SEISMIC ANALYSIS OF MULTISTOREY BUILDING FRAME RESTING ON PLANE AND SLOPING GROUND
Shagun Puri 1 , Er. Mandeep Kaur22
Guru
Abstract - With the increase of populationandurbanization, the demand of space on the hilly areas is increasing day by day. the construction of slopes on hilly areas has to be considered to complete this demand. Seismic analysis is a static linear analysis which is used to predict the failure caused by the earthquakes before it happens.InthisthesisG+5 model has been analysed resting on different slopingangles0degree, 15-degree, 30 degree. This G+5 model is analysed by software ETABS 18.0.2. models are analysed on the plane and sloping areas. Firstly, seismic analysis is performed on the model assigning load cases and load combinations. After applying all the loads and all the lateral loads on the G+5 Model the model is set to run analysis. After running analysis, the results have to be compared such as storey drift, storey shear, overturning moment, maximum storey displacement. after analysing the results, the graph plotted according to the results came. All the loads are applied according to IS code 1893:2016 part 1. Storey shear is a graph that shows how much lateral (horizontal) load is acting per storey, whether from wind or seismic activity
Key Words: Seismic Analysis, G+5 Model, Lateral Load, Storey Shear, Storey Drift.
1. INTRODUCTION
Dueto thestructural irregularity,seismicforcesaremore severe in hilly terrain. In addition, earthquakes are more likelyinsteepterrain,accordingtoresearch.Thenorth-east Indian states, for example. The distribution of mass and stiffness in both the horizontal and vertical planes of a structuredetermineshowitbehavesduringanearthquake. Both of these qualities are affected by irregularity and asymmetry in hilly regions. Shears and torsion are more likelytooccurinsuchstructuresinseismicallyactiveplaces. Thearchitectureinthehillsdiffersfromthatontheplains.In horizontalandverticalplanes,theyareexceedinglyuneven andasymmetricalleadtodestructiveearthquakesprocessof dislocations segments is caused by the waves known as seismicwaves.Earthquakeisatypeofnaturaldisasterand itsconsequencesareoftendisastrous.Basically,earthquake can cause effects due to multistorey as well high-rise buildings running text should match with the list of referencesattheendofthepaper
Theidealisationofthestructure'sgeometryandtheloading onthestructuredeterminetheapproachandcorrectnessof analyticalconclusions.
Thepresentworkaimsatprovidingasimpleapproach
ForanalyzingtheG+5model restingonplaneandsloping ground and to compare the results of storey drift, storey shear,overturningmoment,maximumstoreydisplacement.
1.1 Objective
Tocomparethelateraldisplacementofmulti-storey building resting on plain and sloping ground at differentslopingangleswith respecttothemultistoreybuildingrestingonplainground.
To compare the behaviour of sloping ground structures at different sloping angles in different seismiczoneswiththesameloadingandstructural frames.
To study the effect of lateral forces on short columnsandlongcolumnsofmulti-storeybuilding restingonslopingandplainground.
1.2 Methodology:
ReviewexistingliteratureandIndiandesigncodeprovisions formulti-storybuildingdesign.onlyhorizontalearthquake ground motion is taken into account while designing and analysingbridges.
SelectAMultistoreyBuildingforCaseStudy.
ModellingandanalysetheG+5Multistorey
BuildingStructurerestingonplaneandslopingground.
Twoseismiczonesareconsideredbymodelasmention.
DesignisaccordingtoIS456:2000and
IS1893:2016part1.
Dynamicanalysisoftheselectedbuildingmodel
UsingResponse Spectrum Method, anda comparative studyontheresultsobtainedfromthe
Analyses.Afterthatcomparetheresultsofstoreyshear, storey displacement, overturning moment, maximum, storeydisplacementtogetanoptimum
Conclusion.
2. WORKDONE
ThedesignofanRCCmedium-risebuildingwithG+5stories and a floor height of 3 metres that will be subjected to earthquake loads in Zones IV and V has beenexplored. In thiscase,theETABS-2018.0.2softwarehasbeenconsidered asausefultool.Todeterminetheinfluenceonthebuilding, displacements, axial forces, shear force, bending moment, storey drift, and storeyshear , storey displacement, maximumoverturningmomenthavebeencalculatedforG+5 structurerestingonplaneandslopinggroundfordifferent anglessuchas0degree,15 degree,30degreethustofind outthevariouseffectonthebuilding.
ThemultistoreybuildingofG+5structurerestingonplane andslopinggroundconsideringseismiczone4andseismic zone5selectedforthepresentstudy.thestructuremodelis symmetric for 0-degree plane and unsymmetrical for the buildingwhichisrestingon15degreeand30-degreeplane
2.1 BUILDING DESCRIPTION
Thicknessofslab-150mm
Thicknessofwall-230mm
SeismicZone-4and5
SoilCondition-Medium
ImportanceFactor-1.2
ResponseReductionFactor-5
DampingStructure-0.05 LiveLoadonRoof–1.5KN/M
FloorFinish-0.5KN/M
2.2 Analytical Frame
The various effects on the model after analysis has been shownbelow
Case1:G+5buildingmodelwith0-degreeangle.
Case2:G+5buildingmodelwith15-degreeangle.
Case3:G+5buildingmodelwith30-degreeangle.
Asdiagrammaticexampleoffollowingcasesisshown:
ZONE 5
ZONE 4
From the above graph it is observed that maximum displacementisobservedinydirectionof15-degreemodel.
Accordingtotheobservationmadefromthegraphplottedit is clear that as the height of building increases maximum displacementgetsincreasedbutastheslopeoftheangleis increasingmaximumdisplacementgetsdecreased.So,thatis why maximum storey displacement is maximum in 15degreevalue.
ZONE 4
ZONE 5
4. SUMMARY
AG+5multi-storeybuildingwhichisconstructedindifferent angles0-degree,15degreeand30degreeinclinedonplane aswellasslopingground,seismiczones4and5WithI1.2, response reduction factor R 5, moment resisting frame building with medium stiff soil Type 2 Is Considered. The Main aim of this work is to Compare the Results After different analyses of the model resting on plane as well slopingground.
5. Conclusion
TheG+5StoreybuildingasperIS1893(Part-1):2016on thebasisofresultscamenowitcanbeconcludedthat:
Observed that, maximum storey displacement has higher value in 15-degree model because as the height increases displacement increases but as the sloping angle increases displacementdecreases.
G+5structurerestingon15degreeexperiencingmorevalue ofstoreydrift,storeyshear,overturningmomentduetothe reasonthatlengthofshortercolumnismoreascompareto longer column so it attracts more forces and resists more earthquakeloads.
Itisobservedthat the shorter columnhashighervalue of axialforcesandbendingmomentascomparetolongcolumn duetoreasonthatshortcolumnattractsmoreearthquake forcesascomparetolongercolumnsduetomorestiffnessin shortcolumnsoshortercolumnattractslargerearthquake forces.
7. REFERENCE
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