Search results for "concrete beam"

showing 10 items of 41 documents

Numerical prediction of the shear response of semi-prefabricated steel-concrete trussed beams

2016

Abstract In this study, the shear behavior of hybrid steel-trussed-concrete beams (HSTCBs) realized with prefabricated steel trusses embedded into a concrete core cast in situ, is investigated by means of Finite Element (FE) numerical simulations. HSTCBs do not behave as classical RC elements nor composite beams. Up to now, there are not specific design criteria in the building codes and the calculation of this type of beams is conducted by means of design-by-testing procedures. The knowledge of the material behavior as well as the understanding of the interaction between materials in contact is the first requirement for the definition of proper design procedures and calculation methods for…

EngineeringWork (thermodynamics)0211 other engineering and technologiesTruss020101 civil engineering02 engineering and technologyBendingConcrete damaged plasticity model0201 civil engineering021105 building & constructionGeneral Materials ScienceHybrid steel trussed-concrete beamShear behaviorVariable (mathematics)Civil and Structural EngineeringComputer simulationbusiness.industryCohesive steel-concrete interface; Concrete damaged plasticity model; Finite element model; Hybrid steel trussed-concrete beams; Shear behavior; Civil and Structural Engineering; Building and Construction; Materials Science (all)Structural engineeringBuilding and ConstructionFinite element methodShear (sheet metal)Settore ICAR/09 - Tecnica Delle CostruzioniHybrid steel trussed-concrete beamsCohesive steel-concrete interfaceMaterials Science (all)businessBeam (structure)Finite element model
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Simplified flexural response of steel-fiber reinforced concrete beams

2008

In the present paper, an analytical model is proposed that is able to determine the flexural response of supported beams under four-point bending tests. Cases of normal strength reinforced concrete beams with longitudinal bars in the presence of reinforcing hooked steel fibers and transverse stirrups are considered. A simplified analytical model is presented that is able to calculate the load-deflection curves and the maximum and ultimate deflections occurring in the case of shear or flexure failures. In the case of shear failure, the maximum shear strength of the beams is evaluated by using a recent analytical expression proposed by the author able to account for the shear-to-moment intera…

Engineeringbusiness.industryconcrete beamfiber reinforced materialfailuresBuilding and ConstructionStructural engineeringBendingFiber-reinforced concretebendingCompression (physics)Stiffeninglaw.inventionShear (sheet metal)Settore ICAR/09 - Tecnica Delle CostruzioniFlexural strengthMechanics of MaterialslawShear strengthGeneral Materials SciencesteelComposite materialbusinessBeam (structure)Civil and Structural Engineering
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Flexural behaviour of external R/C steel fibre reinforced beam-column joints

2011

ABSTRACT A softened strut-and-tie macro model able to reproduce the flexural behaviour of external beam-column joint is presented. The model is specific for concrete with hooked steel fibres (FRC) and it is designed to calculate the flexural response, as load-deflection curve, of a beam-column sub-assemblages. The model considers the presence of a constant vertical load acting on the column and of a monotonically increasing lateral force applied at the tip of the beam.

Environmental EngineeringMaterials scienceThree point flexural testbusiness.industryFlexural modulusSteel fibreVertical loadStructural engineeringbeam-column joint fibre reinforced concrete load-deflection curves analytical-model seismic resistance concrete beams strength connections stressSettore ICAR/09 - Tecnica Delle CostruzioniFlexural strengthBeam columnComposite materialbusinessJoint (geology)Beam (structure)Civil and Structural EngineeringEuropean Journal of Environmental and Civil Engineering
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Design of RC joints equipped with hybrid trussed beams and friction dampers

2021

Abstract The challenge of this research consists in the first attempt to apply a dissipative friction connection to beam-to-column joints with semi-prefabricated Hybrid Steel-Trussed Concrete Beams (HSTCB) and RC pillars cast in-situ. Nowadays, HSTCBs are widely adopted in civil and industrial buildings and, therefore, it is required to evaluate their compliance with the capacity design criteria and their seismic energy dissipation capability. However, the design of the reinforcement of such beams usually lead to the adoption of large amount of steel within the panel zone which becomes potentially vulnerable to the effects of seismic cyclic actions and dramatically reduce the dissipation ca…

