Ring beam design, RIL Rewari - draft

30.000
4.000
8.000
8.000
16.700
116.739
0.350
0.782
1.850
0.550
2.000
0.650
0.800
2.000
2.650
5.000
3.000
4.275
3.725
0.050
816.400
4082.000
690.800
3454.000
63.765
73.575
68.670
206.010
188.606
943.030
520.522
2602.609
1022.672
5113.360
423.135
2115.677
i)SoilreportofRewarisitedonebyKunika
GeotechnicalServicesinSeptember2017
Internalangleoffrictionassumingfillingwithmurrumɸdegrees=
1.Designparameters
Shellradiusoftankm
ii)SurveymapsofRewarisite
Shelldiameteroftankm
MomentexertedbytotalstructuralsteelweightaboutouteredgeofringraftkN‐
m
WeightofbackfilledearthkNonouterprojectionofringraftkN
MomentexertedbyselfweightofringraftaboutouteredgeofraftkN‐m
TotalweightofcompactedsandactingoninnerprojectionofraftkN
TotalstructuralsteelweightofbottomplateskN
SoildensitykN/cum(KunikaGeotechnicalService'sreportdatedSeptember2017)
BearingcapacityofsoilkN/sq.m(KunikaGeotechnicalService'sreportdatedSeptember2017)
Coefficientoffrictionbetweencrushedrockandconcret
e
Minimumdepthoffoundationrequiredm
Assumeddepthoffoundationm(FGLtoBOCofraft)
Assumedthicknessofwallm
Assumedwidthofraftm
Assumedthicknessofraftm
Totalwallheight(stem+raftthickness)m
MomentexertedbyethanolrestingoninnerprojectionofraftaboutouteredgeofringraftkN‐m(intankfullcondition
)
3.Analysisofgravityloads,horizontalloads(exceptseismic,windload)
Designofringbeamfoundationfor8mØ,8mheighttanksforRelianceIndustriesLimited
ModernisationofexistingterminalatRewaritofacilitate20percentethanolblending
MomentexertedbycompactedsandweightaboutouteredgeofringraftkN‐
m
MomentexertedbybackfillaboutouteredgeofringraftkN‐m
Innerradiusofraftm
Outerradiusofringwallm
Innerradiusofringwallm
Totalstructuralsteelweightofshellplates,appurtenancesandstaircasekN
TotalstructuralsteelweightofroofplatesandsupportingstructurekN
TotalstructuralsteelweightactingonringwallfootingkN(excludingweightofbottomplatesinsideringwallfooting
)
Tankheightm
Thicknessofsandbitumenmixm
2.Initialproportioning
AssumedprojectionofwallaboveFGLm
Assumedheightofwall(TOCofwalltoTOCofraft)m
TotalweightofethanolactingoninnerprojectionofraftintankfullconditionkN
Referencedocuments
SelfweightofringwallraftkN
SelfweightofringwallkN
TotalstructuralsteelweightofemptytankkN
MomentexertedbyselfweightofringwallaboutouteredgeofringraftkN‐
m
Outerradiusofraftm

15.198
75.988
11.250
7.500
39.168
15.667
66.800
44.205
88.411
14.911
9.867
19.735
1.100
0.728
1.456
0.240
1.250
8350.000
1.000
6.200
0.008
210000000000.000
0.007
2.500
4.000
0.094
2624.417
5296.482
2672.065
496.545
250.506
4.480
3565.194
1798.634
492.953
734.769
1.000
0.580
2.953
0.565
2.000
0.042
770.886
3442.951
2672.065
SurchargepressureduetostructuralsteelweightkN/sq.matwallTO
C
Thicknessofshellplatestum
MassdensityofethanolN/cu.m
Heightabovebaseplatesatwhichthecenterofactionofslaboverturningmomentliesinimpulsivemodem(API6502020,clauseE.6.1.2.2‐2,
pageE‐18)
MomentexertedatraftBOCbyseismicforceinimpulsivemodeintankfullconditionkN‐m
MomentexertedatraftBOCbyseismicforceinimpulsivemodeintankemptyconditionkN‐m
TotaludlforceonthewallduetobitumensurchargeoutwardskN/m
MomentexertedbybitumenudlaboutraftTOCkN‐m
H/D(Histheshellheight,Disshelldiameter)
DesignhorizontalseismiccoefficientinimpulsivemodeAhi(IS1893part22014,clause4.5.2,page7)
DesignhorizontalseismiccoefficientinconvectivemodeAhc(IS1893part22014,clause4.5.2,page7
)
TotaludlforceonwallduetoethanolsurchargeoutwardskN/m
EffectiveconvectiveweightofethanolintankfullconditionkN(API6502020,E.6.1.1‐3,pageE17)
MomentexertedbythisactiveearthpressureaboutTOCofringraftkN‐m
WeightofbitumenonringwallkN
PassiveearthpressurekNexertedonwalltowardsinsidedirectionbybackfilledearthkNpermetercircumferentiallengt
h
MomentexertedatraftBOCbytotalroofweightkN‐m
TotaleffectiveimpulsiveweightoftankinemptyconditionkN
ConvectiveresponsereductionfactorRwc(API6502020,tableE.4,pageE‐15)
Sa/ginimpulsivemodefortimeperiod=0.007sec(IS1893part12016,clause6.4.2,page9)
Sa/ginconvectivemodefortimeperiod=2.952sec(IS1893part12016,clause6.4.2,page9)
ZonefactorforRewari(IS1893part12016,table3,page10).RewariisinZoneIV.
