បេតុងពង្រឹងដោយដែក 9 ix-one-way-slab

T.Chhay NPIC

kMralxNÐmYyTis 173

IX. kMralxNÐmYyTis

1> RbePTkMralxNÐ eRKOgbgÁúMkMralxNÐebtugRtUv)ansagsg;eLIgedIm,Ipþl;nUvépÞrabes μ I CaTUeTAmanTisedAedk. kMral

xNÐGacRTedayCBa¢aMg b¤edayFñwmebtugsésrEdkEdlCaTUeTARtUv)ancak;kñúgeBldMNalKñaCamYykMralxNÐ (cast monolithically with the slab) b¤edayFñwmEdk b¤edayssr b¤edaydI. CaTUeTAkMras;kMralxNÐman tMéltUcebIeRbobeFobCamYynwgRbEvgElVg ¬rUbTI 9>1¦.

kMralxNÐebtugenAkñgGaKarGacEbgEckdUcxageRkam³ a. kMralxNÐmYyTis (one-way slab)³ RbsinebIkMralxNÐEdlRTedayRCugBIrQmKña enaHvanwgekag b¤

dabkñúgTisedAEkgnwgRCugénTMr. GMeBIrbs;rcnasm<næ½KWmanEtmYyTis ehIybnÞúkEdlRTedaykMral xNÐenAkñúgTisedAEdldabtUc. kMralxNÐRbePTenHRtUv)aneKeGayeQ μaHfa kMralxNÐmYyTis ¬rUb TI 9>1a¦. RbsinebIkMralxNÐRtUv)anRTedayRCugbYn ehIypleFobRCugEvgelIRCugxøIFMCag b¤esμ Inwg 2 enaHbnÞúkPaKeRcIn ¬RbEhl %95 b¤eRcInCagenH¦ RtUv)anRTenAkñúgTisedAxøI ehIyGMeBImYyTis RtUv)anBicarNasMrab;karGnuvtþn_TaMgGs; ¬rUb TI 9>1b¦. RbsinebIkMralxNÐRtUv)aneFVIeLIgedayeb tugBRgwgedayEdkedayK μanrnæxül; (no void) enaHeKeGayeQμaHfa kMralxNÐmYyTistan; (one-

way solid slab) . rUb TI 9>1 c, d nig e bgðajBIbøg;BuH nigkarBRgayEdk.

b. RbBnæ½kMralxNÐrnUtmYyTis (one-way joist floor slab)³ kMralxNÐRbePTenHeKk¾eGayeQ μaHfa ribbed slab. vapSMeLIgedaykMralxNÐEdlCaTUeTAmankMras;BI mm50 eTA mm100 RTedayrnUteb tugGarem: (ribs or joist). CaTUeTArnUtmanragsþÜc nigmanKMlates μ I²KñaminelIs mm750 . rnUt RtUv)anRTedayFñwmEdlsßitenAelIssr. KMlatrvagrnUtGacbegáIt)anedaykareRbIBum<Edk b¤Bum<eFVIBI fiberglass rUbTI9>2. enAkñúgkMralxNÐrnUtxøH KMlatrvagrnUtGacRtUv)anbMeBjeday filler edIm,IeFVI eGaykMralxNÐEpñkxageRkamrabesμ I.

c. RbBnæ½kMralxNÐBIrTis (two-way floor system)³ enAeBlEdlkMralxNÐRTedayRCugbYn ehIypl eFobénRCugEvgelIRCugxøItUcCag 2 enaHkMralnwgdabedaykMeNagDubelITisedATaMgBIr. bnÞúkkMral xNÐRtUv)anbBa¢ÚnkñúgTisedABIreTAFñwmTaMgbYnEdlBTæ½CMuvijkMralxNÐ ¬eyagtamemeronTI17¦. Rb ePTepSgeTotrbs;RbBnæ½kMralxNÐBIrTisman flat plate floor, flat slab nig waffle slab EdlkMral xNÐTaMgenHnwgBnül;kñúgemeronTI17. kñúgemeronenHeyIgniyayEtBIRbBnæ½kMralxNÐmYyTis.

