COMPARISON OF ANALYSIS AND DESIGN OF REGULAR AND IRREGULAR CONFIGURATION OF MULTI-STORY BUILDINGS IN

COMPARISON OF ANALYSIS AND DESIGN OF REGULAR AND IRREGULAR CONFIGURATION OF MULTI-STORY BUILDINGS IN VARIOUS SEISMIC ZONES AND VARIOUS TYPES OF SOIL

1PG Student, Department of Civil Engineering KJCOEMR, Pune, Maharashtra, India

2HOD, Department of Civil Engineering KJCOEMR, Pune, Maharashtra, India

3Professor, Department of Civil Engineering KJCOEMR, Pune, Maharashtra, India ***

Abstract – Today's world faces some of the major problems caused by nature. One of the biggest natural disasters is earthquakes. Multi story RC construction, subject to the most dangerous earthquakes. It has been found that the main reason for the decay of RC buildings is the incorrect distribution of mass, stiffness, and strength and due to incorrect geometric configurations and different types of soil. Due to improper construction of the plan, the settlement is also diverse compared to the construction with the correct shape.

However, previous records of earthquakes show poorseismiccharacteristicsofthestructure.Thisisdueto ignoranceoftheaspectofirregularityintheformulationof methodologiesforseismicdesignthroughseismiccodes(IS 1893: 2002). These analyzes are performed by examining multi storyG+11buildingswithdifferentseismiczones3 and4andforeachzone,thebehaviorisassessedbytaking twodifferentsoiltypes,namelysolidandmediumdifferent reactionssuchasplotdeviation,displacementandbaseline shear are applied to different zones and different types of soils from the seismic regulations proposed in IS 1893 2002, using the equivalent static method and software STAADProV8i.

Key Words: Regular and irregular configuration, static analysis

1.INTRODUCTION

Much of India is vulnerable to damaging levels of seismic hazards.Soitisnecessarytotakeintoaccounttheseismic load when designing the structure. In buildings, lateral loads due to earthquakes are a problem. These lateral forces can cause critical stresses in the structure, cause unwanted vibrations or cause excessive lateral rocking of the structure. The swing or drift is the amount of lateral displacement in the upper part of the building relative to itsbase.

The limit state may correspond to the intensity of the earthquake, equal to the strongest experienced or predicted at the site. In the present study, the results wereexaminedforequivalentstaticload.

NowthedailypopulationofIndiaisincreasingdaybyday, therefore the demand for buildings, houses and apartments in row houses is also increasing. Due to the larger population, tall buildings are being built. While the construction of tall buildings, some factors are influenced bythebuildingsuchassoillayersorsoiltype,earthquake zone,windload,etc.Sideforcesforcethebuildingtomove or shake, which is why earthquake analysis is much more importantinhigh risebuildings.

The forces of the earthquake are arbitrary and unpredictable, and static and dynamic analysis of the structure has become a major concern of civil engineers. The main part of a multi story building is the column, the beamandthefoundation.Inourproject,weanalyzeG+11 buildings in different earthquake zones with different types of soils (medium, hard) with different irregularities in the plan such as rectangular, c shaped, and l shaped buildings. SBC for medium soil is 245 KN.M ^ 2, and for hardsoilisfrom300KN/M^2to440KN/M^2.

BUILDING DETAILS:-

Numberofstories:11

Columnsize300mmX750mm

Heightofatypicalfloor:3m

Beamsize:300mmX450mm

Platethickness:125mm

thickness:230mm,150mm,100mm

Liveload:2Kn/m2

Floorcovering:1Kn/m2

Steelgrade(Fe):500N/mm2&415N/mm2

Densityofconcrete:25N/mm2

allcolumnsarefixedatthebase.

Densityofbrickmasonry:20KN/m2

Ratioofpoisonsinconcrete:0.3

Ratioofbricksofbrickwork:0.2

Modulusofelasticityofconcrete:2500N/mm2.

BUILDING FORM:

Rectangular building: Inabuildingwitharegularshape, thenumberofbaysintheXandYdirectionsis9.

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C shaped building: The socket number in the X directionis13andthesocketnumberinthezdirectionis 6.

L-shaped building: - The socket number in the X direction is 14 and the socket number in the Y direction is6.

2. METHODOLOGY

Seismic weight of the building: Theseismicweightof the construction tools is calculated on the total floor weightofthe building.Basic natural periodaccording to IS1893(part1):2002.

Theapproximatebasicnaturalperiodofvibration: Ta=0.075h^0.75forabuildingwithanRCframe Ta=0.085h^0.75forabuildingwithasteelframe Billy,h=heightofthebuilding. LOAD COMBINATIONS:

LOAD CASE DETAILS:

Earthquake load: TherearetwotypesofearthquakesintheX andZdirectionsdirection(i.e.EQXandEQZ). Fig4&5 EARTHQUAKELOADINXANDZDIRECTION

Dead Load: Self weight:Automaticallydefinedbysoftware. Wall Load:

ExternalWall:20x1x0.23x3=13.8kN/m

InternalWall:20x1x0.15x3=9kN/m

ParapetWall:20x1x0.1x1=2kN/m Fig6&7.DEAD&WALLLOADINXANDZDIRECTION

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1.2(DL+LL±EQZ)

1.5(DL±EQX)

1.5(DL±EQZ)

0.9DL±1.5EQX

0.9DL±1.5EQZ

875(Part2):

figno11.

