Structural Performance of Regular Stone Prism Encased Composite Column

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072

Structural Performance of Regular Stone Prism Encased Composite Column

1Shine Elsa Mathew, M.Tech Student, Dept. of Civil Engineering, Sree Buddha College of Engineering, Kerala, India 2Midhila V.S, Assistant Professor, Dept. of Civil Engineering Sree Buddha College of Engineering, Kerala, India ***

Abstract - The core component of the concrete filled steel tube (CFST) is replaced with a stone prism in this new type of CFST. This stone prism can be made either from newly mined and manufactured stone or from stone buildings that have been destroyed. Due to the high compressive strength of the stone and the efficient confinement offered by the steel tube, these columns should be able to support more weight than typical CFST columns. The high strength of the stone offers additional confinement from the inside of the concrete, therefore it is envisaged that the infilled stone prism will improve the local bearing behaviour of CFST. Using ANSYS software, thestructuralperformanceofthecompositecolumns encased in stone prisms under axial compression was investigated.

Key Words: Axial Compression, CFST, Composite, Confinement, Infilled, Stone prism, Ansys

1. INTRODUCTION

A vertical structural component intended to convey a compressive load is known as a column. The foundation receives the load from the beam and slab supporting the ceilingorroof,includingitsweight,throughacolumn.Asa result,itshouldbeclearthatifonecolumnfails,theentire structure will crumble. Stub columns are referred to as columnsthatarenotimmediatelyattachedtothefooting.To transfertheloadfrom the primary beam,it isbuilt over a beamoraslab.Stubcolumnshavearelativelysmallheight. Figure1displaysastubcolumn.Additionally,itisofferedif theroomislonger.Toincreasetherigidityofbuildings,stub columnsarealsoavailable.Itaidsinthetransmissionofload fromonebeamtoanother.Stubcolumnsareutilisedinthis project. In order to take advantage of each material's advantageousqualities,compositecolumnsareconstructed usingavarietyofstructuralsteelandconcretemixtures.The composite column is a rigid, economical, and hence structurally effective part in the construction of buildings and bridges due to the behaviour of concrete and steel elements.OnekindofpopularcompositecolumnistheCFST column. Concrete Filled Double Skin Tubes (CFDST), Reinforced Concrete Filled Double Skin Tubes, Composite Column System, Concrete Encased CFST column, and StiffenedCFSTcolumnaresomeofthedifferentvarietiesof CFST columns. Compared to regular steel or reinforced concrete, a concrete filled steel tube (CFST) column structurehasvariousbenefits

Fig.1StubColumn

It was proposed that confining stone inside steel tubes wouldincreaseitsductility.Therefore,anewtypeofCFST memberissuggestedhere,knownasStonePrismEncased CompositeColumns,whichswapsoutthecoresectionofthe infilledconcretewithastoneprism.AStonePrismEncased CompositeColumnisexaminedinthisthesis.Additionally,a composite column encased in a stone prism of a different shape is also studied. ANSYS 21 is a finite element programmeusedformodellingandanalysis.

1.1 Stone Prism Encased Composite Column

Hereasteeltubefilledwithstoneprismandconcreteis analyzedshowninFig.2.Thesteeltubeisofcircularshape anddifferentshapeofstoneprismsuchascircular,square, triangular,hexagon,rectangularandoctagonareusedhere. Materialusedforthestoneprismisgranite.Thisstoneprism can be either newly mined and fabricated or used from demolished stone structures. While considering the high compressive strength of stone blocks and the effective confinementofferedbythesteeltube,betterload carrying capacity could be expected in the stone prism encased concrete filled steel tubular members than conventional CFSTmembers.

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

Table 1: Dimensionaldetailsofcircularsteeltube

Totallengthofsteeltube 600mm

Outerdiameterofsteeltube 219mm

Wallthicknessofsteeltube 8mm

Table 2: Dimensionaldetailsofstoneprisms

Fig.2StonePrismEncasedCompositeColumn

Theinfilledstoneprismisexpectedtoimprovethelocal bearing behavior of CFST, since the high strength stone providesextraconfinementfromtheinsideoftheconcrete. The proposed system can also decrease negative environmentalimpactsbyreducingconcreteproductionand providingareusemechanismfordemolishedstoneblocks.

1.2 Objective

To investigatethe effect of circularsteel tube filled with concrete and different shapes of stone prism like circular, square,triangular,pentagonal,hexagonal,rectangularand octagonalunderaxialloading.