Department of Civil Engineering viTüasßanCatiBhubec©keTskm<úCa

One-Way Slab 174

2> karKNnaénkMralxNÐtan;mYyTis RbsinebIkMralebtugcak;kñúgkMras;es μ IedayK μanRbehag eKGacehAva)anfa kMraltan;. enAkñúgkMral

xNÐmYyTis (one-way slab) pleFobénRbEvgEvgrbs;kMralxNÐelIRbEvgsøIrbs;vaFMCag 2. bnÞúkrbs;kM ralesÞIrEtTaMgGs;RtUv)anbBa¢ÚneTATisedAxøI ehIykMralxNÐGaccat;TukdUcCaFñwm. cMerokkMralxNÐÉktþa Ca TUeTAmanRbEvg m1 RtUv)ancat;TukCaFñwmctuekaN. FñwmenHmanTTwg m1 CamYynwgkMBs;esμ InwgkMras;kMral

T.Chhay NPIC

kMralxNÐmYyTis 175

xNÐ nigRbEvgElVgesμ InwgcMgayrvagTMr. dUcenHkMralxNÐmYyTispSMeLIgedayFñwmctuekaNCaeRcInCab;²Kña ¬rUbTI9>1¦.

RbsinebIkMralxNÐmanEtmYyElVg ehIyvasßitenAelITMredayesrI enaHm:Um:g;viC¢manGtibrma M sM

rab;bnÞúkBRgayes μ I w KW 8/)( 2wLM = Edl L KWCaRbEvgElVgrvagTMr. RbsinebIkMralxNÐRtUv)ansag sg;eLIgkñúgeBldMNalKñaCamYy b¤Cab;enAelITMrCaeRcIn enaHm:Um:g;viC¢man nigGviC¢manRtUv)anKNnaedaykar viPaKeRKOgbgÁúM (structural analysis) b¤edayviFIemKuNm:Um:g; (moment coefficient) sMrab;FñwmCab;. ACI

Code, Section 8.3 GnuBaØateGayeRbInUvemKuNm:Um:g; nigemKuNkMlaMgkat;enAkñúgkrNIkMralxNÐmaneRcIn ElVgesÞIresμ IKña ¬rUbTI 9>3¦. krNIenHGaceRbI)ansMrab;ElVgBIrEdlenACab; b¤enAsgçagEvgCag ElVgEdlenA kNþal b¤ElVgCab;enaHticCag %20 . sMrab;bnÞúkBRgayes μ I bnÞúkGefrÉktþaminKYrFMCagbnÞúkefrÉktþa 3bI eT. RbsinebIlkçxNÐTaMgenHminRtUv)anbMeBjeTenaH eKRtUvkarkarviPaKeRKOgbgÁúM (structural analysis). enAkñúgkarviPaKeRKOgbgÁúM m:Um:g;Bt;GviC¢manenARtg;GkS½rbs;TMrRtUv)anKNna. tMélEdlRtUvBicarNaenAkñúg karKNnaKWm:Um:g;GviC¢manenABImuxépÞénTMr. edIm,ITTYl)antMélenH eKRtUvdktMélm:Um:g;GtibrmaenAGkS½TMr eday 3/Vb Edl V CakMlaMgkat;TTwgEdl)anBIkarviPaKeRKOgpÁúM nig b KWCaTTwgrbs;TMr.

fM ¬enABImuxépÞénTMr¦ cM= ¬enARtg;GkS½énTMr¦3

Vb− ¬(>!¦

bEnßmBIelIm:Um:g; kMlaMgTajGgát;RTUg nigRbEvgf<k;énEdk KYrEtRtUv)anepÞógpÞat;sMrab;karKNnad¾ RtwmRtUv.


