Search results for "columns"

showing 10 items of 40 documents

Simplified Model for Compressive Behavior of Concrete Columns Strengthened by Steel Angles and Strips

2010

This paper presents an analytical model to determine the compressive response of concrete members, having a square transverse cross section and reinforced with steel angles at the corners and steel strips connecting the steel angles. The model evaluates the effects of transverse strips and steel angles on confinement pressures, including strength and buckling phenomena. Compressive response was evaluated in cases of directly and indirectly loaded elements. The data produced correlate well with available experimental data.

Materials sciencePhysics::Instrumentation and Detectorsbusiness.industryMechanical EngineeringSTRIPSStructural engineeringPhysics::Classical PhysicsConcrete columns Strengthening Steel angles Strips Ribbons Confinement Strength BucklingSquare (algebra)law.inventionTransverse cross sectionSettore ICAR/09 - Tecnica Delle CostruzioniTransverse planeanglesCompressive strengthBucklingMechanics of MaterialslawstripComposite materialbusinessJournal of Engineering Mechanics
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Numerical Modeling Approaches of FRCMs/SRG Confined Masonry Columns

2019

The Fabric Reinforced Cementitious Matrices (FRCMs) and Steel Reinforced Grout (SRG) are a promising strengthening solution for existing masonry since inorganic matrix is considerably compatible with historical substrates. The present paper is focused on a Finite Element (FE) analysis of masonry columns confined with FRCM composites developed by Abaqus-code. The masonry columns were modelled using a macro model approach. The model was performed by using the following functions Concrete Damage Plasticity (CDP) and the Plastic (P) in order to describe the constitutive laws of material for masonry columns and external reinforcement, respectively. Typical failures of FRCM-systems are slippage o…

Materials sciencemasonry columnsGeography Planning and Development0211 other engineering and technologiesfabric/matrix bond020101 civil engineering02 engineering and technologyengineering.material0201 civil engineeringFRCM systemslcsh:HT165.5-169.9Matrix (mathematics)Overlap zone021110 strategic defence & security studiesbusiness.industryGroutBuilding and ConstructionStructural engineeringMasonrylcsh:City planningFinite element methodUrban Studiesnumerical modelinglcsh:TA1-2040confinementengineeringCementitiousSlippagebusinesslcsh:Engineering (General). Civil engineering (General)Failure mode and effects analysisFrontiers in Built Environment
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Economie assessments on the use of wired and wireless recharging systems in Italian and European market

2017

The conductive charging method for the electric vehicles is the most widespread, since it is the simplest and has higher returns. In the last years, alternative charging technologies have been investigated. Between these wireless charging systems have been large diffusion and have been commercialized by some manufacturer. Wireless charging systems for electric vehicles have some advantages respect the wired ones, not obliging the user to connect physically the vehicle to the electric charging station. Assuming the efficiency declared by the manufacturer of wireless systems the authors, in this paper, estimate the maximum cost that wireless recharging systems can have to be, however, more fa…

Net Present ValueComputer scienceBiomedical EngineeringEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciInductive chargingNet present valueMaintenance engineeringCharging stationReduction (complexity)Order (exchange)Economic indexewireless recharging systems0202 electrical engineering electronic engineering information engineeringWireless0501 psychology and cognitive sciencesRenewable Energy050107 human factorsSustainability and the Environmentbusiness.industryRenewable Energy Sustainability and the Environment05 social sciencesrecharging columns020206 networking & telecommunicationsrecharging columnefficiencywireless recharging systemeconomic indexesValue (economics)economic indexes; efficiency; Net Present Value; recharging columns; wireless recharging systems; Energy Engineering and Power Technology; Biomedical Engineering; Renewable Energy Sustainability and the EnvironmentTelecommunicationsbusiness
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Economic analysis on the use of wired and wireless recharging systems

2017

Wireless charging systems for electric vehicles have some advantages respect the wired ones, not obliging the user to connect physically the vehicle to the electric charging station. However, at the same time, they have disadvantages linked to issues of electromagnetic compatibility and low efficiency. This study considers some scenarios for which both wired and wireless recharging systems can be adopted, with the aim of estimate the efficiency that must be guaranteed by wireless systems, so that its realization could be more favorable with respect to wired one. The estimation is developed by means of classical economic indexes, in the framework of Italian end European markets. Results repo…

Net Present ValueEngineeringEnvironmental Engineering020209 energyEnergy Engineering and Power TechnologyEfficiency02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciRecharging columnsRecharging columnNet present valueWireless recharging systemIndustrial and Manufacturing EngineeringCharging stationEconomic indexesWireless recharging systemsEconomic indexe0202 electrical engineering electronic engineering information engineeringWirelessEconomic analysisWireless systemsElectrical and Electronic Engineeringbusiness.industryElectromagnetic compatibilityEconomic indexes; Efficiency; Net Present Value; Recharging columns; Wireless recharging systems; Energy Engineering and Power Technology; Electrical and Electronic Engineering; Industrial and Manufacturing Engineering; Environmental EngineeringbusinessTelecommunicationsRealization (systems)2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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Half-width plots, a simple tool to predict peak shape, reveal column kinetics and characterise chromatographic columns in liquid chromatography: Stat…

