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IRC:83(PartII)-1987

SECTION:IX

BEARINGS

PARTII:ELASTROMERICBEARINGS.

THEINDIANROADSCONGRESS

1996
-(IItnjT)£?:3m am, at:>iT3AH*?i10aaoDHOI

XI:WOITD38

.8D/[I»Aaa3Ifl3MGflT8AJ3:11T5IA1

885bKMOD2CIAOHWAIOWI3HTdm

IRC:83(PartH)-19f7

STANDARDSPECIFICATIONS

AND

CODEOFPRACTICE

FOR

ROADBRIDGES

SECTIONiIX

BEARINGS

PARTniELASTOMERICBEARINGS

Publishedby

THEINDIANROADSCONGRfcSS

JamnagarHouse,ShahjahanRoad,

NewIk-IM-1HI(111

1996

PriceRs.200/-

(PfasPacking&Postage)

IRC:83(Partll)-1987

FirstPublished

Reprinted

Reprinted

Reprinted

Reprinted

Reprinted

Reprinted

Reprinted

June,1987

March,1991

January,1996

September,2000(withamendments)

June,2003

January,2007

September,2008

March,2011

PrintedatAbhinavPrints,Delhi-110041

(500copies)

IRC:83(PartIJ>iW7

CONTENTS

PageNo,

Introduction...I

912.Scope...2

913.Terminology...2

914.Notations...4

915.Materials...5

916.Design...8

917.Fabrication...11

918.AcceptanceSpecification...13

919.CertificationandMarking...19

920.Installation20

921.Maintenance...22

Appendix1:StandardPlanDimensionsand

DesignData...23

Appendix2:TestonCompleteBearings

orSections...24

Appendix3:QualityControlReport...29

DigitizedbytheInternetArchive

in2014 i

IRC:83(PartID-19S7

BEARINGS

PartII:ELASTOMERIGBEARINGS

INTRODUCTION

4thApril,1987.

L.S.Bassi...Convenor

A.l).Narain...Member-Secretary

SecretarytotheGovt,ofIndia(K.K.Sarin) - Ex-offido

April,and22ndMay,1987respectively.

withExpansionJoints. beenpublishedasIRC:83-1982. designedanderected.

MEMBERS

n.K.BasM

J.N.Chaudda

S.P.Chakraboni

V.P.Deshpande'

A.K.Gupta

P.S.Gokhale

AchyutGhosh

D.T.Grover

BrijcndraSingh

Dr.P.RayChoudluiry

Dr.T.N.SubbaRao

Secretary,IRC(NinanKoshi)-Ex-officio

1

IRC:8*(PartH>-1987

912.SCOPE

thefollowing: vulcanisedasasinglehomogenousblock. anchoringdevices. thosefilledinsubsequently. sionofthisCodeshallnotapply. theengineer: (1)Freebearingcircular (ii)Freebearing - rectangularorcircularwithdowelholes(foralignment (iv)Fixedbearing,anchoredwithdowels.

913.TERMINOLOGY

913.1.Crystallisation

whicharereversible.

913.2.ChloropreneRobber(CK)

themonomerchloroprene.

913.3.Elastomer

2

IRC:83(PartII)-1987

deformation.

913.4.ElastomericBearing

ofthesuperstructurebyelasticdeformation.

913.5.Engineer

913.6.Inspector

913.7.Laminate

expansionoftheelastomer.

913.8.LaminatedBeariqg

(CIIR) world.

913.10.NaturalRubber(NR)(Polyisoprene)

particularlyHaveaBrasiliensis.

913.11.RanElastomer

3

IRC:85(PartIl)-1987

913.12.ShoreHardness

B,etc.).

914.NOTATIONS

tothatoflaminate laminate,Fig.8 c^sidecover,Fig.8 a•-denotesdesignvalue concreteinsuperstructure

EomApparentelasticmodulusofbearing

tingforcreep,shrinkage,etc.

GmShearmodulus

hoOuterdimension hmn.hi+lh9,totalelastomerthickness h* - thicknessofindividualinternallayerofelastomer,Fig.8 ht - thicknessoftop/bottomouterlayerofelastomer,Fig8 hi - thicknessofsteellaminate,Fig.8 {Appendix2) laminate.Fig.8 /"mmi+2c,overalllengthofbearing bearings n"totalnumberofinternalelastomerlayers elastomerlayers 4

IRC:83(PartU)-1987

Nmat - maximumpermissibleN,designcapacity

Nn.tn*minimumpermissibleNtdesigncapacity

cover) om• - totalangleofrotationduetoimposedloadsandsupport rotationofthesuperstructuredesign,value. ">d,a»d - angleofrotationacrossthewidthbandthelength/(ifany) ofthebearing "i,m"» - maximumpermissibleangleofrotationofasingleinternal (acrossb) "<<.max - maximumpermissibleangteofrotationofasingleinternal (across1) p - ow»/10sratioofactinga,ntopermissiblevalue ture,designvalue• any)ofthebearing

A*"sVerticaldeformation

Y* - shearstrainofelastomerbearing,designvalue

any)ofthebearing a>*wmN/A - Averagecompressivestress

TfH»H/A-Averageshearstress

~t"Shearstressduetoaxialcompression

TfmShearstressduetohorizontaldeformation

*i - Shearstressduetorotation

Note:SIunitsshallbeused.

915.MATERIALS

915.1.RawMftterlal

bearing.

DenkaS-40V)shallbeused.

rubbershallbeused. 5

IRC:"3(PartUyim

ROTATIONOFANINTERNALELASTOMERLAYER

Fig.8.Elastomer*bearing:Generalfeatures

6

IRC:83(PartII>-!9S7

ptXXII(year1984).

