Search results for "modelling."
showing 10 items of 1269 documents
Simplified equivalent finite element modelling of concrete-filled steel tubular K-joints with and without studs
2022
Concrete Filled Steel Tubular (CFST) K-joints employed for truss structures gained high interest in the last years due to their widespread use in engineering practice. The overall performances of these joints can be efficiently improved by using steel studs welded in the inner surface of the steel chord filled with the concrete, avoiding punching shear failure, and improving the overall strength and ductility. However, a reliable prediction of the structural behavior of the joints is outmost of importance for the assessment of the capacity of new and existing structures, and there are no standardized design methods nowadays. In this paper, the structural performances of CFST K-joints with a…
Out of Plane response of Unreinforced Masonry infills: Comparative analysis of experimental tests for the definition of strategies of macro modelling…
2022
During an earthquake, an interaction between the in-plane and out-of-plane seismic forces occurs and the infilled frames suffer damage in both in-plane and out-of-plane directions simultaneously. Particularly, the out-of-plane collapse of unreinforced masonry infill walls is critical even for new buildings complying with the modern seismic codes, resulting in high casualties and huge economic losses. However, the out-of-plane behaviour of infill walls is yet not fully understood. This study is therefore aimed towards characterizing the out-of-plane seismic capacity of unreinforced masonry infill walls. First of all, available out-of-plane experimental tests performed on unreinforced masonry…
Modelling steel jacketed RC columns: Remarks by experimental-numerical comparisons
2015
The recent large use of nonlinear seismic assessment techniques requires the definition of highly reliable computational models. The retrofitting or strengthening of RC columns by steel angles and battens is a commonly adopted technique, used to improve strength and deformation capacity of existing RC buildings. In the case of steel angles not directly loaded, the numerical definition of the cross-section model has to be handled carefully since it is affected by more uncertainties. The vertical load carried by the angles is a function of the lateral confinement pressure, the cohesion and the friction coefficient between the materials, parameters which are not always easy to predict. The pap…
A numerical study on the effect of the interface material model on the tensile behaviour of FRCM strips
2019
Fibre Reinforced Cementitious Matrix (FRCM) composites are becoming increasingly popular for strengthening masonry structures for which the compatibility of the inorganic matrix with the chemical and physical properties of the support makes it advantageous to adopt such systems. However, despite the large use of FRCMs for strengthening applications, the characterization and modelling of the mechanical response in tension of these systems is an open issue. In fact, the constitutive tensile law of the composite shows to be affected by different variables, such as the clamping system adopted during tensile test, the gauge length used for recording strains, the monitoring of the number of yarns…
Architectural library. Dioscuri Temple in Agrigento
2013
This paper presents the synthesis of research about the ICT solution for cultural heritage through the innovative technology of representation and survey. One objective was to identify a method of processing data for knowledge, dissemination and preservation of the asset. Historical analysis, surveying, photogrammetry and laser scanner, the processing of survey data and modelling are all focused to the same final purpose. The methodology developed for this application framework becomes adoptable in General for Cultural Property, which become in turn the protagonists of 3D WebGIS.
The Urban Landscape in the Graphic Representation of the Cathedral of Palermo
2018
This study proposes some reflections on the relationship between the Cathedral of Palermo and the urban portion where it is placed, in relation to the indissoluble connection with the landscape that in the history offered a variety of perceptive suggestions marked by the passage and the coexistence of different cultural and social domination. To this end, the multiscale historical-urban planning analysis puts in place the role that territorial and urban morphology has had over time in relation to the Cathedral of Palermo. In this sense, the relationship between the architectural artefacts, such as the Royal Palace and the Town Hall, and the urban context is studied according to its access r…
The new boundaries of digitization: from bim to parametric modelling
2022
The theme of digitization and documentation, which inevitably affects the fields of surveying and designing architecture and urban areas, is constantly innovated by the new digital technologies and new multimedia communication systems that allow us to acquire, analyze and disseminate the value of our historical heritage. Research in this field pushes us to overcome the limits imposed by tested technologies in order to extend the field of application in the surveying and representation of the increasingly complex challenges imposed by the needs of conservation and maintenance. This volume, which follows on from the three previous conferences of the “Digital & Documentation” cycle that to…
Gustavo Pulitzer Finali. Interpretazioni grafiche di una Villa sul mare, 1930.
2017
Questo studio riguarda la lettura grafica di un progetto mai realizzato di Gustavo Pulitzer Finali, una ‘Villa sul mare’, presentato alla Triennale di Monza nel 1930. Il ridisegno del progetto, necessario per la comprensione del pensiero architettonico, mostra come l’architetto triestino sia riuscito a sintetizzare l’architettura navale e quella di terra in un unico organismo plastico. Il modello digitale, strumento di indagine di spazi, ad oggi, non esplorati, fornisce alla letteratura scientifica immagini inedite del progetto di Pulitzer Finali. This study concerns the graphic reading of an unbuilt project by Gustavo Pulitzer Finali, a ‘Villa by the sea’, presented at the Triennial in Mon…
Computational modelling of brittle failure in polycrystalline materials using cohesive-frictional grain-boundary elements
2014
A 3D grain-level formulation for the study of brittle failure in polycrystalline microstructures is presented. The microstructure is represented as a Voronoi tessellation and the boundary element method is used to model each crystal of the aggregate. The continuity of the aggregate is enforced through suitable conditions at the intergranular interfaces. The grain-boundary model takes into account the onset and evolution of damage by means of an irreversible linear cohesive law, able to address mixed-mode failure conditions. Upon interface failure, a non-linear frictional contact analysis is introduced for addressing the contact between micro-crack surfaces. An incremental-iterative algorith…
Dynamic Preisach hystersis model for magnetostrictive materials for energy application
2013
Recently Magnetostrictive materials have been proposed as active materials to be used in several energy harvesting technology [1]. In this kind of application, the working condition of the material is highly dynamic and non linear. As a result static models of magnetostrictive materials are usually not very accurate and can be not reliable to develop a sufficiently accurate designof the energy harvesting devices. The presence of hysteresis requires accurate mathematical modeling in order to correctly foresee the behavior of real materials (ferromagnetic or magnetostrictive) used in control systems or in electrical machines and thus simplifying the design of such controllers or predicting wi…