One-Way Slab 176

lkçxNÐEdlemKuNm:Um:g;sMrab;FñwmCab; nigkMralCab;EdleGayenAkñúgrUbTI 9>3 KYrRtUv)aneRbIGacRtUv segçbdUcxageRkam³

a. ElVgmanRbEvgesÞIes μ IKña³ ElVgEvg 2.1≤ ¬ElVgxøI¦

b. bnÞúkRtUvBRgayesμ I c. pleFob ¬bnÞúkGefr / bnÞúkefr¦ RtUvtUcCagb¤es μInwg 3.

d. sMrab;kMralxNÐEdlmanElVgtUcCagb¤es μ I m3 m:Um:g;Bt;GviC¢manenABImuxépÞénTMres μ Inwg 2121

nulw .

e. sMrab;TMr A EdlminCab; nigmanPaBTMenr enaHemKuNm:Um:g;enARtg;cMnuc A KWes μ IsUnü nigRtg;cMnuc 111+=B

f. kMlaMgkat;TTwgenARtg;cMnuc 2/15.1 uulwC = nigenABImuxépÞTMrdéTeTotTaMgGs;esμ Inwg uulw21

g. =uM ¬emKuN¦ 2uulw / Edl =nl clear span.

3> EdnkMNt;kñúgkarKNnaEdlGnuelameTAtam ACI CODE

EdnkMNt;xageRkamRtUv)ankMNt;eday ACI Code³ a. cMerokkMralxNÐEdlmanTTwg m1 RtUv)ansnμt;.

T.Chhay NPIC

kMralxNÐmYyTis 177

b. kMras;Gb,brmaénkMralxNÐmYyTisEdleRbIEdk MPa400 Gnuelamtam ACI Code, Table 9.5a sMrab;kMralxN½Ðtan;mYyTis nigsMrab;kMralxNÐrnUtmYyTisKYresμ InwgtMéldUcxageRkam³ - sMrab;TMrsamBaØ³ kMralxNÐtan; (solid slab)/ 20/Lh = ¬kMralxNÐrnUt (ribbed slab),

16/Lh = ¦

- sMrab;kMralxNÐEdlCab;mçag³ kMralxNÐtan;/ 24/Lh = ¬kMralxNÐrnUt , 5.18/Lh = ¦

- sMrab;kMralxNÐEdlCab;sgçag³ kMralxNÐtan; / 28/Lh = ¬kMralxNÐrnUt , 21/Lh = ¦

- sMrab;kMralxNÐ cantilever: kMralxNÐtan; / 10/Lh = ¬kMralxNÐrnUt , 8/Lh = ¦

- sMrab; yf xusBI MPa400 enaHtMélTaMgGs;xagelIRtUvKuNnwg yf3105.14.0 −⋅+ Edl yf Kit Ca MPa . kMras;Gb,brmaenHRtUv)aneRbITal;EtkarKNnaPaBdabbgðajfakMras;tUcCagenHGac eRbIedayK μanplb:HBal;Rtlb;mkvij.

c. eKRtUvepÞógpÞat;PaBdabenAeBlTMrkMralxNÐEdlP¢ab;eTAnwgsMNg;TMngCargeRKaHfñak;xøaMgedayPaB dabFM. PaBdabkMNt;RtUv)ankMNt;eday ACI Code, Table 9.5b .

d. eKcUlcitþeRCIserIskMras;kMralxNÐedaytMeLIg b¤bnßymþg mm10 .

e. eKRtUvepÞógpÞat;kMlaMgkat;TTwg ebIeTaHbIvaminmantMélFMk¾eday.

f. kMras;ebtugkarBarEdk (concrete cover) enAkñúgkMralxNÐebtugminRtUvtUcCag mm20 sMrab;épÞkM ralxNÐEdlRbQmnwgkarsik b¤b:HpÞal;nwgdI. kñúgkrNIenH 2/20 bdmmhd −−= eyagtamrUbTI 9>1 d .

g. sMrab;eRKagkMralxNÐEdlmankMras;esμI enaHbrimaNEdkGb,brmaenAkñúgTisedArbs;kMralxNÐminRtUv tUcCagbrimaNEdktMrUvkarsMrab;karrYmmaD nigTb;nwgsItuNðPaB (shrinkage and temperature

reinforcement) eT (ACI Code, Section 7.12).

h. EdkemminRtUvmanKMlatFMCagkMras;kMralxNÐbIdg h3 b¤FMCag mm450 eLIy (ACI Code, Section