2. ANALYSIS OF CIRCULAR STEEL TUBE FILLED WITH CONCRETE AND DIFFERENT SHAPES OF STONE PRISM

Itdealswiththedimensionaldetails,modellingdetailsand analysisandresultsofcircularsteeltubesfilledwithconcrete and different shapes of stone prism like circular, square, triangular,pentagonal,hexagonal,octagonalandrectangular inANSYSsoftware.

2.1 Geometric Modelling

In order to determine the effective shape for the stone prism, six shapes of stone prism were selected for the analysis. The seven different shapes chosen for the comparisonarecircular,square,triangle,pentagon,hexagon, octagonandrectangular.Theendsupportingconditionwas providedasbottomendfixedandtheloadwasappliedonthe other end. The dimensional details of circular steel tubes filled with concrete and different shaped stone prism are giveninTable1andTable2.

Circular Diameter=84.7mm Height=600mm Square Width=75mm Height=600mm Triangular Width=114mm Height=600mm

Pentagon Width=57.2mm Height=600mm Hexagon Width=46.5mm Height=600mm Octagon Width=34.15mm Height=600mm Rectangle Width=113mm Height=600mm

2.3 Modelling

Modellingofcircularsteeltubesfilledwithconcreteand square shaped stone prism is done by using element type SOLID186.Coefficientoffriction0.3isgiven betweensteel tube and concrete to avoid the slip. Modelling of circular steel tube filled with concrete and square shaped stone prismisshowninFig.3.

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

(e) (f)

(g)

Fig 2.1: Solidmodelofcircularsteeltubefilledwith concreteanddifferentshapesofstoneprism(a)Circular stoneprism(b)Squarestoneprism(c)Triangularstone prism(d)Pentagonalstoneprism(e)Hexagonalstone prism(f)Octagonalstoneprism(g)Rectangularstone prism

2.4 Meshing and Loading

HeretheelementtypeusedisSOLID186.Elementshapeis ofhexahedron.Elementsizeprovidedforsteeltubeis10mm andasizeof30mmforconcreteandstoneprism.Loadingis done based on displacement convergence criteria with a valueof8mmandthecorrespondingultimatevalueisnoted.

2.5 Analysis

Non linear static analysis is carried out in circular steel tubefilledwithconcreteanddifferentshapesofstoneprism to find the maximum ultimate load corresponding to the deformation. The deformation of circular steel tube filled withconcreteanddifferentshapesofstoneprismareshown inFig.4.

(c) (d) (e) (f)

(g)

Fig 2.2: Deformationofcircularsteeltubefilledwith concreteanddifferentshapesofstoneprism(a)Circular stoneprism(b)Squarestoneprism(c)Triangularstone prism(d)Pentagonalstoneprism(e)Hexagonalstone prism(f)Octagonalstoneprism(g)Rectangularstone prism

2.6 Results and Discussions

Theload deflectiongraphofDeformationofcircular steeltubefilledwithconcreteanddifferentshapesofstone prismisshowninFig.5

Table 3:Comparisonofresults

(a) (b)

ShapesofStoneprism Deflection(mm) Load(kN) Square 3.2061 5464.2 Circular 3.2314 5561.6 Triangular 3.2082 5470.7 Pentagon 3.2063 5481.6 Hexagonal 3.2057 5517.1 Octagonal 3.2049 5507.9 Rectangular 3.2158 5429.7

International Research Journal of Engineering and Technology (IRJET) e ISSN: 2395 0056

Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p ISSN: 2395 0072

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Chart

-1:Comparisonofloaddeflectiongraph

Herecircularshapedstone prismhasbetterultimateload carryingcapacitythantheothers.Thepercentageincreasein loadcarryingcapacityofcircularshapedstoneprismcarries 1.782%moreloadthanothers.

3. CONCLUSIONS

Thisstudyexaminesthestructuralbehaviourofacomposite columnencasedinaStoneprism.Analysisofstoneprismsis done to determine the best shape. The findings are as follows:



Stone prisms with a round shape have a higher maximumloadcarryingcapabilitythantheothers. The stone prism with a round shape has a 1.782 percent greater load carrying capability than the competition.

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

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

Thecircularcolumnisstrong incompressionwhen comparedtothesquarecolumninthesamecross sectionalarea.

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