Output for analysis and design in STAAD pro: Afterentering all values and some values are automatically taken from on software such as own weight, SBC on soil, etc. After this, ontheresultisgivenbelow. Fig12

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Figno13

3: RESULTS AND DISCUSSIONS

Hardsoil

Shape/Direct ion/Zone

Rect. shape C shape L shape

X dir. Z dir. X dir. Z dir. X dir. Z dir.

Zone 3 24.23 43.78 25.93 47.05 25.17 55.90

Zone 4 36.29 65.63 38.82 70.43 37.70 83.81

Table1 COMPARISONOFLATERALDISPLACEMENTINX AND ZDIRECTIONINHARDSOIL.

Shape /Direc tion

Medium soil Rect. shape C shape L shape

X dir. Z dir. X dir. Z dir. X dir. Z dir.

Zone 3 32.91 59.52 35.21 63.88 34.19 76.00

Zone 4 49.32 89.24 52.74 95.69 51.24 113.9

Table2 Comparisonoflateraldisplacement(mm)inXandZ directionforMediumsoil chart 12

1. The above diagram and table show the X and Z offset for MeanandHardsoil.

2. I can observe that displacement in Z direction is bigger than on displacement in direction X for medium and hard soil.

3. For solid soil type, the displacement is 30.14% minimum comparedtotheaveragetypeofsoil.

4. Given the solid soil, the more stable or minimal displacement of the shape of the building is a rectangle and maximum displacement in an L shaped building. Andalsothesameformediumsoil.

5.Alsoweobservethatondisplacementinzone3is16.95% minimumanddisplacementinthearea4eMore▼inthe XandZdirections.

Base shear: Thefollowingtableshowsthevalueofbaseshear in hard, medium soil and zone 3, zone 4. The values of base shear in the X and Z direction are the same as per software output.

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STEEL PERCENTAGE:

Zone/So il/ shape

HARD SOIL Rec. Shape C Shape L Shape Zone3 2480.09 1918.34 1491.69 Zone4 3720.13 2877.50 2237.53

Therequirementofsteelforallbuildingsisgiveninthebelow table

Zone/Soil /Shape Hardsoil Rec.Shape C Shape L Shape Zone3 14.19 7.42 14.08 Zone4 14.21 14.12 14.11

Table9.Comparisonofsteelpercentage(%)forHardsoil

Chart13ComparisonofBaseshearinXandZ direction forhardsoil

Zone/Soil /Shape Medium soil Rec.Shape C Shape L Shape Zone3 3372.92 2608.94 2028.69 Zone4 5059.38 3913.41 3043.04

Chart7.Comparisonofsteelpercentage(%)forHardsoil

Comparison of steel percentage (%) for Medium soil

Zone/Soil /Shape Mediumsoil Rec.Shape C Shape L Shape

Zone3 14.21 14.12 14.09 Zone4 14.81 14.73 14.63

Table9.Comparisonofsteelpercentage(%)formediumsoil

chart14.ComparisonofBaseshear inXandZ direction formedium soil

Discussionsaidsuchasfollows:

1. We observe that in everything from building with and everything zones, on b share is maximum in zone 4 in a rectangle form buildings.Andatleastinarea3inanL shaped building.

2. In everything from building on base share is 49,01% maximum in zone 4 in average soil suchascomparedwithzone3inhardsoil.

3.Сconsideringhardandaveragesoilonminimum value on base shearing is in zone 3,in L. form building

Chart8.Comparisonofsteelpercentage(%)forMediumsoil

Discussionasfollow:

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1. InallShapebuildings(i.e.Rect.,CandLshape)the steel percentage is more in zone 4,in medium soil, andminimuminzone3inhardsoil.

2. Theminimumsteel(7.42%)isrequiredforCshape building which is in zone 3 inhard soils and it is alsoeconomical.

3. The maximum steel (14.81%) is required for Rect. shapebuildingwhichisinzone4,inmediumsoil.

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3. CONCLUSION

1.Instructureisanalyzedinzone3andzone4.I findonthe resultinBaseshearingvalueisMore▼ inzone4thcenturyaveragesoil(incorrect configuration).

2.Basis shearing value is More ▼ in zone 4 and that in onaveragesoil (regularconfiguration).

3.Basisseismicshear4ishigherthan73.53%compared totheZone3.

4Comparedto bothregular andincorrectconfiguration basic shear value is more in the ordinary configuration asthestructureismoresymmetricaldimensions.

5.Reachingthedisplacementsofthefloorinzone4there arehigherdisplacements thanintheZone3.

6.MinimumMovingismeetinginrectangularformat_on thebuilding.

7.Maximum history drift is meeting in theintermediate history of rectangle formbuilding while the minimum driftstoryoccursinL shapeonthebuilding.

8. When comparing the two on regular and irregular configurationis history driftvalueisMore▼inregular configuration because on structure there are more dimensions.

9.Steelamountofseismiczone4ishigherthanZone3.

10. When comparing the two on regular and irregular configuration is the steel quantity isMore in regular configuration.

11.Fromonaboveresultszone4iscriticalforon G+11structure.

12. seismic zones zone 4 thereisa higher zone factor than zone 3. Yes zone 4 values on Baseshear, 13. 13. RelocationsandtheamountofsteelareMore thanzone 3.

14. Basis shearing, displacement, and steel quantity are According On The area factor so these values are more inZone4.

15. Given rectangle C and L shaped building. 16. An L shaped building is More effective in Zone 3 and hardtypesoil. AnL shapedbuildingismoreefficientforBase share,Floor Driftinseismiczone3

REFERENCES

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