back to theXIII century and constituted by twelve series ofarches. In particular, some strengtheninginterventions have been modelled and comparedin order to assess their effects on the staticsafety and seismic resistence of theconstruction. The arches of the Arsenal
    • The Goldoni theatre, Livorno (1998) The static behaviour of the scenic arch has been assessed.
    • The S. Nicolò cathedral, Noto (1998)The static behaviour of the rightlongitudinal wall of the nave has beenanalysed with the aim of determining theeffects of differential settling of thepillars. The longitudinal wall
    • The Buti bell tower (2004) A static analysis of the bell tower subjected to its own weight and a horizontal load simulating a seismic action has been conducted with the aim of determining the origins of the cracks. Crack distribution in the tower
    • The church of San Pietro in Vinculisa, Pisa (2003) The right longitudinal wall of the wall has been analysied with the aim of assessing the effect of differential settlings of the pillar on the stress field and crack distribution . Crack distribution in a longitudinal wall
    • The church of Santa Maria Maddalena, Morano Calabro (2004-2005) A static analysis of the dome and the drum has been conducted with the aim of assessing the effects of both differential settlings of the drum and a horizontal load on the stress field and crack distribution in the dome. Crack distribution in the dome
    • The church of San Ponziano, Lucca (2005, 2007) Static and dynamic analyses of the cross vault overlooking the altar have been conducted by taking the presence of the metallic tie-rods into account. Finite element discretization of the vault
    • The church of Santa Maria della Roccella, Roccelletta Borgia (2009) The study aims at analyse the sesimic vulnerability of the structure and take into account the regulations provided by the Ministry of Cultural Heritage in 2007 concerning the assessment and reduction of the seismic risk of the historical buildings. Dynamic analysis of the church
    • The Rognosa tower, San Gimignano (2008-2011)The study concerns the static behaviour and theseismic vulnerability of the Rognosa tower, added tothe Unesco World Heritage List in 1990. Thebehaviour of the tower subjected to its own weightand an accelerogram recorded during a realearthquake, is investigated.
    • The tower of the Hours, Lucca (2010)The analysis aims at assessingthe dynamic beaviour of thetower in the presence of time-dependent loads modellingseismic actions. Finite element discretization of the tower
    • - The finite element code NOSA allows:- to determine the static and dynamic behaviour of masonry buildings- to model strengthening interventions and assess their effectivenessbefore implementationTherefore, NOSA can be used in the field of maintenanceand safeguarding of the national architectural heritage toassess the safety of artistically important masonrybuildings and to optimise potential maintenance andstrengthening operations in terms of architectural impactand static effectiveness.COMES-NOSA is a freeware version of NOSA for the nonlinear staticanalysis of masonry buildingshttp://www.isti.cnr.it/research/unit.php?unit=MMS&section=software