7.6.5).

i. eKRtUveRbIRbBnæ½EdkRtg;TaMgenAEpñkxagelI nigEpñkxageRkamrbs;kMralxNÐCab;. eBlxøHeKk¾GaceRbI RbBnæ½EdkcMruH ¬EdkRtg; nigEdkBt;¦pgEdr.

j. bEnßmBIelIEdkem eKk¾RtUvdak;EdkEdlEkgnwgEdkemEdr. EdkbEnßmenHeKehAfa Edkrg (secondary,

distribution) EdkrYmmaD b¤EdksItuNðPaB (shrinkage or temperature reinforcement).


One-Way Slab 178

4> EdksItuNðPaB nigEdkrYmmaD

CaTUeTAebtugrYmmaDenAeBlEdlTwkkMe)arsIum:g;t¾rwg ehIyeK)anKitTunCamunnUvbrimaNBitR)akdén karrYmmaD. RbsinebIkMralxNÐRtUv)aneKdak;eGaycl½tedayesrIenAelITMrrbs;va enaHvanwgrYjedIm,ITTYlnUv karrYmmaD. b:uEnþkMralxNÐ b¤Ggát;epSgeTotRtUv)anP¢ab;y:agrwgeTAnwgGgát;déTeToténeRKOgbgÁúM EdlbegáIt nUvkMriténkarTb;y:agBitR)akdenAcug. CalTæpleKTTYl)ankugRtaMgTajEdleKsÁal;faCakugRtaMgrYmmaD. karfycuHnUvkugRtMgEdlekItBIsItuNðPaB nigkugRtaMgEdlekItBIkarrYmmaD)aneFVIeGayekItmansñameRbHb:un sésrsk; (hairline crack). sésrEdkEdkdak;enAkñúgkMralxNÐKWedIm,ITb;Tl;nwgkarrYjxøI nigkarraldalén sñameRbH. edaysarEtebtugrYmmaD sésrEdkrgnUvkarsgát;.

EdksMrab;karkugRtaMgrYmmaD nigkugRtaMgsItuNðPaBEdlEkgnwgEdkem RtUvdak;enAkñúgkMralxNÐEdl EdlemRtUv)andak;EtmYyTis. ACI Code, Section 7.12.2 kMNt;nUvGRtaEdkGb,brmadUcxageRkam³

- sMrab;kMralxNÐEdleRbIEdk MPa280 b¤ MPa350 enaH %2.0=ρ - sMrab;kMralxNÐEdleRbIEdk MPa400 b¤EdkpSar b¤EdksMNaj;pSar enaH %18.0=ρ K μankrNIEdlEdkRtUv)andak;manKMlatFMCag 5dgkMras;kMralxNÐ b¤FMCag mm450 eT. sMrab;EdkrYmmaD nigEdksItuNðPaB kMras;ebtugTaMgmUl h EdlRbQmnwgkarrYmmaDRtUveRbIedIm,I

KNnaRkLaépÞEdk. ]TahrN_ RbsinebIkMralxNÐmankMras;srub mmh 150= nig MPaf y 400= enaHRk LaépÞEdkEdlRtUvkarsMrab;TTwgkMralxNÐ m1 KW 22700018.01501000 mmAs =××= . KMlatEdk S GacKNnadUcxageRkam³

s

bA

AS

1000= ¬(>@¦

Edl =bA RkLaépÞEdkeRCIserIs =sA RkLaépÞEdkKNna ]TahrN_ RbsinebIeKeRbIEdk 10DB ¬ 25.78 mmAb = ¦ enaH mmS 290270/5.781000 =×=

yk mm250 . RbsinebIeKeRCIserIsEdk 12DB ¬ 2113mmAb = ¦ enaH mmS 418270/1131000 =×= yk mm400 . EdkenHmantYrnaTICaEdkrgEdlRtUv)andak;EkgnwgEdkemEdlRtUv)anKNnaedaykarviPaK edaykarBt; (flexural analysis).