ImportancefactorI(IS1893part12016,table8/clause7.2.3,page19)
ImpulsiveresponsereductionfactorRwi(API6502020,tableE.4,pageE‐15)
5.Convectiveseismicanalysiswhentankisfullandempty(IS1893part1:2016,IS1893part2:2014,API650:2020)
EffectiveimpulsiveweightofethanolintankfullconditionkN(API6502020,E.6.1.1‐2,pageE‐16)
TotaleffectiveimpulsiveweightoftankinfullconditionkN
ImpulsivebaseshearintankfullconditionKn(API6502020,E.6.1‐2,pageE‐16)
ConvectiveperiodTcsec(API6502020,clauseE.4.5.2‐a,pageE‐13)
TotaleffectiveconvectiveweightoftankinfullconditionKn
ActiveearthpressurekNexertedonwalltowardsoutsidedirectionbycompactedsandkN
4.Impulsiveseismicanalysiswhentankisfullandempty(IS1893part1:2016,IS1893part2:2014,API650:2020)
MomentexertedbythispassiveearthpressureaboutTOCofringraftkNm
TotaludlforceonwallduetostructuralsteelsurchargeoutwardskN/m
MomentexertedbystructuralsteeludlaboutraftTOCkN‐m
SurchargepressureduetobitumenweightkN/sq.matwallTO
C
CoefficientCiforH/D=1.000(API6502020,figureE.1,pageE‐13)
ElasticmodulusofsteelEN/sq.m
ImpulsivenaturalperiodTisec(API6502020,clauseE.4.5.1‐1a,pageE‐12)
Surchargeethanolpressure(tankfull)atwallTOClevelkN/sq.m
MomentexertedbyethanolsurchargeudlaboutraftTOCkN‐m
D/H(Disshelldiameter,Hisshellheight)
SloshingfactorKs(API6502020,figureEC.6,pageEC‐7)
ImpulsivebaseshearintankemptyconditionKn(API6502020,E.6.1‐2,pageE‐16)
MomentexertedatraftBOCbytotalshellweightkN‐m
TotaleffectiveconvectiveweightoftankinemptyconditionK
n
MomentexertedbybitumencarpetaboutouteredgeofringraftkN‐
m

145.895
113.229
6.033
880.128
683.065
0.063
331.030
15.657
1655.151
78.283
0.028
97.263
75.486
486.317
377.429
6.868
4.545
9.089
622.000
463.593
285.512
286.209
47.000
1.060
1.000
1.000
1.150
57.293
1969.493
‐1.200
0.200
64.000
176.467
762.588
463.593
18310.675
39.497
762.588
24.011
286.209
13197.315
46.111
762.588
BasicwindspeedVbm/s(annexA/clause6.2,page51)
k1(table1/clause6.3.1,page7)
k2(table2/clause6.3.2.2,page8)
k3(clause6.3.3.1,page8)
k4(clause6.3.4,page9)
ConvectivebaseshearintankemptyconditionKn(API6502020,E.6.1‐3,pageE‐16)
OverturningmomentintankfullconditionaboutouterraftedgekN‐m(onlywind,noseismic
)
Factorofsafetyagainstoverturningwhenthetankisfullofethanol(onlywind,noseismic
)
OverturningmomentsintankemptyconditionaboutouterraftedgekN‐m(onlywind,noseismic
)
OverturningmomentsintankemptyconditionaboutouterraftedgekN‐m(onlyseismic,nowind
)
Factorofsafetyagainstoverturningintankemptycondition(onlyseismic,nowind
)
SumofrestoringmomentsintankfullconditionaboutouterraftedgekN‐m
7.Combinedseismicanalysis‐impulsive,convectiveandverticalwhentankisfullandempty
CombinedbaseshearactingintankfullconditionkN
SurchargepressureintankfullconditionduetoverticalseismicforcekN/sq.m
TotaludlforceonwallduetoverticalsurchargeoutwardskN/m
Momentexertedatwall‐raftinterfaceduetoverticalsurchargekN‐m
