បេតុងពង្រឹងដោយដែក 13 xiii-footings
TRANSCRIPT
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T.Chhay NPIC
Footing 275
epSgKaBIeRkamnIv:UdI. r)aykarN_BIkarBiesaFn_dIkMNt;nUvlTPaBRTRTg;GnuBaatedIm,IeRbIkgkarKNna.enAtMbn;RtCak;EdlmanFak;RBil frost actionGacnwgekIneLIg bfycuH. dUcenHeKcaM)ac;RtUvdak;eCIg
tagBIeRkam freezing depth edIm,IeCosvagkarmanclna.
2> RbePTeCIgtag Types of Footings
eKmaneCIgtagCaeRcInRbePTEdleRbIsMrab;RTssr bCBaaMg. eCIgtagEdleKeRbICaTUeTAmandUcxageRkam
- Wall footingsRtUv)aneRbIedIm,IRT structural wallEdlRTbnkBIkMralxNbedIm,IRTnonstructural walls
. vamanTTwgkMNt;nigmanRbEvgCab;KaenABIeRkamCBaaMg rUbTI13>1.Wall
footings Gac mankMras;EtmYy Gacmanfak;bGacmanCMral.
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Department of Civil Engineering viTasanCatiBhubeckeTskm2. vaGacmanragkaerctuekaNEkg brgVg;. mgeTot eCIgtammankMras;esI manfak;bmanCMral. vaCaRbePTeCIgtagEdl
manlkNsnSMsMcbMput negvaRtUv)aneRbIenAeBlssrmanKMlatqay. RbePTEdleKcUlciteRbICageKKWmanragkaer bctuekaNEkgCamYykMras;esI.
- Combined footing rUbTI13>3CaTUeTARTssrBIr bssrbIEdlminenACYrEtmYy. ragrbs;eCIgtagkgbg;GacCactuekaNEkg bctuekaNBay GaRsynwgbnkssr. Combined footingsRtUv)aneRbIenAeBlssrBIrenACitKaEdleCIgtag single footings minGaceRbI)an benAeBlssrmYysitenAelIbenAEk,rproperty line.
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T.Chhay NPIC
Footing 277
- Cantilever or strap footings rUbTI13>4 rYmmaneCIgtag single footings BIrPab;edayFwmmYy bstrap mYy nigRTssreTalBIr. vaRtUv)aneRbIenAeBlEdleCIgtagmYyRTssrcakpit ehIy
eCIgtagmYysitenAEk,rmancMgayKMlattUc. RbePTeCIgtagenHCMnYs combined footings nigeBlxHmanlkNsnSMsMcCag.
- Continuous footings rUbTI13>5 RTnUvssrmYyCYrEdlmancMnYncab;BIbIeLIg. vamanTTwgkMNt;nigCab;KaBIeRkamssrTaMgGs;.
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T.Chhay NPIC
Footing 279
eCIgtagsitenABIelIdIsit (cohesive soil) dUcCadI\d sMBaFenABIxageRkamcugeCIgtagFMCagenARtg;GkSrbs;eCIgtag rUbTI13>10. dI\dEk,rcugRKwHmanPaBsitxaMgCamYynwgdI\denAEk,rEdlBTCMu
vijeCIgtag begIt)anCakarBRgaysMBaFmines
I.CaTUeTAsMBaFdIRTRTg;GnuBaat aq RtUv)ankMNt;ecjBIkarBiesaFn_dI. sMBaFdIRTRTg;GnuBaat
enHERbRbYleTAtamRbePTdI BItMlx8 enAeBlEdlbnk P manGMeBIEpkneCIgtagBIeRkamssrrkklnwgRsutcuHeRkam. eCIgtagnwgyknUvTMrg;ExSRtg;esIEdlbegItCasMBaFbukeLIgelIvijedIm,ITb;Epkn
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Department of Civil Engineering viTasanCatiBhubeckeTskm karBicarNakgkarKNna Design Consideration
eCIgtagRtUv)anKNnaedImI,RTbnkssr nigbBanbnkssreTAdIy:agsuvtiPaB. viFIsaRskgkarKNnaRtUvEtykersIusg;caM)ac;xageRkammkBicarNa
- RkLapeCIgtagQrelIlTPaBRTRTg;dIGnuBaat- kMlaMgkat;mYyTis one-way shear
-
kMlaMgkat;BIrTistwo-way shear
bkMlaMgpugpunching shear
- m:Um:g;Bt;nigbrimaNEdkRtUvkar- lTPaBRTRTg;rbs;ssrenA)atrbs;va nigEdk dowel caM)ac;- RbEvgf1>
TMhMeCIgtag Size of FootingRkLapeCIgtagGacRtUv)anKNnaBIbnkxageRkABitR)akd m:Um:g; nigbnkKanemKuNEdl
minFMCaglTPaBRTRTg;rbs;dI. CaTUeTA sMrab;bnkQr
RkLapeCIgtagaqpressure,soilallowable
weight)-self(includingloadservicetotal= !#>!
baq
totalPArea
)(=
Edl bnkeFVIkarsrubCabnkKNnaK
anemKuN. enAeBlEdlRkLapRtUv)ankMNt; sMBaFdIemKuNRtUv)anTTYledayEckbnkemKuN LDPu 6.12.1 += edaykLapeCIgtag. kareFVIEbbenHedIm,IKNnaeCIgtagtamviFIKNnaersIusg;(strength design method) .
footingofarea
uu
Pq = !#>@
sMBaFdIGnuBaat aq RtUv)anTTYlBIkarBiesaFn_dI nigQrelIlkxNbnkeFVIkar (serviceload) .
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T.Chhay NPIC
Footing 281
4>2> kMlaMgkat;mYyTis kMlaMgkat;Fwm 1uV One-Way Shear (BeamShear)
sMrab;eCIgtagCamYynwgkMlaMgBt;mYyTis muxkat;eRKaHfak;sitenAcMgayd
BIpmuxrbs;ssr.kMlaMgTajGgt;RTUgenAmuxkat; mm kgrUbTI13>11 GacRtUv)anBinitemIldUcGVIEdl)aneFVIsMrab;Fwm. kMlaMgkat;TTwgGnuBaatenAkgkrNIenHesInwg
bdfV cc '12
2 = 75.0= !#>#
Edl =b TTwgrbs;muxkat; mm . kMlaMgkat;TTwgemKuNenAmuxkat; mm GacRtUv)anKNnadUcxageRkam
= dCLbqV uu 22
1 !#>$RbsinebIEdkkMlaMgkat;TTwgminRtUv)aneRbI enaH dGacRtUv)anKNna edaysnt; cu VV =
bf
Vd
c
u
'2
12 1
= !#>%
4>3> kMlaMgkat;BIrTis kMlaMgpug 1uV Two-Way Shear (PunchingShear)
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Department of Civil Engineering viTasanCatiBhubeckeTskm12.ACI Code, Section 11.12.2GnuBaatersIusg;kMlaMgkat;TTwg cV enAkgeCIgtagEdlKanEdk
kMlaMgkat;TTwgsMrab;GMeBIkMlaMgkat;BIrTis esInwgtMltUcCageKbMputn
dbfV occ '12
41= !#>^
12
'422
dbfV
occ
+=
!#>&
12
'23
dbf
bdV oc
o
sc
+= !#>*
Edl = pleFobRCugEvgelIRCugxIrbs;ssr=ob brimaRtnmuxkat;eRKaHfak;EdlenAcMgay 2/d BIRkLapbnk muxkat;ssr
emIlrUbTI13>12=d kMBs;RbsiTPaBrbs;eCIgtag
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T.Chhay NPIC
Footing 283
sMrab;tMl 1cV nig 2cV eyIgeXIjfa 1cV lb; tUcCag 2cV enARKb;eBlEdl 2 b:uEn
2cV lb;tUcCag 1cV enARKb;eBlEdl 2> . enHbgajeGayeXIjfakMlaMgkat;TTwgGnuBaat
cV RtUv)ankat;bnysMrab;eCIgtagEvgxaMg. bMErbMrYlsMBaFdIBitR)akdtambeNayRCugEvgCamYynwgkarekIneLIgn . sMrab;rUbragdTeToteRkABIctuekaN KWCapleFobrvagTMhMEvgCageKbMputnRkLapbnkRbsiTPaBkgTisedAEvg elITTwgFMCageKbMputkgTisedAxIEkgnwgTisedAEvg.