5> lMGitsésrEdk enAkñúgkMralxNÐmYyTisCab; RkLaépÞEdkemRtUv)anKNnaBIRKb;eRKaHfñak;TaMgGs; TaMgenAkNþalElVg

nigenATMr. kareRCIserIssésrEdk niglMGitsésrEdkGaRs½yeTAnwgRkLaépÞEdk KMlatRtUvkar nigRbEvg TMBk;. eKmanRbBnæ½rayEdkBIrRbePT.

T.Chhay NPIC

kMralxNÐmYyTis 179

enAkñúgRbBnæ½EdkRtg; ¬rUbTI9>4¦ EdkRtg;RtUv)aneRbIsMrab;dak;enAEpñkxagelI nigEpñkxageRkaménRKb;kM ralxNÐTaMgGs;. karcMNayelIfvikar nigeBlevlasMrab;pltiEdkRtg; RtUvkarticCagkñúgkarplitEdkBt; dUcenHRbBnæ½EdkRtg;RtUv)anTUlMTUlayCagenAkñúgsMNg;.

enAkñúgRbBnæ½EdkBt; b¤ trussed EdkRtg; nigEdkBt;RtUv)andak;qøas;KñaenAkñgkMralxNÐ. TItaMgBt; RtUv)anepÞógpÞat;sMrab;karBt; kMlaMgkat;TTwg nigtMrUvkarRbEvgf<k;. sMrab;bnÞúkFmμtaenAkñúgsMNg; bøg;lMGit sésrEdksMrab;ElVgxag nigElVgkNþalénkMralxNÐtan;mYyTisRtUv)anbgðajenAkñúgrUbTI 9>4.

6> karEbgEckbnÞúkBIkMralxNÐmYyTiseTAFñwmTMr enAkñúgRbBnæ½kMralxNÐmYyTis bnÞúkBIkMralxNÐRtUv)anbBa¢ÚneTAFñwmTMrtamcugEvgénkMralxNÐ. Fñwm

bBa¢ÚnbnÞúkrbs;vaeTAssrTMr. BIrUbTI 9>5 eyIgeXIjfa Fñwm 2B RTbnÞúkBIkMralxNÐEk,rBIr. edaycat;TukCaFñwmRbEvg m1 bnÞúkbBa¢Ún

eTAFñwmesμ InwgRkLaépÞéncMerokTTwg m1 nigbeNþay S KuNnwgGaMgtg;sIuetbnÞúkEdlmanGMeBIelIkMralxNÐ. bnÞúkenHbegáItCabnÞúkBRgayes μ IenAelIFñwm

SUU SB ⋅=


One-Way Slab 180

bnÞúkBRgayes μ IenAelIFñwmxag 1B esμ InwgBak;kNþalbnÞúkenAelIFñwm 2B edaysarEtvaRTkMralxNÐEtmçag. bnÞúkenAelIssr 4C esμ InwgRbtikmμBIFñwm 2B Ek,rBIr bnÞúkenAelIssr LSULUC SB ==4 bnÞúkenAelIssr 3C esμ InwgBak;kNþalbnÞúkenAelIssr 4C edaysarEtvaRTkMralxNÐEtmçag. dUcKñacM

eBaHbnÞúkenAelIssr 2C nig 1C KW³ bnÞúkenAelIssr == SLUC S 22 bnÞúkenAelIssr 3C bnÞúkenAelIssr

221SLUC S=

BIkarviPaKenH eyIgeXIjfassrnImYy²RTbnÞúkBIkMralxNÐEdlenACMuvijssrenaH edayKitrhUtdl;GkS½ énkMralxNÐEk,r ¬ 2/L sMrab;TisEvg nig 2/S sMrab;TisxøI¦.

karBRgaybnÞúkBIkMralxNÐBIrTiseTAFñwmTMr nigssrnwgBnül;enAkñúgemeronTI17.

