Comparative Analysis Of Different Irregular Building With Regular Building

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

Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

Comparative Analysis Of Different Irregular Building With Regular Building

[1] M.tech student, Institute of engineering and technology, Lucknow

[2] Asst. Professor, dept. of civil engineering, Institute of engineering and technology, Lucknow ***

Abstract – This study comprises state-of-art knowledge in the seismic response of vertically irregular building frame, During severe seismic shaking irregular building may suffer disproportionate damage or collapse that can be minimized by increasing robustness The prime objective of this study is to find out the how irregular buildingsshowstherebehaviorwhentheseismicloadsor effects with real time seismic data apply on the structure. Analysis is going to be done with finite element analysis using time history data in the E-TAB 2016 software, and inseismiczoneIV.

Key Words: Verticle irregularity, time history analysis.

1. INTRODUCTION

Presence of asymmertricity in the reinforced concrete increases seismic vulnerability; In areas in the word that experience a high frequency of the earthquake, considering irregularity is an integral part of the process of earthquake engineering or structural designing irregularitiesariseduringanearthquake.Weaknessinthe structure can be caused by discontinuities in the mass, stiffness, or geometry. Vertical irregularity of a structure becomes the primary cause of failure during an earthquake. Zones with vertical irregularity are carefully evaluated and developed with the appropriate treatment whensuchstructuresarebuiltinhighseismiczones,such as zone IV or zone V. Soil structure interaction's seismic consequencesmustbetakenintoaccount.Threemodels Model 1 (regular), Model 2 (story-1, without slab), and Model 3 (story-1, slab with double thickness) were taken intoconsiderationforanalysisinthecurrentstudy.

The comparative analysis of regular and irregular structure will be based on the base shear, story stiffness, Storydisplacement&driftanalysis

Earthquake is the greatest anticipated lateral force that resultsfromgroundaccelerationanddependsonthekind of soil. Story Stiffness, or the total stiffness of all permanentmembersparticipatinginacertainstory.

Here we are going to compare and analyze the different type of buildings with there stiffness, base shear, story

displacement and drift index values. In modeling we used the E-TAB 2016 for structural seismic analysis, we also used the Finite Element Method with the Time History input data When it comes to irregular structure design Timehistorymethodgivesthebestresultsforlateralforce distribution with actual ground acceleration data that has beenexperiencedinthepast

2. OBJECTIVE

Mainobjectiveofthepaperistoknowthebehaviorofthe structureunderdifferentparameters

To know the behavior of the structure with differentgeometricconditions

To know the story stiffness of the structure for bothregularandirregular

To know the base shear conditions in the both thecases

To find out the Story Displacement difference betweensymmetric&asymmetricbuilding

To show the differences in Drift index for both cases

3. METHDOLOGY

The present work is carried out to understand the behavior of structure, when we use the irregular buildinginsteadofregularbuilding.Therearestepby step procedures involved in the modeling and analysisofthestructure

Irregularities in buildings

Irregularities can be defined in two major parts, they are: 1- Planirregularity 2- Verticalirregularity

[1] Piyush Mishra [2] Er. Prince Yadav

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

Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

In plan irregular buildings, five types irregularity present,theyare:

● Torsion Irregularity

● Re-entrantCorners.

● DiaphragmDiscontinuity.

● Out-of-Plane Offsets

● Non-parallel Systems

In vertical irregular buildings also five types rregularitypresenttheyare:

●Stiffness. Irregularity

●Soft Storey

●ExtremeSoftStorey.

●Mass Irregularity.

●Vertical GeometricIrregularity

Modelling

FormodellingandanlysingE-TAB2016softwarehasbeen used , here I have been created three model having 9story building with model Type-1 Regular bulding, Model type-2 Irregular building have no slab at story 1, Model Type-3 irregular building with double depth of slab on story1

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

Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

Structural Properties :-

Plandimension 16X15m2

No.ofstories 9

Floortofloorheight 3000mm

Beamsize 250X500mm

Columnsize 450X450mm

Thicknessofslab 150mm

Zone IV

Zonefactor 0.24(IS1893:2016)

Importancefactor 1(IS1893:2016)

Responsereductionfactor 5(IS1893:2016)

Gradeofconcrete M30

Gradeofsteel Fe415 Densityofconcrete 25kN/m3

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

Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

Some of loading properties at building is describe below

There are various type of loading properties used in the structureareasfollows

Deadloadofslab 3.75kN/m2

Floorfinishload 1.0kN/m2

Rooffinishload 1.0kN/m2

Liveload 3.0kN/m2 (IS1893:2016)

There is one more fundamental to be added for valuable contribution i.e. Time History Data to be used for seismic valuation

Time history data is always taken from the past experience of the seismic wave and that help in analyzing thereal timevaluationofstructuredesigning

TIME HISTORY DATA

Depth(Km) 46.0 Magnitude 7.8 Region Iran-Pakistan-Border-Region

Alldetailstakenfrom IMD

StationCode DCE

StationLat. 28.795N

StationLong. 77.118E

StationHeight(m) 208.0

SiteClass CVs30between200m/secto375m/sec

RecordTime 16.04.201310:49:13.829

SamplingRate 200Hz

RecordDuration 169.970Sec. Direction E-W(E-positive)

Max.Acceleration 1.521cm/sec2

4. RESULT & OBSERVATIONS

4.1 STIFFNESS VALUE FOR REGULAR & IREGULAR BULDINGS

Asperobservationofgraphresultsshowsthatstiffnessin theirregularbuildingwith doubledepthofslabatstory1 is 16.74% is more than regular building (model 1) & 23.92% more than the irregular building with no slab on story1(model2)

4.2 BASE SHEAR VALUE FOR HARD SOIL

Asperobservationofgraphresultsshowsthatbaseshear intheirregularbuildingwithdoubledepthofslabatstory 1 is 3.80% is more than regular building (model 1) & 14.23% more than the irregular building with no slab on story1(model2)

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

Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

4.4 DRIFT INDEX VALUE FOR ROCK/HARD SOIL

As per observation of graph results shows that base drift index in the irregular building with double depth of slab atstory1is12.66%islessthanregularbuilding(model1) & 9.12% less than the irregular building with no slab on story1(model2)

4.3 STORY DISPLACEMENT VALUE FOR HARD SOIL

As per observation of graph results shows that story displacement in the irregular building with double depth of slab at story 1 is 7.76% is more than regular building (model1)&36.41% morethantheirregularbuildingwith noslabonstory1(model2)

5. CONCLUSIONS

Asweallknowthatbaseshearonsuperstructure is all depend on the soil condition (stiffness of soil) as per observation maximum value of base shear gives in model -3 and model-2 shows lowest valuesthanthemodel-1&Model-3

Maximum value of base shear will be found at peak height of the structure , also base shear decreasesasthestiffnessofthesoildecreases

Asweknowstory stiffnessisthesumofstiffness of all permanent member present, as per observationmaximumvalueofbasesheargivesin model -3 and model-2 shows lowest values than themodel-1&Model-3

Maximum value of stiffness is observed at the baseofthestructure

As we know displacement of structure is observe with reference to base , as per observation maximum value of base shear gives in model -3 andmodel-2showslowestvaluesthanthemodel1&Model-3



International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 08 | Aug 2022 www.irjet.net p-ISSN: 2395-0072

As per observations drift index in the irregular building with double depth of slab shows lowest value for drift index and regular building shows lesser value than the irregular with no slab on story 1, here model 2 shows lowest value among allofthem

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