sMrab;smIkar !#>* s RtUv)ansnt;esI 40 sMrab;ssrenAkNal/ esI 30sMrab;ssrenAxag nigesI20 sMrab;ssrenARCug. ersIusg;kMlaMgkat;TTwgrbs;ebtug 3cV bgajBI\TiBlnkMeNIn
ob elI d. sMrab;pleFobx !#>!0
oco
s
u
bfb
d
Vd
'2
12 22
+
=
!#>!!
kMlaMgkat;TTwgBIrTis 2uV nigkMBs;RbsiTPaB dcaM)ac;RbsinebIEdkkMlaMgkat;TTwgminRtUv)aneRbIGacRtUv)anKNnadUcxageRkam eyagtamrUbTI 13>12
a.
snt; d
b. kMNt; ob )(4 dcbo += sMrab;ssrkaer EdlRCuges
Ic .)(2)(2 21 dcdcbo +++= sMrab;ssrctuekaN EdlmanRCugesInwg 1c nig 2c
c. kMlaMgkat;TTwg 2uV eFVIGMeBIenAelImuxkat;EdlmanbeNay )(4 dcbo += b 1(2cbo = )(2) 2 dcd +++ nigkMBs; d. muxkat;enHrgnUvkMlaMgbBarcuHeRkam uP nigkMlaMg
bBareLIgelI uq smIkar !#>@. dUcenH2
2 )( dcqPV uuu += sMrab;ssrkaer !#>!@a
))(( 212 dcdcqPV uuu ++= sMrab;ssrctuekaNEkg !#>!@b
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Department of Civil Engineering viTasanCatiBhubeckeTskm4>
ersIusg;Bt;nigEdkeCIgtag Flexural Strength and FootingReinforcement
muxkat;eRKaHfak;sMrab;m:Um:g;Bt;ekItmanenABImuxpssr muxkat; nn / rUbTI 13>13.eKRtUvBinitemIlm:Um:g;Bt;enAelITisnImYyrbs;eCIgtag nigdak;brimaNEdkRKb;RKan;. sMrab;eCIgtagkaer nigssrkaer m:Um:g;Bt;mantMlesIKaTaMgBIrTis. edIm,IkMNt;muxkat;EdkcaM)ac;eKRtUveRbIkMBs;rbs;eCIgtagTaMgBIrTis. edaysarEtEdkenAkgTismYysitenAelIEdkenAkgTismYyeTot kMBs;Rb
siTPaBd
ERbRbYleTAtamGgt;pitrbs;EdleRbI. tMlmFmrbs;d
GacRtUv)anykmkeRbI. tMlsMrab;karGnuvtn_ dRtUv)ansnt;esI mmh 110 .
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T.Chhay NPIC
Footing 285
CaerOy kMBs;RbsiTPaBrbs;eCIgtagRtUv)anRKb;RKgedaykMlaMgkat;TTwg EdlcaM)ac;RtUvkarkMBs;eCIgtagFMCagkMBs;eCIgtagEdlRtUvvkaredaym:Um:g;Bt;. EdkBRgwgkgTisedAnImYyGac
RtUv)anKNnaenAkgkrNIGgt;rgkarBt;dUcxageRkam
=
bf
fAdfAM
c
ysysu
'7.1 !#>!#
m:ageTot PaKryEdkGacRtUv)ankMNt;dUcxageRkam smIkar $>@
( )
=
c
u
y
c
f
R
f
f
'85.0
211
'85.0
!#>!$
Edl 2/ bdMR uu = . enAeBlEdl uR RtUv)ankMNt; kRtUv)anTTYlBIsmIkar !#>!$.
tMrYvkarpleFobEdkGb,brmaenAkgGgt;rgkarBt;KWes
Inwg yf/4.1 enAeBlMPaf c 31' < nigesInwg yc ff 4/' enAeBl MPaf c 31' . b:uEn ACI Code, Section 10.5
bgajfasMrab;kMralxNEdlmankMras;esI RkLapGb,brma nigKMlatGtibrmanEdkenAkgTisedAnkarBt;KYrRtUvkarEdkrYmmaD nigEdksItuNPaB. tMrUvkarEdkGb,brmaelIkeRkayenHmantMltUcehIypleFobEdkGb,brmaEdlmantMlFMCagRtUv)anesIeLIg EtvaminKYrFMCag yf/4.1 .
EdkenAkgeCIgtagmYyTis nigeCIgtagBIrTisRtUvEtBRgayeBjTTwgeCIgtag. kgkrNIeCIgtagctuekaNBIrTis ACI Code, Section 15.4.4kMNt;faenAkgTisedAEvg EpknEdksrub ls RtUv)anEbgEckesIenAelITTwgrbs;eCIgtag. enAkgTisedAxI PaKryBitR)akdrbs;EdksrubenAkgTisedAenHRtUvEt)andak;esIenAkgbandwidthesInwgRbEvgnRCugxIneCIgtagGaRsynwg
1
2
+=
s !#>!%
Edlfootingofsideshort
footingofsidelong= !#>!^
BandwidthRtUvEtsitenAkNalnGkSrbs;ssr rUbTI13>14. EdkEdlenAsl;enAkgTisedAxIRtUvEtBRgayesIBIxageRkA Bandwidth . PaKryEdkenAsl;enHminKYrticCagEdkrYm maDnigEdksItuNPaB.
enAeBlEdlssreRKOgbgMGMBIEdk bssr\dRtUv)aneRbIenaHmuxkat;eRKaHfak;sMrab;m:Um:g;Bt;enAkgeCIgtagRtUv)anykenAcenaHBak;kNal nigEKmCBaaMg\dnigcenaHBak;kNalpssrnigEKmn steel base plate (ACI Code, Section 15.4.2).