T.Chhay NPIC

kMralxNÐmYyTis 181

]TahrN_TI1³ KNnaersIusþg;m:Um:g;KNnarbs;kMralxNÐEdlmankMBs;srub mmh 175= nigBRgwgedayEdk 20DB EdlmanKMlat mmS 175= . eRbI MPaf c 20' = nig MPaf y 400= .

dMeNaHRsay³ 1> KNnakMBs;RbsiTæPaB d ³

220 bd

mmhd −−= ¬emIlrUb9>1 d¦ mmmmd 145

22020175 =−−=

2> KNna sA mFümEdlpþl;sMrab;TTwgkMralxNÐ m1 . RkLaépÞénEdk 20DB KW 2314mmAb = mmmAs /1794

1753141000 2=

×=

3> eRbobeFobPaKryEdkEdleRbICamYynwg maxρ nig minρ . sMrab; MPaf c 20' = nig MPaf y 400= enaH 01374.0max =ρ nig 00333.0min =ρ .

ρ ¬eRbIR)as;¦ 0128.0)1401000/(1794 =×= EdlRKb;RKan; ¬ 9.0=φ ¦. 4> KNna )2/( adfAM ysn −= φφ

mmbffAa cys 2.42)10002085.0/(4001794)'85.0/( =×××== ( ) mkNM n .79.762/2.4214040017949.0 =−×××=φ

]TahrN_TI2³ kMNt;bnÞúkGefrBRgayesμ IGnuBaØatEdlGacGnuvtþenAelIkMralxNÐén]TahrN_TI1 RbsinebI ElVgkMralxNÐmanRbEvg m9.4 sßitenAcenøaHTMrsamBaØ nigRTnUvbnÞúkefrBRgayes μ I ¬K μanbBa©ÚlbnÞúkpÞal;xøÜn¦

2/8.4 mkN . dMeNaHRsay³

1> ersIusþg;m:Um:g;KNnaénkMralxNÐKW mkN.79.76 elIkMralxNÐTTwg m1

8)9.4(

879.76

22uu

nuWLW

MM ==== φ bnÞúkBRgayes μ IemKuNKW 2/6.25 mkNWu =

2> LDWu 6.12.1 += 2/2.9251175.08.4 mkND =××+=

2/1.9 mkNL = ]TahrN_TI3³ KNnakMralxNÐTMrsamBaØRbEvg m6.3 edIm,IRTbnÞúkefrBRgayes μ I ¬minrab;bBa©ÚlbnÞúkpÞal; xøÜn¦ 2/75.5 mkN nigbnÞúkGefrBRgayes μ I 2/8.4 mkN . eRbI MPaf c 20' = / MPaf y 400= nigkar kMNt;rbs; ACI Code. dMeNaHRsay³


One-Way Slab 182

1> sn μt;kMras;kMralxNÐ. sMrab; MPaf y 400= kMras;Gb,brmaedIm,IRKb;RKgPaBdabKW 20/L mm180= . sn μt;kMrs;srub mmh 175= nigsnμt; mmd 150= ¬RtUvepÞógpÞat;enAeBleRkay¦.

2> KNnabnÞúkemKuN³ bnÞúkkMralxNÐ 2/4.425175.0 mkN=×= 2/86.198.46.1)75.54.4(2.16.12.1 mkNLDWu =×++×=+=

sMrab;kMralxNÐTTwg m1 / 8/2LWM uu = mkNM u .2.32

86.386.19 2

=×

= 3> KNna sA ³ sMrab; mkNM u .2.32= / mb 1= nig md 15.0= / MPabdMR uu 43.1/ 2 == /

01374.00042.0 max =<= ρρ / 9.0=φ . 263015010000042.0 mmbdAs =××== ρ

eRCIserIsEdk 12DB ¬ 2113mmAs = ¦/ nig mmS 179630/1131000 =×= epÞógpÞat; d BitR)akd/ mmd 149620175 =−−= GacTTYlyk)an. dUcenH mmS 175= nig 2645mmAs =

4> epÞógpÞat;ersIusþg;m:Um:g;énmuxkat;cugeRkay mm

bffA

ac

ys 2.1510002085.0

400645'85.0

=××

×==

mkNMmkNadfAM uysn .2.32.332

2.151504006459.02

=>=⎟⎠⎞

⎜⎝⎛ −××=⎟

⎠⎞

⎜⎝⎛ −= φφ

5> KNnaEdkrgEdlEkgnwgEdkem. sMrab; MPaf y 400= 0018.0min =ρ

231517510000018.0 mmAsh =××= eRCIserIsEdk 12DB / 2113mmAb = / mmS 7.358315/1131000 =×= dUcenHeRbI mmDB 350@12 sMeab;Edkrg.