Factorofsafetyagainstoverturningwhenthetankisfullofethanol(onlyseismic,nowind
)
SumofrestoringmomentsintankemptyconditionaboutouterraftedgekN‐
m
OverturningmomentintankfullconditionaboutouterraftedgekN‐m(onlyseismic,nowind
)
CombinedoverturningslabmomentintankfullconditionkN‐m(API6502020,E.6.1.5‐2,pageE‐20)
MomentexertedatraftBOCbyseismicforceinconvectivemodeintankfullconditionkN‐m
CombinedbaseshearactingintankemptyconditionkN
8.Windanalysis(samefortankfullandtankemptyconditions,IS875part3:2015)
Heightabovebaseplatesatwhichthecenterofactionofslaboverturningmomentliesinconvectivemodem(API6502020,clauseE.6.1.2.2‐3,
pageE‐18)
MomentexertedbyverticalseismicforceinimpulsivemodeaboutouteredgeofraftkN‐mintankfullconditio
n
Verticalseismicforceinimpulsivemodeintankfullcondition,kN
ConvectivebaseshearintankfullconditionKn(API6502020,E.6.1‐3,pageE‐16)
Verticalseismicforceinimpulsivemodeintankemptycondition,kN
MomentexertedbywindloadaboutraftTOCkN‐m
9.Checkforoverturningofringwallintankfullandemptyconditions
WindloadactingonshellkN(clause7.3.1,page10)
DesignwindpressurePzN/sq.m(clause7.2,page9)
ExternalpressurecoefficientCpe(table5,page13)
6.Verticalseismicanalysiswhentankisfullandempty(IS1893part1:2016,IS1893part2:2014,API650:2020)
MomentexertedatraftBOCbyseismicforceinconvectivemodeintankemptyconditionkN‐m
Effectivefrontalareanormaltowindforcesq.m
CombinedoverturningslabmomentintankemptyconditionkN‐m(API6502020,E.6.1.5‐2,pageE‐20
)
MomentexertedbyverticalseismicforceinimpulsivemodeaboutouteredgeofraftkN‐mintankemptyconditio
n
Designverticalaccelerationcoefficientinimpulsivemode(IS1893part22014,clause4.10.1,page10)
DesignwindspeedVzm/s(clause6.3,page5)
Designverticalaccelerationcoefficientinconvectivemode(IS1893part22014,clause4.10.1,page10
)
Verticalseismicforceinconvectivemodeintankfullcondition,kN
Verticalseismicforceinconvectivemodeintankemptycondition,kN
MomentexertedbyverticalseismicforceinconvectivemodeaboutouteredgeofraftkN‐mintankfullconditio
n
MomentexertedbyverticalseismicforceinconvectivemodeaboutouteredgeofraftkN‐mintankemptyconditio
n
InternalpressurecoefficientCpi(clause7.3.2.1,page11)

17.306
3662.135
2639.463
622.000
1249.704
2.009
176.467
7.082
285.512
794.478
2.783
4.502
4.873
0.127
4.792
0.208
4.892
0.108
4.711
0.289
251.480
234.725
234.725
24.000
105.074
13.729
19.767
141.927
2.929
19.624
2.734
Lettheresultantforceduetototalgravityloadandtotalhorizontalforcelieatadistanceofxmetersfromtheouteredgeoftheraft
.
xwhentankisemptym(onlywind,noseismic)
Eccentricityoftheresultantforcefromraftouteredgewhentankisemptyem(onlywind,noseismic
)
Inference:Sincethefactorofsafetyisgreaterthan1.550foralltankfullandtankemptyconditions,theringwallissafeagainstslidin
g
11.Checkforsubsidenceofringwallintankfullandemptyconditions
Inference:Sincethefactorofsafetyisgreaterthan1.550foralltankfullandtankemptyconditions,theringwallissafeagainstoverturning
.