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Department of Civil Engineering viTasanCatiBhubeckeTskm5> lTPaBRTRTg;rbs;ssrenAelIKl; Bearing Capacity of Column atBase
bnkmkBIssrmanGMeBIelIeCIgtagenAKl;rbs;ssr EdlmanRkLapesI
nwgRkLapmuxkat;ssr. kMlaMgsgt;RtUv)anbBanmkssredaypal;edaybearing enAelIebtug. kMlaMgEdlmanGMeBIenAelIebtugenARtg;Kl;nssrminRtUvelIslTPaBRTRTg;rbs;ebtugEdlkMNt;eday ACI Code,Section 10.17
lTPaBRTRTg; )'85.0( 11 AfN c= !#>!&Edl 65.0= nig =1A RkLapbearing nssr. tMlnlTPaBRTRTg;EdleGay
edaysmIkar13.17
GacRtUv)anKuNedayemKuN0.2/
12 AA
sMrab;bearing
enAelIeCIgtagenAeBlpEdlRTFMCagRkLapbnkenARKb;RCug. 2A enATIenHCaRkLapnEpkneCIgtagEdlrUbFrNImaRtdUcKa ehIyRtYtsIuKaCamYynwgRkLapbnk rUbTI13>15. edaysarEt 12 AA > enaHemKuN 12 /AA nwgFMCagmYy EdlbgajfalTPaBRTRTg;GnuBaatekIneLIgedaysarTMrxagnRkLapeCIgtagEdlBTCMuvijKl;ssr. lTPaBRTRTg;kMEN modified bearing strength KW
( )11
212 '85.02)'85.0( Af
A
AAfN cc = !#>!*
RbsinebIbnkemKuN uP FMCag 1N b 2N EdkRtUv)andak;edIm,IbBankMlaMgelIs. eKGacTTYlva)anedaydak;Edk dowel bEdkssrRtUv)andak;bgscUleTAkgeCIgtag. kMlaMgelIsKW
1NPP uex = ehIyRkLaprbs;Edk dowel KW 1005.0)/( AfPA yexsd = Edl 1A CaRkLaprbs;muxkat;ssr. y:agehacNas;EdkbYnedImRtUv)aneRbIbYnedImenARCugTaMgbYnrbs;ssr.
RbsinebIkMlaMgemKuNtUcCag 1N b 2N enaHeKdak;EdkGb,brma. ACI Code, Section15.8.2 bgajfaRkLapEdkGb,brmarbs;Edk dowel y:agehacNas;es
Inwg gA005.0 nigminRtUv
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T.Chhay NPIC
Footing 287
ticCagbYnedIm Edl gA CaRkLapeBj (gross section) rbs;muxkat;ssr. EdkGb,brmakRtUv)aneRbIEdrenAeBlEdlkMlaMgemKuNFMCag 1N b 2N . Edk dowel RtUv)andak;enARCugTaMgbYnrbs;ssr
ehIybgscUleTATaMgkgssr nigTaMgkgeCIgtag. Ggt;pitEdk dowel minKYrFMCagEdkbBarenAkgssr mm4 . tMrUvkarenHcaM)ac;edIm,IFanakareFVIkardlrvagssr nigeCIgtag. EdkbBasrbs;Edkdowel RtUv)anBinitemIledIm,IkMNt;nUvkarbBandlnkMlaMgsgt;eTAkgeCIgtag.
4>6> RbEvgEdkRCYs Development Length of the Reinforcing bars
muxkat;eRKaHfak;sMrab;RtYtBinitRbEvgEdkbgb;dUcKasMrab;m:Um:g;Bt;. RbEvgbgb;sMrab;
Edksgt;RtUv)aneGayenAkgemeronTI7
c
bydc
f
dfl
'
24.0=
b:uEnvaenHminRtUvtUcCag ybfd044.0 cm20 . sMrab;tMlepSgeToteyag tamemeronTI7.
4>7> sMrutDIepr:g;Esl karKNnaeCIgtagkglkxNlMnwgDifferential Settlement (Balanced Footing Design
CaTUeTAeCIgtagRTnUvbnkdUcxageRkam
-
bnkefrEdl)anmkBIeRKagxageRkam (substructure) nigeRKagxagelI(superstructure) .
-bnkGefrEdlGnuvtmkelI-TMgn;rbs;sMParEdleRbIsMrab;cak;bMeBj-bnkxl;
eCIgtagnImYyenAkgGKarRtUv)anKNnaedIm,IRTbnkGtibrmaEdlGacekItmanenAelIssr
Edl)anBIkarbnSMbnkdeRKaHfak;bMput edayeRbIsMBaFRTRTg;rbs;dIGnuBaat.
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Department of Civil Engineering viTasanCatiBhubeckeTskm eCIgtagebtugsuT Plain Concrete Footings
eCIgtagebtugsuTGacRtUv)aneRbIedIm,IRTCBaaMg\dbbnkRsal nigbBalbnkTaMgenaHeTAdI
Edlva. ACI CodeGnuBaateGayeRbIeCIgtagebtugsuTenAelIdI RbsinkugRtaMgKNnaminRtUvFMCagkrNIxageRkam- kugRtaMgrgkarBt;GtibrmasMrab;karTajRtUvEttUcCagbesInwg 12/'5 cf Edl
55.0= - kugRtaMgGtibrmaenAkgkMlaMgkat;TTWgmYyTis (beam action)RtUvtUcCagbesInwg 9/'cf
Edl 55.0=
-
kugRtaMgGtibrmaenAkgGMeBIBIrTisKW
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T.Chhay NPIC
Footing 289
cc ff '12
66.2'
9
2
9
1
+ Edl 55.0=
-
ersIusg;kMlaMgsgt;GtibrmaminKYrFMCagkarkMNt;rbs;lTPaBRTRTg;ebtugGnuBaat. cf' nebtugsuTminKYrtUcCag MPa17 .
-
kMras;Gb,brmarbs;eCIgtagebtugsuTminKYrtUcCag cm20 .- muxkat;eRKaHfak;sMrab;m:Um:g;Bt;KWsitenAprbs;ssr bCBaaMg.- muxkat;eRKaHfaksMrab;GMeBInkMlaMgkat;TTwgmYyTis nigkMlaMgkat;TTwgBIrTisKWsitenAcMgay
dnig 2/d BIpnssr bCBaaMg erogKa. eTaHbICaeCIgtagebtugsuTminRtUvkarEdkkedaykvaCakarEdlRbesIkgkardak;ssEdkrYmmaDsMrab;TisTaMgBIrrbs;eCIgtag.
-
kugRtaMgEdlbNalBIbnkemKuNRtUv)anKNnaedaysn
t;BRgayCaragbnat;enAkgebtug.- kMBs;RbsiTPaB dRtUv)anKitfaesInwgkMBs;srubdkeGay mm75 .-
sMrab;karBt;nigkMlaMgkat;mYyTis eRbImuxkat;eBj bh b:uEnsMrab;kMlaMgkat;BIrTis eRbI hbo edIm,IKNna cV .