915.2.Properties

PropertyUnitTestmethod,I.S.

Specificationreference

(1)(2)(3)

Valueofthe

characteristic specified (4)

1.Physicalproperties

1.1.tfardnesairhd

1.2.Minimumtensile

StrengthMPa

1.3.Minimumelonga-

tionatbreak%

2.Maximum

compressionset% C.R.

3.Acceleratedageing

C.R.

3.1.Maximumchange

inhardnessIRHD

IS:3400(PartII)

IS:3400(Part1)

IS:3400(PartI)

IS:3400(PartX)

durationtemperature (h)CQ (+0100±1 to24-2)

IS:3400(PartIV)

durationtemperature (h)("C)

70100±1

*0±5 17 400
35
+13

3.2.Maximumchange

intensilestrength

33.Maximumchange

inelongation -13 -30 7

IRC:83(PartII)-1987

belessthan0.80MPanorgreaterthan1.20MPa. lessthan7kN/m. satisfied: maybedeemednecessary. purposeofthisCode.

916.DESIGN

valuesasspecifiedinIRC:6. (1)NownalloadtNd (2)HorizontalloadHi (3)ImposedtranslationAj (4)Rotationad S

IRC:83(PartID-1987

seismic,windandotherloadcombinations). !6.2.PlanDimensions

916.3.

6mmandsidecovershallbe6mmforallbearings.

IndexNo.)

(vii)Thicknessofsteellaminatesshallbe3mmforh> - 8and10mm and4mmforhi=12mm.

916.3.DesignRules

(i)8mm (ii)10mm (iii)12mm (iv)16mm(forspecialuse) bearings. 9

IRC:83(PartUyml

criteria: (2)Mlbo<2 (3)hbd\0 (4)/?,(mm)8101216 (5)//.(mm)'3346 (6)Mmm)4566 (7)c"6mm (8)S>6<12

4mmforht<10mm;and6mmforhi>12mm.

916.3.4.Transition

7d<0.7

where7a=7bd=Am/^'+(wherexlndisinMPa) orincaseof7uco-existing

7d={7U1+7^Y

i%

916.3.5.Rotation

following:

04^(JH.aft,,max

"0.5amhiwberead=ouIRC:83(Part11)1987 ou"=400M,H"*L!(El)10-3 y,i<0.2+0.110MPa>*m>2MPa

916.3.7.Totalshearstress

-r+T+T<5MP* "(X where~ c - 15a""/S.MP* ted. r whereamco-cxists

Ta=jj^j-(b-'Ahi-|-/*a/,)

917.FABRICATION

IRC:83(Part1I)-1987

used.Alledgesofplatesshallberounded. sequently. bodyofthebearing. specifiedinTable2.

Table2.Tolerances

ITEMSTOLERANCES

i.Overallplandimensions(/",bo) - 0,+6mm

2.Totalbearingthickness(he-)-0.+.5%^

3.Parallelism

(a)Oftopsurfaceofbearingwithrespecttothe bottomsurfaceasdatum !in200 (b)Ofonesidesurfacewithrespecttotheother asdatum

1in100

4.(a)Thicknessofindividualinternallayer

ofelastomer[k*)±20%(max*of2ram) (b)Tbtckocssofindividualouterlayer(ho} - 0,+Imm

5.(a)Plandimensionsoflaminates(ltb) - 3mm,4-0

(b)Thicknessoflaminate±10% (c)Parallelismoflaminatewithrespectto bearingbaseasdatum

1in100

allowanceofvulcaniz&te. 12 lRC:83(Part!f)-l987 place. qualityoftheproducts.

918.ACCEPTANCESPECIFICATION

demand. manufacturerandengineer. engineerandafterobtaininghisapproval. satisfaction. made. 13

IRC:83{PartID-198"

918.2.AcceptanceLot

gotapprovedbytheengineer. larg•lot.

918.3.LevelsofAcceptanceInspection

thefollowingtwolevelsdependingonlotsize:

Level1acceptancetesting

Level2acceptancetesting

eventuallyconsumedindestructivetesting. destructivetestingoffinishedbearings. 14

IRC:83{PartI!)-1987

bornebythemanufacturer.

918.4.Testing

Acceptancetestingshallcomprise

Generalinspection

Testonspeciallymouldedtestpieces

qualitycharacteristicsdetailedbelow:

918.4.1.Acceptancetestingleveli

918.4.1.1.Generalinspection

rniblesuperficialdefects. specifiedinTable2. loadtocorrespondtoa," - 15MPaappliedinstepsandheldcon- defectslike

Misalignmentofreinforcingplates

Poorbondatlamioate/steelinterface

Variationinhiorh"

Anysurfacedefects

Lowstiffness

(ofthemeanvalue). engineer. 15

IRC:83(PartU)-1987

ofacceptance.

Hardness(TableI1.1j

TensileStrength(Table1-1.2)

ElongationatBreak(Table1-1.3)

CompressionSet(Table1-2)

AcceleratedAgeing(Tablei-3)

AdhesionStrength(Clause915.2.2.)

deemedmaximumacceptable.

Specificgravity

,;:0.2

Ashcontent+0.5"..

Hardness(Table11.1)

Tensilestrength(Table112)

Elongationatbreak(Table11.3)

Compressionset(Table1-2)

Acceleratedageing(Tablei3)

Adhesionstrength(Clause915.2.2.)

toryforacceptanceofbearingsofCR. tedageingcouldbeconsideredasadequate. 16

IRC:8.MPartII)-1987

accepted.

Testfordeterminationofshearmodulus.

Testfordeterminationofadhesionstrength

tothosegiveninAppendix2.

918.4.2.Acceptancetestinglevel2

accepted.quotesdbs_dbs18.pdfusesText_24

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