Inference:Outerdiameterofraft/3=10000/3=3334mm.Thevalueofxismorethan(outerdiameterofraft/3)forbothtankfullandtankemptyconditions.Theresultantforce
shallbewithinaradialdistanceof(outerradiusofraft)/3=5000/3=1666mmfromtankcenterpoint(middleone‐thirdradialdistance).Inotherwords,theeccentricityshallbemore
than5000‐1666=3334mmfromtheouteredgeofraft.Thisconditionissatisfiedforallloadcasesintankfullandemptysituations.Hencetheringwallfoundationissafeagainst
subsidence.
TotalweightoffoundationintankfullconditionpermetercircumferentiallengthkN(conservativeworstcaseestimate
)
MaximumpresureactingunderheelintankfullconditionkN/sq.m
Factorofsafetyagainstoverturningintankemptycondition(onlywind,noseismic
)
Factorofsafetyagainstslidingintankemptycondition(onlyseismic,nowind)
Factorofsafetyagainstslidingintankemptycondition(onlywind,noseismic)
xwhentankisemptym(onlyseismic,nowind)
Eccentricityoftheresultantforcefromraftouteredgewhentankisemptyem(onlyseismic,nowind
)
TotalslidingforceintankfullconditionkN(onlyseismic,nowind)
TotalslidingforceintankfullconditionkN(onlywind,noseismic)
14.Ringwallverticalreinforcementforworstcase(tankfull)
Factorofsafetyagainstslidingintankfullcondition(onlyseismic,nowind)
ImpulsivebaseshearintankfullconditionpermetercircumferentiallengthkN/m
Momentexertedbythisimpulsivebaseshearatwall‐raftinterfacekN‐m
Momentexertedbythisshellweightatwall‐raftinterfacekN‐m
TotalroofweightpermetercircumferentiallengthkN/m
TotalshellweightpermetercircumferentiallengthkN/m
FrictionresistanceofferedbyringfoundationintankfullconditionexcludingcompactedsandandethanolenclosedbyinneredgeoffootingkN
(API6502020,clauseE.7.6‐1,pageE‐28)
TotalslidingforceintankemptyconditionkN(onlyseismic,nowind)
Inference:Sincetheminimumpossiblepressureunderthetoeispositiveforallconditions,theringwallissafeagainsttensionorseparation
.
xwhentankisfullm(onlyseismic,nowind)
12.Requiredbearingcapacityofsubgradeaftergroundimprovementforworstcase‐tankfullandmaximumeccentricity
Eccentricityoftheresultantforcefromraftouteredgewhentankisfullem(onlywind,noseismic
)
xwhentankisfullm(onlywind,noseismic)
Eccentricityoftheresultantforcefromraftouteredgewhentankisfullem(onlyseismic,nowind
)
Totalweightoffoundationintankfullcondition,excludingcompactedsandandtankethanolinsideinneredgeoffootingkN(conservative
weightestimate)
Factorofsafetyagainstslidingintankfullcondition(onlywind,noseismic)
10.Checkforslidingofringwallintankfullandemptyconditions
Bearingcapacityrequiredaftergroundimprovement(kN/sq.m
)
Bearingcapacityrequiredaftergroundimprovement(ton/sq.m
)
13.Checkforminimumpressureunderheelforworstcase‐tankemptyandmaximumeccentricity
Totalweightintankemptyconditionactingon1metercircumferentiallengthofringraftkN(conservativeworstcaseestimate
)
MinimumpresureactingundertoeintankemptyconditionkN/sq.m
Frictionresistanceofferedbyringfoundationintankemptyconditionexcludingcompactedsandandethanolenclosedbyinneredgeoffooting
kN(API6502020,clauseE.7.6‐1,pageE‐28)
Totalweightoffoundationintankemptycondition,excludingcompactedsandandtankethanolinsideinneredgeoffootingkN(conservative
weightestimate)

29.250
5.808
35.037
17.571
87.853
5.163
25.813
18.839
14.050
85.002
7.500
88.411
19.735
1.456
9.089
211.192
316.789
30.000
500.000
477.000
1.392
0.341
25.000
205.000
130.000
63781.250
0.532
27.565
14.050
11.250
88.411
19.735
1.456
9.089
157.506
236.259
0.495
0.511
192.589
192.589
622.000
13.295
VerticalconvectiveseismicforceintankfullconditionpermetercircumferentiallengthkN/
m
MomentexertedbythisverticalconvectiveseismicforceaboutraftouteredgekN‐
m
Momentexertedbythiswindloadatwall‐raftinterfacekN‐m
WindloadactingpercircumferentiallengthofshellkN(clause7.3.1,page10)
Shearforceatwall‐raftinterfacebecauseofwindloadpermetercircumferentiallengthkN
Inference:SincenominalshearstressislessthandesignshearstressforM30concrete,theringwallsectionissafeinshear.