]TahrN_ 3>
KNnaeCIgtagebtugBRgwgedayEdkedIm,IRTCBaaMgebtugEdlmanTTwg cm50 Edl
RTbnkefrmkN/5.379
EdlrYmbBalbnkpal;rbs;CBaaMg nigRTnUvbnkGefrmkN/292
. )atrbs;eCIgtagsitenACMerA m8.1 BInIv:UdI. eKeGay MPaf c 28' = / MPafy 400= nigsMBaFdIGnuBaat2/24024.0 mkNMPa= .
dMeNaHRsay
1>
KNnasMBaFdIRbsiTPaB. snt;kMBs;srubrbs;eCIgtagKW cm50 . TMgn;rbs;eCIgtagKW2
/5.12255.0 mkN= . edaysnt;TMgn;maDrbs;dIesInwg 3/16 mkN
enaHTMgn;dIbMeBjBIelIeCIgtagKW2/8.20)5.08.1(16 mkN=
.bnkCBaaMgEdlbgb;enAkgdIKW m1/)5.08.1(5.025 2/25.16 mkN= .bnkCBaaMgebtugbgt;kgdIKitCadI 2/4.101/)5.08.1(5.016 mkNm= .sMBaFdIRbsiTPaBenA)atrbs;eCIgtagKW 2/85.2004.1025.168.205.12240 mkN=+ .
2>
KNnaTTwgrbs;eCIgtagsMrab;CBaaMgRbEvg m1 TTwgrbs;eCIgtag = bnksrub sMBaFdIRbsiTPaB
pressuresoileffective
loaltotalfootingofwidth =
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Department of Civil Engineering viTasanCatiBhubeckeTskm
sMBaFdIsuT= bnkemKuN TTwgeCIgtag sMrab;RbEvg m1 mkNLDPu /6.9222926.15.3792.16.12.1 =+=+=
sMBaFdIsuT (net upward pressure)= 2/4.2714.3
6.922mkNqu ==
4>epgpat;kMBs;snt;sMrab;tMrUvkarkMlaMgkat;TTwg. kMras;karBarEdksMrab;eCIgtagKW mm75 ehIysnt;eRbIEdk 25DB enaH mmd 4131275500 == . muxkat;eRKaHfak;sMrab;kMlaMg
kat;TTwgmYyTisKWsitenAcMgayd
BIpnBaaMgkN
cd
BqV uu 28.010
2
500413
2
34004.271
22
6 =
=
=
kMlaMgkat;TTwgmYyTisGnuBaat= 9.02817.0 =
dEdlRtUvkar mmbf
V
c
u 41519.075.0
280
'17.0=
==
kMBs;srubKW mm5021275415 =++ b mm500 . dCak;EsgKW mm4131275500 = dUckarsnt;.cMNaMfa eKnwgRtUvkarkarsakl,gmYycMnYnedIm,Isn
t;nigKNnatMl deGaymantMlEk,r.5>KNnam:Um:g;Bt;nigEdk. muxkat;eRKaHfak;KWsitenApnCBaaMg
mkNcB
qM uu .3.2852
5.0
2
4.3
2
4.271
222
122
=
=
=
MPabd
MR
uu 67.1
4131000
103.2852
6
2 =
==
sMrab; MPaRu 67.1= / MPaf c 28' = nig MPafy 400= enaHPaKryEdk
( )0048.0
2885.09.0
67.1211
400
2885.0
'85.0
211
'85.0=
=
=
c
u
y
c
f
R
f
f
PaKryEdkGb,brmasMrab;Ggt;rgkarBt;
0035.0400
4.14.1min ===
yf
PaKryEdkrYmmaDKW %18.0 sMrab; MPafy 400= . dUcenHeRbI 0048.0= dUcEdl)an
KNnammmAs /4.198241310000048.0
2==
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T.Chhay NPIC
Footing 291
eRbIEdk 25DB EdlmanKMlat mm225 22182mmAs = 6>
RtYtBinitRbEvgEdkbgb;sMrab;Edk 25DB
mmdl bd 1200254848 === eyagtamemeronTI 7EdleGay
mmcB
ld 1375752
500
2
340075
22===
7> KNnaEdkrgkgTisedAbeNayeCIgtag mmmAs /90050010000018.0 2== eRbIEdk 16DB KMlat mm200 21005mmAs = . bg;lMGitRtUv)anbgajenAkgrUbTI13>16.
]TahrN_ 3>2
KNnaeCIgtag single footingedIm,IRTssrebtugeRbIEdkkgFmtasitenAxagkgEdleRbI 288DB . ssrenHRTnUvbnktamGkSGefrKanemKuN kN1090 nigbnkcMGkSefrKanemKuN kN890 . )atrbs;eCIgtagsitenACMerA mm1200 BInIv:UdIehIysMBaFdIGnuBaatKW 2/240 mkN .eKeGay MPaf c 28' = / MPafy 400= .dMeNaHRsay
1>KNnasMBaFdIRbsiTPaB. snt;kMras;srubrbs;eCIgtag mm600 . TMgn;eCIgtagKW 256.0 2/15 mkN= . bnkdIenABIelIeCIgtag snt;TMgn;maDrbs;dIesInwg 3/16 mkN KW 166.0 2
/6.9 mkN=
sMBaFdIRbsiTPaBKW= 2/4.2156.915240 mkN==
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Department of Civil Engineering viTasanCatiBhubeckeTskmKNnaRkLaprbs;eCIgtagbnkeFVIkar kNLD 19808901090 =+=+=
RkLapeCIgtag 22.94.2151980 m== RCugrbs;eCIgtagKW m03.3= dUcenHeRbI m3= rUbTI13>17
3>sMBaFdIsuT= bnkemKuN RkLapeCIgtag
kNLDPu 27328906.110902.16.12.1 =+=+= sMBaFdIsuT (net upward pressure)= 2/6.303
33
2732mkNqu =
=
4>
epgpat;kMBs;sn
t;EdlbNalmkBIkMlaMgkat;TTwgBIrTis. RbsinebIeKGt;eRbIEdkkMlaMgkat;TTwg enaHkMlaMgkat;TTwgBIrTiskMNt;kMBs;caM)ac;rbs;eCIgtag. sMrab;kMBs;eCIgtagsrubsnt;
mm600 KNna d eTAGkSTIRbCMuTMgn;nEdkRsTab;xagelIedIm,Idak;enAkgeCIgtagTaMgBIrTis.eRbIEdk 15DB sMrab;KNna d.
mmd 4883775600 ==
vaCakarRbesIrEdlsn
t;112=hd
( ) ( ) mmdcbo 375248845044 =+=+=
mmdc 938488450 =+=+ ( ) ( ) kNdcqPV uuu 9.2464488.0450.06.3032732
222 =+=+=
1d caM)ac;oc
u
bf
V
'
3 2
= mm6.496
37522875.0
24649003=
= 1= smIkar !#>(
2d caM)ac;oc
os
u
bfb
d
V
'2
12 2
+
=
mm8.27537522823752
48840
75.0
246490012=
+
=
40=s sMrab;ssrenAkNal edaysar dd >1 snt;dUcenHeyIgRtUveFVIkarKNnasakl,grhUtdl; 1d nig dmantMlRbEhlKa. eRkayBIkarKNnamkeyIgTTYl)an
mmh 610= / mmd 498= / mmd 5.4951 = . dUcenH kMBs;snt;elIkeRkay mmh 610= RKb;RKan;.