Finite element modelsComputer scienceShear force0211 other engineering and technologies020101 civil engineering02 engineering and technologyRC jointsSeismic energy dissipation0201 civil engineeringDamper021105 building & constructionmedicineTorqueCivil and Structural Engineeringbusiness.industryFriction dampersStiffnessStructural engineeringDissipationFinite element methodSettore ICAR/09 - Tecnica Delle CostruzioniCyclic behaviour; Earthquake design; Finite element models; Friction dampers; Hybrid steel-trussed-concrete beams; RC joints; Seismic energy dissipation; Structural designHybrid steel-trussed-concrete beamsStructural designBending momentCyclic behaviourEarthquake designmedicine.symptombusinessBeam (structure)Engineering Structures
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Increasing the shear capacity of reinforced concrete beams using pretensioned stainless steel ribbons

2017

In this work, the second part of an experimental campaign investigating the efficiency of an alternative retrofitting method for increasing the flexural and/or shear capacity in reinforced concrete beams, based on the use of prestressed stainless steel ribbons and steel angles, is presented and analytically reproduced. This group of tests focuses on the ability of the adopted retrofitting method to improve the shear strength and ultimate deformation of reinforced concrete structural elements. As described in a companion paper, the adopted retrofitting method is alternative to traditional techniques of reinforced concrete retrofitting, being easy to install and usually reversible, and charac…

Materials science0211 other engineering and technologies020101 civil engineering02 engineering and technologyfib Model Code 20100201 civil engineeringCAM; fib Model Code 2010; reinforced concrete beams; retrofitting; shear; stainless steel ribbons; Civil and Structural Engineering; Building and Construction; Materials Science (all); Mechanics of MaterialsRetrofitting021105 building & constructionReinforced concrete beamRetrofittingGeneral Materials ScienceCivil and Structural EngineeringCAMbusiness.industryShearStructural engineeringBuilding and ConstructionReinforced concreteStainless steel ribbonShear (sheet metal)Settore ICAR/09 - Tecnica Delle CostruzioniMechanics of MaterialsMaterials Science (all)businessShear capacity
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Stress transfer and failure mechanisms in steel-concrete trussed beams: Experimental investigation on slab-thick and full-thick beams

2018

Abstract This study presents the results of an experimental investigation on semi-precast Hybrid Steel Trussed-Concrete Beams (HSTCBs) for analyzing the failure modes and the stress transfer mechanism between concrete and embedded steel elements (plate and truss). The available literature presents previous studies carried out by the authors mainly focused on the understanding of the local transfer mechanism by means of push-out tests. Conversely, in this paper original the results of laboratory tests conducted on six specimens of full-size HSTCBs subjected to four-point bending, with variation in the shear span, are reported on. From these results, the authors are able to assess the failure…

Materials science0211 other engineering and technologiesFour-point bending testTruss020101 civil engineering02 engineering and technology0201 civil engineeringAnalytical modeling; Experimental investigation; Four-point bending tests; Hybrid steel trussed-concrete beams; Stress transfer length; Civil and Structural Engineering; Building and Construction; Materials Science (all)Analytical modelingDeflection (engineering)021105 building & constructionTransfer mechanismGeneral Materials ScienceHybrid steel trussed-concrete beamStress transfer lengthStrain gaugeCivil and Structural EngineeringExperimental investigationbusiness.industryBuilding and ConstructionStructural engineeringSettore ICAR/09 - Tecnica Delle CostruzioniHybrid steel trussed-concrete beamsSlabMaterials Science (all)businessFour-point bending testsBeam (structure)Construction and Building Materials
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Computational Study of Failure of Hybrid Steel Trussed Concrete Beams

2017

This study investigates the failure behavior of hybrid steel trussed concrete beams (HSTCBs) under three-point bending through a series of finite-element (FE) simulations. The FE model employs well-established constitutive relations of concrete and steel with a simplified contact condition between the concrete and steel truss. The numerical model is compared with existing experimental data as well as a FE model that uses a more sophisticated concrete-steel interfacial model. The comparison shows that the present model is able to capture various failure mechanisms of the beam and its peak load capacity. The model is applied to investigate the behavior of a set of HSTCBs of different sizes, w…