2013

Peak profiles in chromatography are characterised by their height, position, width and asymmetry; the two latter depend on the values of the left and right peak half-widths. Simple correlations have been found between the peak half-widths and the retention times. The representation of such correlations has been called half-width plots. For isocratic elution, the plots are parabolic, although often, the parabolas can be approximated to straight-lines. The plots can be obtained with the half-widths/retention time data for a set of solutes experiencing the same kinetics, eluted with a mobile phase at fixed or varying composition. When the analysed solutes experience different resistance to mas…

Peak profiles in chromatography are characterised by their height position width and asymmetry; the two latter depend on the values of the left and right peak half-widths. Simple correlations have been found between the peak half-widths and the retention times. The representation of such correlations has been called half-width plots. For isocratic elution the plots are parabolic although often the parabolas can be approximated to straight-lines. The plots can be obtained with the half-widths/retention time data for a set of solutes experiencing the same kinetics eluted with a mobile phase at fixed or varying composition. When the analysed solutes experience different resistance to mass transfer the plots will be solute dependent and should be obtained with the data for each solute eluted with mobile phases at varying composition. The half-width plots approach is a simple tool that facilitates the prediction of peak shape (width and asymmetry) with optimisation purposes reveal the interaction kinetics of solutes in different columns and characterise chromatographic columns. This work shows half-width plots for different situations in isocratic elution including the use of different flows the effect of temperature the modification of the stationary phase surface by an additive the existence of specific interactions within the column and the comparison of columns. The adaptation to gradient elution is also described. Previous knowledge on half-width plots is structured and analysed to which new results are added.Work (thermodynamics)Column characterisationmedia_common.quotation_subjectKineticsLiquid chromatographyAnalytical chemistryHalf-widthsInteraction kineticsBiochemistryAsymmetryAnalytical ChemistryPeak shapeColumn (typography)Position (vector)Mass transferPhase (matter)media_commonChromatographyElutionChemistryOrganic ChemistryGeneral MedicineModels TheoreticalKineticsPredictionChromatography LiquidJournal of Chromatography A
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The Use of Chromatographic Methods Coupled to Mass Spectrometry for the Study of Emerging Pollutants in the Environment.

2018

The consumption of compounds that improve the human health and wellness is increasing, and as a result, the residues of these substances reach the environment or food chain. For this reason, the scientific community is looking for new analytical methods that are more accurate and can detect the greatest number of compounds in different matrices. This manuscript compares different studies in abiotic and biotic matrices, where most of them (92%) uses Liquid Chromatography to separate the compounds. For the detection, most of the studies for both matrices uses, coupled to the chromatograph, a triple quadrupole mass spectrometer (50%) due to the precision to quantify the concentration of these …

PollutantChromatographyChromatographyMass spectrometry010401 analytical chemistry010501 environmental sciencesMass spectrometry01 natural sciencesMass Spectrometry0104 chemical sciencesAnalytical ChemistryTriple quadrupole mass spectrometerTime of flightHuman healthColumnsEmerging pollutantsEnvironmental scienceHumansEnvironmental Pollutants0105 earth and related environmental sciencesChromatography LiquidEnvironmental MonitoringCritical reviews in analytical chemistry
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A Theoretical Model to Evaluate the Compressive Behaviour of RС Jacketed Columns

2016

Reinforced concrete (RC) jacketing is becoming increasingly common among the different retrofit techniques for poor RC members, due to its economical and practical advantages. Experimental investigations in the literature have shown that the actual axial capacity of RC jacketed members can be substantially lower than that analytically evaluated by adapting the most common theoretical models for confined concrete. This fact can be explained by taking into account the presence of tensile stresses developing in the concrete, due to a mutual interaction between the inner core and the external jacket. This phenomenon is relevant especially in members where the concrete properties of the jacket a…

Settore ICAR/09 - Tecnica Delle CostruzioniCircular Columns Confinement RC Jacketing Retrofit Softening
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COMPRESSIVE BEHAVIOR OF LAMINATED GLASS COLUMNS

2014

This paper examines the behavior in compression of glass columns having tee (T) transverse cross-sections. The work highlights the issues recurring in the design of glass columns in rapid diffusion in the transparent architecture such as: - flexural and torsional buckling; - long-term effects and effects related to the temperature; - glued connections between single panels. In the work expressions are given for the calculation of the loadcarrying capacity of columns. The cases of full connection and absence of connection between the panels are analyzed and discussed. The comparison between the analytical and the experimental results highlights that in the case of glass columns with T cross-…

Settore ICAR/09 - Tecnica Delle CostruzioniLaminated glass Glass columns Compression Buckling
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Compressive behaviour of laminated glass columns with T cross-sections

2014

Settore ICAR/09 - Tecnica Delle CostruzioniLaminated glass Glass columns Compression Buckling
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Performance Assessment of Basalt FRCM for the Confinement of Clay Brick Masonry Cylinders

2021

Fibre Reinforced Cementitious Matrix (FRCM) composites have been proved to be a suitable strengthening material for masonry structures in the last years. Moreover, basalt fibres are increasingly used as reinforcement of composites as a more sustainable alternative to glass fibres. The goal of this work is to investigate the effectiveness of basalt FRCM to confine masonry circular columns. A total of eighteen clay brick masonry cylinders were tested in compression. The specimens were cored from two different masonry assemblies and wrapped with one or two layers of BFRCM composite. The stress-strain curves and the gains of strength and strain capacity of confined cylinders compared to the con…

Settore ICAR/09 - Tecnica Delle CostruzioniMasonry columns FRCM Basalt-fibre strengthening Confinement Experimental investigation12th International Conference on Structural Analysis of Historical Constructions
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