0000000000481052

AUTHOR

Marzia Malavisi

showing 4 related works from this author

Definition of a fiber macro-model for nonlinear analysis of infilled frames

2017

A common way to model infill-frame interaction is the use equivalent strut macromodels. In most cases these are compression only resistant truss elements defined with a multi-linear axial-force / axial-displacement law. The main difficulty in using this approach is to correctly calibrate such a force-displacement curve (slope of ascending and post-peak branches, critical yielding, peak and residual forces) because of the large number of variables (mechanical and elastic properties of materials) and the different possible damage mechanisms activated for the frame-infill system. Another possible way is using fiber-section elements as diagonal struts. In this case the force-displacement law is…

Infilled framesComputer scienceCorrelations; FEM; Fiber-section elements; Infilled frames; Macromodelling; Micromodelling; Stress-strain; Computational Mathematics; Computers in Earth Sciences; Geotechnical Engineering and Engineering GeologyStress-strainComputers in Earth SciencesA fibersMacroMicromodellingFEMCorrelationsbusiness.industryStress–strain curveComputational mathematicsStructural engineeringGeotechnical Engineering and Engineering GeologyFiber-section elementFinite element methodCorrelationInfilled framesComputational MathematicsNonlinear systemSettore ICAR/09 - Tecnica Delle CostruzionibusinessFiber-section elementsInfilled frameMacromodelling
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Optimal design algorithm for seismic retrofitting of RC columns with steel jacketing technique

2020

Abstract Steel jacketing (SJ) of beams and columns is widely employed as retrofitting technique to provide additional deformation and strength capacity to existing reinforced concrete (RC) frame structures. The latter are many times designed without considering seismic loads, or present inadequate seismic detailing. The use of SJ is generally associated with non-negligible costs depending on the amount of structural work and non-structural manufacturing and materials. Moreover, this kind of intervention results in noticeable downtime for the building. This paper presents a new optimization framework which is aimed at obtaining minimization of retrofitting costs by optimizing the position an…

Optimal design0209 industrial biotechnologyDowntimeComputer scienceOpenSEESSeismic loadingsteel jacketing02 engineering and technologyIndustrial and Manufacturing EngineeringEngineering optimizationSettore ICAR/09 - Tecnica Delle Costruzioni020303 mechanical engineering & transports020901 industrial engineering & automationOpenSees0203 mechanical engineeringArtificial IntelligenceconfinementGenetic algorithmRetrofittingSeismic retrofitconfinement; OpenSEES; optimization; steel jacketing; stress-strain curvestress-strain curveAlgorithmoptimization
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Out of plane fragility of infill walls with and without prior in-plane damage

2019

The paper presents the results of a probabilistic assessment framework aimed at evaluating out-of-plane fragility curves of infill walls which have suffered (or not) prior in-plane damage. Out-of-plane incremental dynamic analyses are performed based on a suite of 22 ground motion records. A recently developed in-plane / out-of-plane macroelement model is used to model masonry infills within frames. The outcomes show fragility curves representing the probability of exceeding out-of-plane collapse at a given earthquake intensity as a function of a different combination of geometrical and mechanical parameters, in-plane damage level and supporting conditions.

Settore ICAR/09 - Tecnica Delle CostruzioniIncremental Dynamic Analysis Fragility Curves Masonry Infilled Frames Reinforced concrete
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EVALUATION OF FRAGILITY OF INFILLED FRAME STRUCTURES SUBJECT AFTERSHOCKS BY MEANS OF DOUBLE INCREMENTAL DYNAMIC ANALYSIS APPROACH

2018

The paper investigates the role of masonry infill walls on the seismic fragility of reinforced concrete structures subject to mainshock/aftershock sequences. An assessment framework aimed at determining aftershock fragility curves of bare frames and infilled frames is presented. The framework is based on a Double Incremental Dynamic Analysis (D-IDA) approach, which provides the adoption of ground motions defined by combining a fixed intensity mainshock with a set of variable intensity aftershocks. Mainshock (MS) intensity is scaled several times and combined with the same set of aftershocks (AS). Chord-rotation and shear limit states are specifically defined to consider the influence of mas…

Masonry Infilled FramesReinforced concreteSettore ICAR/09 - Tecnica Delle CostruzioniOpenSeesFragility CurveIncremental Dynamic Analysis; Fragility Curves; Masonry Infilled Frames; Reinforced concrete; Fiber-section; OpenSeesIncremental Dynamic AnalysisFiber-sectionIncremental Dynamic AnalysiFragility CurvesMasonry Infilled Frame
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