Materials scienceConcrete beams0211 other engineering and technologies020101 civil engineering02 engineering and technologyBendingComposite beams0201 civil engineeringSize and geometrical effectsSize and geometrical effect021105 building & constructionGeneral Materials ScienceCivil and Structural EngineeringSeries (mathematics)business.industryMetal and composite structuresMechanical EngineeringComposite beam; Finite-element modeling; Fracture; Size and geometrical effects; Metal and composite structuresBuilding and ConstructionStructural engineeringFinite-element modelingFinite element methodFractureMechanics of MaterialsFracture (geology)Fe modelComposite beambusinessJournal of Structural Engineering
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Flexural and Shear Resistance of Steel Fiber–Reinforced Lightweight Concrete Beams

2014

In the present paper an analytical model is proposed that is able to determine the shear resistance of lightweight reinforced concrete beams with longitudinal bars, in the presence of reinforcing steel fibers. The model is based on the evaluation of the resistance contribution resulting from beam and arch actions. For the resistance contribution of main bars in tension, the residual bond adherence of steel bars and the crack spacing of reinforced concrete (RC) beams in the presence of fibers are considered. The contribution in terms of postcracking resistance in the tension zone of the beams is also included. The model was verified on the basis of experimental data available in the literatu…

Materials scienceConcrete beamsbusiness.industryMechanical EngineeringShear resistanceBuilding and ConstructionStructural engineeringResiduallightweigth concrete beams shearSettore ICAR/09 - Tecnica Delle CostruzioniFlexural strengthShear (geology)Mechanics of MaterialsUltimate tensile strengthGeneral Materials ScienceArchbusinessBeam (structure)Civil and Structural EngineeringJournal of Structural Engineering
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Analytical prediction of the shear connection capacity in composite steel–concrete trussed beams

2016

Steel–concrete trussed composite beams are a particular types of composite girders constituted by a steel truss embedded in a concrete core. The truss is typically composed by a steel plate or a precast concrete slab working as bottom chord while coupled rebars are generally used to form the upper chord. Moreover, a system of ribbed or smooth steel rebars welded to the plate and forming the diagonals of the truss, works as web reinforcement. In the present study, the attention is focused on the evaluation of the shear resistance of the connection between bottom steel plate (the bottom chord) and concrete core through the diagonal bars of the truss developing a mechanical model able to accou…

Materials scienceShear connection0211 other engineering and technologiesTruss020101 civil engineeringDowel02 engineering and technologySteel bar0201 civil engineeringDowels; Finite element model; Headed studs; Hybrid steel trussed-concrete beams; Push-out tests; Shear connection; Stress transfer mechanism; Theoretical model; Civil and Structural Engineering; Building and Construction; Materials Science (all); Mechanics of MaterialsGirderPrecast concrete021105 building & constructionGeneral Materials ScienceHybrid steel trussed-concrete beamTheoretical modelComposite materialCivil and Structural EngineeringHybrid steel trussed-concrete beams Shear connection Dowels Headed studs Push-out tests Stress transfer mechanism Theoretical model Finite element modelbusiness.industryBuilding and ConstructionStructural engineeringStrength of materialsPush-out testHeaded studSettore ICAR/09 - Tecnica Delle CostruzioniPush-out testsHybrid steel trussed-concrete beamsMechanics of MaterialsHeaded studsStress transfer mechanismPlastic hingeSlabMaterials Science (all)businessDowelsBeam (structure)Finite element modelMaterials and Structures
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Effectiveness of stirrups and steel fibres as shear reinforcement

2004

This paper presents the results of experimental tests carried out on rectangular simply supported beams made of hooked steel fibre reinforced concrete with and without stirrups, subjected to two-point symmetrically placed vertical loads. The tests, carried out with controlled displacements, allow one to record complete load-deflection curves by means of which it is possible to deduce information on dissipative capacity and ductile behaviour up to failure. Depending on the amount of transverse reinforcement, volume fraction of fibres added in the mix and shear span, the collapse mechanism is due to predominant shear or flexure, thus showing the influence of the aforementioned structural para…

Materials scienceTestbusiness.industryBuilding and ConstructionStructural engineeringSpan (engineering)Ultimate strengthIndustrial and Manufacturing EngineeringShear (sheet metal)Steel fibreFibre reinforced concrete beamSettore ICAR/09 - Tecnica Delle CostruzioniBrittlenessFlexural strengthVolume fractionDissipative systemShear strengthCeramics and CompositesGeneral Materials ScienceComposite materialbusinessStirrupBeam (structure)
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