5>RtYtBinitkMBs;EdlbNaledaysarGMeBIkMlaMgkat;mYyTis muxkat;eRKaHfak;enAcMgay dBIpssr
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T.Chhay NPIC
Footing 293
cMgayBIcugeCIgtag mmdcL 77722
=
=
kNVu 7.7073777.06.3031 == kMBs;caM)ac;sMrab;kMlaMgkat;TTwgmYyTisKW
mmmmbf
Vd
c
u 49835030002817.075.0
707700
'17.075.0
1
KNnaEdk nigm:Um:g;Bt;. muxkat;eRKaHsitenApssr. cMgayBIcugeCIgtagKW
mmcL
1275225150022
==
mkNbcL
qM uu .3.7403275.16.303
2
1
222
1 22
==
=
MPa
bd
MR uu 995.0
4983000
103.740
2
6
2 =
==
BIsmIkar !#>!$ eyIg)an 0028.0= 22.418349830000028.0 mmbdAs ===
sA Gb,brma EdkrYmmaD 22 2.41832.268949830000018.0 mmmm RtYtBinitkugRtaMgRT (bearing stress)a. ersIusg;RT (bearing strength) 1N enA)atrbs;ssr 21 450450 mmA = KW
kNAfN c 7.3132104504502885.065.0)'85.0(3
11 ===
b. ersIusg;RT (bearing strength) 2N enApxagelIrbs;eCIgtag 22 33 mA = KW
11
212 2N
A
ANN =
22 9000000mmA = 21 202500mmA =
267.6202500
9000000>=
dUcenH kNNN 4.62652 12 == . edaysar 12732 NkNPu
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Department of Civil Engineering viTasanCatiBhubeckeTskm
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T.Chhay NPIC
Footing 295
]TahrN_ 3>3 KNnaeCIgtagragctuekaNsMrab;ssrn]TahrN_TI13>2 RbsinebIRCugmYyrbs;eCIgtagRtUv)ankMNt;esI m6.2 .
dMeNaHRsay1>viFIsaRsKNnasMrab;eCIgtagctuekaNmanlkNRsedogKanwgkarKNnaeCIgtagkaer eday
KitBicarNaGMeBIrbs;kMlaMgmkelIeCIgtagtmaTisnImYydac;edayELkBIKa.2>BI]TahrN_mun RkLapcaM)ac;rbs;eCIgtagKW 22.9 m
beNayeCIgtag m54.36.2
2.9==
dUcenHyk m6.3 rUbTI13>18. TMhMeCIgtagKW 26.36.2 m
3>
kNPu 2732= . dUcenH sMBaFdIsuT(net upward pressure)KW2/9.291
6.36.2
2732mkNqu =
=
4>
RtYtBinitkMBs;EdlbNalBIkMlaMgkat;TTwgmYyTis. muxkat;eRKaHfak;sitenAcMgay dBIprbs;ssr. sMrab;TisedAEvg
bqdcL
V uu
=
221
kN4.8176.29.291498.0245.0
26.3 = = kMlaMgkat;TTwgenHlb;
sMrab;TisedAxI kNVu 3.6061 = mineRKaHfak;
dcaM)ac; mmbf
V
c
u 47526002875.0
104.8176
'
6 31 =
==
dEdleRbI mmmm 475498 >= 5> RtYtBinitGMeBIkMlaMgkat;TTwgBIrTis kMlaMgkat;pug (punching shear). muxkat;eRKaHfak;
enAcMgay 2/d BIpssrTaMgbYnRCug.( ) mmbo 37924984504 =+=
( ) mmdc 948498450 =+=+ 238.1
6.2
6.3
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T.Chhay NPIC
Footing 297
202DB 2628mmAs = enAelIRbEvg m5.0 enAelIRCugnImYysgagcMerok m6.2 .cMnYnEdksrubKW19 edIm. enAkg]TahrN_enH EdkRtUv)anBRgayedayKMlatesIKa elIRbEvg
m6.3 / ( ) mmS 19218/1503600 == . bg;lMGitssrEdkRtUv)anbgajenAkgrUbTI!#>!*.
8>
RtYtBinitkugRtaMgRTenA)atssr dUcEdl)anBnl;enAkg]TahrN_mun. eRbIEdk dowel25DB cMnYn 4 edIm.
9> RbEvgbgb;rbs;Edkem mmld 960= sMrab; 20DB nig mmld 1344= sMrab; 28DB .
dl Edldak;TisEvg mm1500752
450
2
3600=
=
dl Edldak;TisxI mm1000=
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Department of Civil Engineering viTasanCatiBhubeckeTskm4 KNnaRkLapeCIgtagcaM)ac;sMrab;sMrutesIKa karKNnaeCIgtagEdlmanlMnwg(balanced footing design) RbsinebIbnkGefrFmta (usual live load)esI %20
sMrab;RKb;eCIgtagTaMgGs;. eCIgtagrgnUvbnkefr nigbnkGefrdUcbgajenAkgtaragxageRkam.sMBaFdIsuTGnuBaat (allowable net soil pressure) esI 2/287 mkN .
elxeCIgtag1 2 3 4 5
bnkefr kN535 kN800 kN620 kN845 kN935
bnkGefr kN670 kN980 kN890 kN755 kN1070
dMeNaHRsay1>kMNt;eCIgtagEdlmanpleFobbnkGefrelIbnkefrFMCageK. enAkg]TahrN_enH eCIgtag
elx 3 manpleFob 44.1 FMCagpleFobdT.2>KNnabnkFmtasMrab;RKb;eCIgtagTaMgGs;. bnkFmtaKWCabnkefr nigEpknbnkGefr
EdlmanGMeBIrCaTUeTAenAelIeRKagsMNg;. enAkg]TahrN_enHbnkFmta ).(2.0. LLLD +=
tMlnbnkFm
taRtUv)anbgajenAkgtaragxageRkam.3>kMNt;RkLaprbs;eCIgtagEdlmanpleFob LDLL ./.
RkLapeCIgtagelx 3 226.5287
890620
pressuresoilallowable
..m
LLLD=
+=
+=
sMBaFdIFmtaeRkameCIgtagelx 3 KW2/7.151
26.5
798
footingofArea
loadUsualmkN==
4>
KNnaRkLapcaM)ac;sMrab;eCIgtagnImYyedayEckbnkFm
tarbs;vaedaysMBaFdIenAeRkameCIgtagelx 3. RkLaprbs;vaRtUvbgajenAkgtaragxageRkam. ]TahrN_eCIgtagelx 1RkLapcaM)ac;rbs;vaesI 241.47.151/669 m= .
5>
KNnasMBaFdIGtibrmaeRkameCIgtagnImYy2
max /287 mkNarea
LDq
+= sMBaFdIGnuBaat
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T.Chhay NPIC
Footing 299
elxeCIgtag1 2 3 4 5
loadLiveloadDead 25.1 225.1 44.1 89.0 14.1
bnkFmta ).(2.0. LLLD += )(kN 669 996 798 996 1149 RkLapcaM)ac;
151.7
loadUsual= )( 2m 41.4 57.6 26.5 57.6 57.7
sMBaFdIGtibrmaarea
LD+= )/( 2mkN
2.273 9.270 87.2 5.243 9.264
]TahrN_ 3>5 KNnaeCIgtagebtugsuTedIm,IRTCBaaMgebtugEdlmankMras; mm400 . bnkEdlmanGMeBIelICBaaMgrYmmanbnkefr mkN/5.233 rYmbBalbnkpal;rbs;CBaaMgrYc nigbnkGefr
mkN/146 . )atrbs;eCIgtagsitenACMerA mm1200 BInIv:UdI. eKeGay MPaf c 20' = nigsMBaFdIGnuBaat 2/240 mkN .dMeNaHRsay
1>
KNnasMBaFdIRbsiTPaB. snt;kMBs;srubeCIgtagKW mm710
TMgn;rbs;eCIgtag 2/172471.0 mkN== edaysnt;TMgn;maDdIesI 3/16 mkN enaHTMgn;rbs;dIenAelIeCIgtagesI 16)71.02.1(
2/84.7 mkN= .sMBaFdIRbsiTPaBKW 2/16.21584.717240 mkN= .