MomentexertedbybitumensurchargeudlaboutraftTOCkN‐m
Shearforceatwall‐raftinterfaceduetobitumensurchargeoutwardskN
Numberofverticalbarsperfaceofringwall
Momentexertedbycombinedseismicforce(convective,impulsive,vertical)atwall‐raftinterfacekN‐m
Totalmomentactingonthewall‐raftinterfacekN‐m
FactoredmomentMuactingonthewall‐raftinterfacekN‐m
Effectivedepthofwalld(centertocenterofverticalreinforcement)mm
Shearforceatwall‐raftinterfacebecauseofcombinedseismicforcepermetercircumferentiallength(impulsive,convectiveandvertical)Kn
Totalareaofverticalbarsprovidedperfaceofwallsq.mm
ConvectivebaseshearintankfullconditionpermetercircumferentiallengthkN/m
Momentexertedbythisconvectivebaseshearatwall‐raftinterfacekN‐m
Momentexertedbythisroofweightatwall‐raftinterfacekN‐m
VerticalimpulsiveseismicforceintankfullconditionpermetercircumferentiallengthkN/m
Maximumshearforceatwall‐raftinterfacekN
Shearforceatwall‐raftinterfaceduetoethanolsurchargeoutwardskN
Shearforceatwall‐raftinterfaceduetostructuralsteelsurchargeoutwardskN
GradeofconcreteMPa
YieldstrengthofsteelMPa
Inference:Areaofsteelprovided>Areaofsteelrequiredforwallverticalbars.ThevalueofMu/(b*d*d)islessthanthelimitingvalueof3.980MPaforM30concreteandFe500
steel.Thepercentageofreinforcementadoptedislessthanthelimitingvalueof1.132forM30concreteandFe500steel.Hencethesectionisunderreinforced.Thespacingofwall
verticalreinforcementislessthanthelesservalueof300mmand3d.
Percentageofsteelprovided
MomentexertedbyverticalseismicforcesurchargeudlaboutraftTOCkN‐m
MomentexertedbythisverticalimpulsiveseismicforceaboutraftouteredgekN‐m
Shearforceatwall‐raftinterfaceduetoverticalseismicforcesurchargeoutwardsKn
15.Ringwallcircumferentialreinforcementforhooptensionforworstcase(tankfull)
HooptensionudlpermeterheightbecauseofcompactedsandfillkN/m
TotalhooptensionbecauseofcompactedsandactingonringwallpermeterheightK
n
TotalcombinedseismicforceactingonringwallkN
OutwardlateralpressureinducedbythisseismicloadonringwallkN/sq.m
Forpercentageofprovidedreinforcement=0.532,designshearstressinM30concrete,MPa(IS456:2000,Table19,page73)
=
Mu/(b*d*d)Mpa,bisunitcircumferenceofwall=1000mm
Percentageofsteelrequired(SP16:1980,table4,page50)
Diameterofverticalbarsusedinringwallmm
Spacingofverticalbarsusedmm
Shearstressatwall‐raftinterfaceMpa
Momentexertedbyactiveearthpressureofcompactedsandatwall‐raftinterfacekN‐
m
Momentexertedbyethanolsurchargeudlatwall‐raftinterfacekN‐m
MomentexertedbystructuralsteelsurchargeudlaboutraftTOCkN‐m
Shearforceatwall‐raftinterfacebecauseofcompactedsand'searthpressureK
n
FactoredshearforceatjunctionkN