2>
KNnaTTwgeCIgtagsMrab;CBaaMgRbEvg m1 mb 1=
pressuresoileffective
loadtotalfootingofwidth =
m76.116.215
1465.233=
+= yk m8.1 rUbTI13>19
3>
mkNLDU /8.5131466.15.2332.16.12.1 =+=+= sMBaFdIsuT(net upward pressure)esI 2/4.2858.1/8.513 mkNqu ==
4> RtYtBinitkugRtaMgBt;. muxkat;eRKaHfak;KWsitenApCBaaMg. sMrab;RbEvg m1 nCBaaMgnigeCIgtag
mkNcLqM uu .9.6924.0
28.14.285
21
2221
22
=
=
=
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Department of Civil Engineering viTasanCatiBhubeckeTskm Combined Footings
enAeBlEdlssrmanTItaMgsitenAEk,rRBMenaHEpkneCIgtag single footingGaclycUleTAkgRBMGkCitxag. edIm,IeCosvagsanPaBEbbenH eKGacdak;ssrenAelIRCugEKmneCIgtagbegIt)anCabnkcakpit. eKminGaceRbIdMeNaHRsayenHsMrab;lkxNxH nigeBlxHvaCadMeNaHRsayEdlminsnSMsMc. karKNnadlGacTTYledalbBaleCIgtagCamYynwgeCIgtagssrxagkgEdlsit
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T.Chhay NPIC
Footing 301
enACitCageK begIt)anCa combined footing. TIRbCMuTMgn;rbs;combined footing RtYtsIuKaCamYynwgkMlaMgpbnssrTaMgBIr.
krNIepSgeTot Edlcombined footingcaM)ac;RtUv)aneRbIKWenAeBlEdldImanlkNexSayehIyeCIgtagssrmYyKgelIeCIgtagenAEk,r. ragrbs;eCIgtag combined footingGacCactuekaNEkg bctuekaNBay rUbTI 13>20. enAeBlEdlbnkssrxagenAEk,rRBMmantMlFMCagbnkssrkg eCIgtagmanragctuekaNBayGacRtUv)aneRbIedIm,IrkSaTIRbCMuTMgn;eCIgtagenAelIExSCamYynwgbnkpbnssrTaMgBIr. CaTUeTA eKcUlciteRbIeCIgtagragctuekaNEkg.
beNay nigTTwgrbs;eCIgtagRtUv)aneRCIserIsedaykMeNInmg mm75 EdlGacbNaleGay
sMBaFBRgayes
IenAeRkameCIgtagERbRbYltUc. sMrab;sMBaFBRgayes
IeLIgelI(uniform upwardpressure)eCIgtagnwgdabdUcbgajenAkgrUbTI13>21. ACI Code, Section 15.10min)anpl;nUvviFIKNnalMGitsMrab; combined footingeT. CaTUeTA karKNnaQrelIkarviPaKeRKOgbgM (structuralanalysis).
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Department of Civil Engineering viTasanCatiBhubeckeTskm22. eKkGaceRbITTwgEdlmantMltUcCagrhUtdl; dc+ .
]TahrN_ 3>6 KNnaeCIgtag combined footingragctuekaNEkgedIm,IRTssrBIrdUcbgajkgrUbTI 13>23. ssrxagelx Imanmuxkat; mm400400 nigRTnUv ..LD kN800 nig LL. kN535 .ssrxagkgelx IImanmuxkat; mm500500 nigRTbnk ..LD kN1115 nig LL. kN625 . sMBaFdIGnuBaatKW 2/240 mkN ehIy)atrbs;eCIgtagsitenACMerA m5.1 BInIv:UdI. KNnaeCIgtagedayeRbI
MPaf c 28' = / MPafy 400= nigviFIKNnaersIusg; ACI.
dMeNaHRsay
1>kMNt;TItaMgkMlaMgpbnbnkssr. Kitm:Um:g;CMuvijGkSnssrxagelx I
mx 7.2772)535800()6251115(
4900)6251115(=
+++
+= BIssr I
cMgayBIkMlaMgpbmkExSRBMKW mm7.33726007.2772 =+ . RbEvgrbs;eCIgtagKWmm4.674527.3372 = yk mm6750 . kgkrNIenHkMlaMgpbrbs;ssrRtYtsIuKaCamYy
nwgkMlaMgpbrbs;sMBaFdIEdlmanGMeBIelIeCIgtag.
2>
kMNt;RkLaprbs;eCIgtag. sn
t;kMBs;eCIgtagsrub mm920 mmd 805115920 ==
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T.Chhay NPIC
Footing 303
bnkeFVIkarsrub kN30756251115535800 =+++= Total actual (working)loadsMBaFdIfI 2/72.2071658.02592.0240 mkN== New upward pressure
sn
t;TMgn;maDdI 3/16 mkN RkLapcaM)ac; 28.14
72.207
3075m== Required area
TTwgeCIgtag m19.275.6
8.14== Width of footing
ykTTwgeCIgtagesI m2.2 . dUcenHTMhMeCIgtagKW m2.275.6 RkLap 285.14 m 3>kMNt;sMBaFdIemKuN factored soil pressure edayeRbIbnkemKuN
1uP
ssrelxI
kN18165356.18002.1 =+=
2uP ssrelx II kN23386256.111152.1 =+=
sMBaFdIemKuNsuTKW ( ) 2/73.27985.14/23381816 mkNqu =+= net factored soilpressure
4>KUrdaRkamkMlaMgkat;TTwgemKuNsMrab;FwmEdlmanRbEvg mmL 6750= EdlenAelIssrBIrnigrgnUvsMBaFdI mkN/4.6152.273.279 = kgRbEvgeCIgtag m1
uV
enApxageRkArbs;ssrI
kN16.246)2.06.0(4.615 ==
uV enApxagkgrbs;ssr I ( ) kN68.13232.06.04.6151816 =+=
uV enApxageRkArbs;ssr II kN4.615)25.025.1(4.615 ==
uV enApxagkgrbs;ssr II kN9.1414)25.025.1(4.6152338 =+= 5>KUrdaRkamm:Um:g;emKuNedayKiteCIgtagCaFwmEdlman mmL 6750= RTedayssrBIr.
sMBaFdIBRgayesI mkN/4.615
1uM enApxageRkAssr I mkN.2.4924.0
4.615
2
== 2uM enApxagkgssr II mkN.7.307
2
14.615
2
==
m:Um:g;GtibrmaekItmanenAkMlaMgkat;TTwgesIsUn
uM GtibrmaKNnaBIssr I ( ) ( )26.02.015.22
4.6152.015.21816 +++=
mkN.84.1589=
uM
GtibrmaKNnaBIssrII
( ) ( )2
25.125.03.22
4.61525.03.22338 +++=
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Department of Civil Engineering viTasanCatiBhubeckeTskm
RtYtBinitkMBs;sMrab;kMlaMgkat;mYyTis. kMlaMgkat;TTwgGtibrmaekItmanenAcMgaymmd 805= BIpssrxagkg II rUbTI 13>23.
kNVu 5.919805.04.6159.14141 == mm
bf
Vd
c
u 5.61928220017.075.0
919500
'17.0
1 =
==
kMBs;RbsiTPaBEdleGayKW mmmmd 5.619805 >= dUcenHeCIgtagmanlkNRKb;RKan;.7>RtYtBinitkMBs;sMrab;kMlaMgTTwgBIrTis kMlaMgkat;pug. sMrab;ssrxagkg
( ) ( ) mmdcbo 522080550044 =+=+= ( ) ( ) mmdc 1305805500 =+=+ kMlaMgkat;TTwg 2uV enAmuxkat; 2/d BIRKb;RCugrbs;ssresI
kNdcqPVuuu
6.1861305.173.2792338)( 22
22
==+=
mmmm
bf
Vd
oc
u 8056.26952202875.0
18616003
'
3 2
RtYtBinitkMBs;sMrab;m:Um:g;nigkMNt;ssrEdkcaM)ac;enAkgTisEvgm:Um:g;Bt;Gtibrma mkN.84.1589=
MPa
bd
MR uu 115.1
8052200
1084.15892
6
2 =
==
GnuvtkgsmIkar !#>!$ PaKryEdkKW ( )min0033.00032.0 = 23.584480522000033.0 mmAs ==
sA Gb,brma rYmmaD 22.364392022000018.0 mm== 23.5844 mmAs = lb;. eRbI 2810DB 25.6157 mmAs =
KMlatEdk mm228spacing)of(no.9
cover)(concrete1502200=
=
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T.Chhay NPIC
Footing 305
EdkRtUv)andak;bgtenAcenaHssrenAEpkxagelIeCIgtagCamYykMras;karBarEdk mm75 .dak;EdkGb,brmaenA)atrbs;eCIgtagedIm,ITb;nwgm:Um:g;viCman. RtYtBinitRbEvgbgb; dl BIp
ssr.EdkGb,brmaKW 22.3643 mmAs = . eRbI 258DB 23927mmAs = .RbEvgEdkbgb;caM)ac;sMrab;EdkemxagelIKW mmdl bd 1747483.13.1 == RtUv)andak;ecjBIcMnucm:Um:g;Gtibrma. RbEvgEdkbgb;Edldak;enARtg;ssrTaMgBIrKWRKb;RKan;.
9>sMrab;EdkenAkgTisedAxI. karKNnam:Um:g;Bt;enAkgTisedAxITisedATTwg maklkNdUcKakgkrNIsingle footing. EdkenAeRkamssrnImYy RtUv)andak;enAkgcMerokTTwg
(bandwidth) Edles
InwgplbUkTTwgssrnigkMBs;RbsiTPaB dBIrdg rUbTI!#>@$.a.
EdkenABIeRkamssr IBandwidth 805column)ofsideexterior(on040dth)(column wi400 ++=
mm1605= eRbI m6.1 . sMBaFdIeLIgelIsiTenAkgTisedAxIeRkamssr IKW
mkNPu /5.825
2.2
1816
footingofwidth
1 ==
cMgayBIcugTMenreTApssrKW mm900240022200 =
uM enApnssr I mkN.3.3349.02
5.825 2 ==
MPabd
MR uu 32.0
8051600
103.3342
6
2 =
==
PaKryEdk tUcCagPaKryEdkGb,brmasMrab;EdkrYmmaD 0018.0 .2
min 6.264992016000018.0 mmAs ==
eRbI 256DB 22.2945 mmAs = dak;enAkgbandwidthRbEvg m6.1 .b.
EdkenABIeRkamssr IIBandwidth mm2110805805500 =++=
eRbI mm2100 . sMBaFdIeLIgelIsiTenAkgTisedAxIeRkamssr IIKW
mkNPu /7.1062
2.2
2338
footingofwidth
2 ==
cMgayeTApssrKW mm8502
500
2
2200=
uM enApnssr IIkgTisedAxI mkN.9.38385.02
7.1062 2 ==
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Department of Civil Engineering viTasanCatiBhubeckeTskm@# nig !#>@$. RbEvgbgb;rbs;Edk 25DB enAkgTisedAxIKW m2.1 .
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Department of Civil Engineering viTasanCatiBhubeckeTskm@!
2>enAeBl 6// LPMe == sMBaFdImanragctuekaNEkg
LB
P
BL
M
LB
Pq
262max
=+= !#>@@
2min
60
BL
M
LB
Pq == b
2
6
BL
M
LB
P= !#>@#
3>
enAeBlEdl 6/Le> sMBaFdImanragRtIekaN
eLyL
x =
= 23
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T.Chhay NPIC
Footing 309
Bx
qP
=
2
3max
)2(3
4
3
2max
eLB
P
xB
Pq
== !#>@$
4> enAeBleCIgtagRtUv)anrMkilcMgay e BIGkSnssredIm,IbegItsMBaFdIBRgayesIenAeRkameCIgtag. m:Um:g;GtibrmaekItmanenAmuxkat; nn
HhMM = ' nigP
Me=
8> eCIgtageRkamm:Um:g;BIrTis Footings under Biaxial Moment
enAkgkrNIxH eCIgtagGacrgnUvkMlaMgtamGkSnigm:Um:g;Bt;BIrTisCMuvijGkSx
nigGkSy
dUckrNIm:asIunscEdlbgVilxn)an o360 . enaHeCIgtagRtUv)anKNnasMrab;bnkeRKaHfak;.tamrUbTI 13>26 RbsinebIbnkcMGkS P manGMeBIenAcMgay xe BIGkSy nig ye BIGkSx .
enaH
yx PeM = nig xy PeM =
sMBaFdIenARCug ! KWy
xy
x
yx
I
cM
I
cM
A
Pq ++=max
enARCug @ KWy
xy
x
yx
I
cM
I
cM
A
Pq +=2
enARCug # KWy
xy
x
yx
I
cM
I
cM
A
Pq =3
enARCug $ KWy
xy
x
yx
I
cM
I
cM
A
Pq +=4
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Department of Civil Engineering viTasanCatiBhubeckeTskm7 ssrctuekaNEdlmanmuxkat; mm600300 dUcbgajkg rUbTI13>27 argnUvbnkcMGkS kNPD 980= nigm:Um:g; mkNMD .244= EdlbNalBIbnkefr nigbnkcMGkS
kNPL 734= nigm:Um:g; mkNML .190= EdlbNalBIbnkGefr. )atrbs;eCIgtagsitenACMerAm5.1 BInIv:UdIehIysMBaFRTRTg;dIGnuBaatKW 2/240 mkN . KNnaeCIgtagedayeRbI MPaf c 28' = /
MPafy 400= .dMeNaHRsay
eCIgtagrgnUvbnkcMGkSnigm:Um:g;kNP 1714734980 =+=
mkNM .434190244 =+= cMNakpitKW m
P
Me 253.0
1714
434=== yk mm250
eKGacKNnaeCIgtagtmaviFIsaRsBIrKWviFIsaRsTI1 rMkilGkSeCIgtagcMgay mme 250= BIGkSssr. kgkrNIenH sMBaFdIRtUv)an
cat;TukfaBRgayes
IenABIeRkameCIgtag rUbTI 13>27b.viFIsaRsTI2 GkSrbs;eCIgtag nigGkSrbs;ssrRtYtsIuKa. kgkrNIenH sMBaFdImanragCa
RtIekaN bctuekaNBay rUbTI 13>27 c ehIytMlGtibrma nigGb,brmaRtUv)anKNnadUcbgajenAkgrUbTI13>27.
karGnuvtn_nviFIsaRsTaMgBIrsMrab;]TahrN_TI13>7 GacnwgBnl;y:agsegbdUcxageRkam1> sMrab;viFIsaRsTI1 snt;kMBs;eCIgtag mm500 mmd 420= nigsnt;TMgn;maDdIesI
3/16 mkN sMBaFdIeLIgelIsuTKW 2/5.211161255.0240 mkN=
RkLapeCIgtag 21.85.211
1714m==
snt;TTwgeCIgtagKW m7.2 enaHeCIgtagmanbeNay m37.2/1.8 = . dUcenHeyIgeRCIserIseCIgtagEdlmanTMhM m37.2 nigssrmanTItaMgcakpitdUcbgajkgrUbTI 13>27 d. GkS
eCIgtagmancMgaymm250
BIGkSssr.
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T.Chhay NPIC
Footing 311
2> \LvviFIsaRsKNnamanlkNRsedogKanwgkarKNnaeCIgtageTal (single footing).RtYtBinitkMBs;eCIgtagsMrab;GMeBIkMlaMgkat;TTwgmYyTis nigkMlaMgkat;TTwgBIrTis. kMNt;m:U
m:g;Bt;enApssrsMrab;TisxInigTisEvg. edaysarcMNakpitrbs;eCIgtag muxkat;eRKaHfak;nwgsitenAxageqVgnpssr dUcbgajkgrUbTI13>27 d. cMgayeTAcugeCIgtagKW mm1450
kNLDPu 4.23507346.19802.16.12.1 =+=+= 2/2.290
37.2
4.2350mkNqu =
=
m:Um:g;Gtibrma mkNMu .7.8232
45.17.22.290
2
== enAelITTwg m7.2
enAkgTisedAxI mkNMu .8.62622.1
32.290
2
== BinitelIgvijkMBs;eCIgtagEdl)ansnt;RbsinebIcaM)ac;nigeRCIserIsbrimaNEdkcaM)ac;enAkgTisTaMgBIrrbs;eCIgtag dUcEdl)anBnl;enAkg]TahrN_GMBIeCIgtageTal (single footing).
3> sMrab;viFIsaRsKNnaTI2 KNnaRkLaprbs;eCIgtagtamviFIdUcEdl)anBnl;enAkgviFIsaRsTI1 bnab;mkKNnasMBaFdIGtibrma nigeRbobeFobvaCamYynigsMBaFdIGnuBaatEdleRbIbnkFmta
bnksrub kNP 1714= TMhMrbs;eCIgtag m37.2 = edaysarcMNakpitKW mmLmme 5006/30006/250 ===
+
=+=
eCIgtagKansuvtiPaB. sakl,g m48.2 RkLap 22.11 m= 22
22max/5.211/2.211
48.2
4346
48.2
17146mkNmkN
BL
M
LB
Pq KNnasMBaFeLIgelIemKuNedayeRbIbnkemKuN bnab;mkKNnam:Um:g; nigkMlaMgkat;TTwg dUcBnl;kg]TahrN_mun.
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Department of Civil Engineering viTasanCatiBhubeckeTskm kMralxNelIdI Slabs on Ground
kMralxNebtugEdldak;pal;elIdIGacnwgrgnUv- bnkBRgayesIenAelIprbs;va EdlbegIt)anCakMlaMgkgtUc
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T.Chhay NPIC
Footing 313
- bnkcMcMnuc bbnkBRgayminesIEdlbegItm:Um:g;Bt;nigkMlaMgkat;. kugRtaMgkMlaMgTajekIteLIg ehIysameRbHnwgekItmanEpkxHrbs;kMralxN.
kugRtaMgTajCaTUeTAekItmanedaybnSMn- karrYj (contraction)EdlbNalmkBIsItuNPaB nigkarrYmmaD EdlbgaMgedaykMlaMgkkit
rvagkMralxNnig subgradebegItCakugRtaMgTaj.- karxUcragmuxkat;rbs;kMralxNedaykarmYl (warping of the slabe).- lkxNnkardak;bnk- sMrut
tMN contraction joint RtUv)anbegIteLIgedIm,Ikat;bnykugRtaMgTajenAkgkMralxN. tMNexpansion joint RtUv)andak;kMralxNesIgEdlmankMras;rhUtdl; mm250 .
kMralxNCan;eRkamdIneRKagsMNg;GKarsak;enAGacCaebtugGarem:EdlmankMras;BI mm100 eTA mm150 EdlBRgwgedaysMNaj;Edk. sMrab;XaMg kMralxNGacmankMras;BI mm150 eTA
mm300 GaRsyelIbnkenAelIkMralxN. kMralxNCan;eRkamdIRtUv)anKNnaedIm,ITb;nwgsMBaFdIeLIgelInigsMBaFTwk. RbsinebIkMralxNsitenAelIdIEdlmanlkNesrPaB bENn(incompressible soil) enaHsMrutDIepr:g;EslRtUv)anecal. kgkrNIenH kMras;kMralxNGacGb,brmaRbsinebIKanRsTab;TwkeRkamdI. RbsinebIsMrutDIepr:g;EslFMenaHkMralxNRtUv)anKNnaCastiff raft foundation.
10> eCIgtagenAelIssrRKwH Footings on Piles
enAeBlEdlRsTab;dImanlkNTn;enAkgkMras;dRkas;ehIylTPaBRTRTg;rbs;vatUc eKnwg
minENnaMeGaydak;eCIgtagedaypal;enAelIdIeT. vaCakarRbesIrkgkarbBankMlaMgtamssrRKwHeTARsTab;deRCAEdlmanlkNrwgRKb;RKan;edIm,IRTbnk bbegItkMlaMgkkitRKb;RKan;CMuvijpxagssrRKwH.
ssrRKwHCaeRcInRbePTRtUv)aneRbIsMrab;RKwH. kareRCIserIsssrRKwHGaRsyelIlkxNdI/vtmanRsTab;TwkeRkamdI/ tYrnaTIrbs;ssrRKwH nigfvikar. ssrRKwHGaceFVIBI ebtug Edk beQI.
CaTUeTA eCIgtagssrRKwH (pile cap) mansarsMxan;kgkarEbgEckkMlaMgBIssreTAk,al
ssrRKwH. eCIgtagssrRKwH (pile cap)RtUvmanTMhMRKb;RKan;edIm,IQrelIssrRKwH. eCIgtagssrRKWH
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Department of Civil Engineering viTasanCatiBhubeckeTskm