6> epÞógpÞat;kMlaMgkat;TTwgcaM)ac;³ uV enAcMgay d BITMrKW kN8.32)15.08.1(86.19 =− kNbdfV cc 5.851015010002017.075.0'17.0 3 =××××== −φφ

kNVkNV uc 8.3275.4221

=>=φ dUcenHmuxkat;RKb;RKan;. 7> muxkat;cugeRkay mmh 175= / Edkem mmDB 175@12 nigEdkrg mmDB 350@12 .

]TahrN_TI4³ muxkat;kMralxNÐtan;mYyTisCab;RtUv)anbgðajkñúgrUbTI 9>6. kMralxNÐenHRTedayFñwmEdl manRbEvg m2.7 . bnÞúkGefrmanGMeBIelIkMralxNÐ)anmkBIbnÞúkpÞal;xøÜnbUknwg 2/7.3 mkN ehIybnÞúkGefrKW

T.Chhay NPIC

kMralxNÐmYyTis 183

2/2.6 mkN cenøaHTMrsamBaØ. KNnakMralxNÐCab; nigKUrnUvbøg;lMGitsésrEdk. eKeGay MPaf c 20' = / MPaf y 280= .

dMeNaHRsay³

1> kMras;Gb,brmaénkMralxNÐTI1KW 30/L edaysarcugmçagCab; nigcugmçageTotGt;Cab;. cMgayrvagGkS½FñwmGaccat;TukCaElVg mL 6.3= . sMrab; MPaf y 280= kMras;srubGb,brma mmL 120

303600

30==

kMras;srubGb,brmasMrab;ElVgkNþal mmL 10335

360035

== sn μt;kMras;rbs;kMralxNÐesμ IKñaRKb;ElVg mmh 125= EdlFMCag mm120 . dUcenH eKmincaM)ac;epÞóg pÞat;PaBdab.

2> KNnabnÞúk nigm:Um:g;enAelIcMerokÉktþa bnÞúkGefr=bnÞúkpÞal;xøÜn 7.3+ = 2/8.67.325125.0 mkN=+× bnÞúkemKuN 2/1.182.66.18.62.16.12.1 mkNLDU =×+×=+= RbEvg clear span KW m35.3 . m:Um:g;caM)ac;sMrab;ElVgTImYyenAelITMrEdlmanElVgCab;esI μnwg

10/2UL ( ) mkNUM u .3.20

1035.3 2

== 3> sn μt; %4.1=ρ enaH MPaRu 12.3= tMélenHtUcCag 0169.0max =ρ nigFMCag 005.0min =ρ

¬ 9.0=φ ¦

mmbR

Md

u

u 81100012.3103.20 6

=×⋅

== 21134811000014.0 mmbdAs =××== ρ

eRCIserIs 16DB kMras;srub mmd 10920

216

=++= eRbIkMras;kMralxNÐ mm125 dUckarsnμt;xagelI kMBs; d EdleRbIBitR)akd mm97820125 =−−=

4> m:Um:g; nigsésrEdkRtUvkarenARtg;muxkat;déTeTot edayeRbI mmd 97= mandUcxageRkam³ TItaMg emKuNm:Um:g; uM ).( mkN 2/ bdMR uu = )(MPa ρ (%) sA )( 2mm Edk nigKMlat

A 241− 8.46 tUc 0.00500 485 DB12@200


One-Way Slab 184

B 141+ 14.51 1.54 0.00646 627 DB16@300

C 101− 20.31 2.16 0.00928 900 DB16@200

D 111− 18.47 1.96 0.00836 811 DB16@200

E 161+ 12.70 1.35 0.00561 545 DB16@200

karBRgaysésrEdkRtUv)anbgðajenAkñúgrUbTI 9>7. 5> kMlaMgkat;TTwgekItmanenAkMralxNÐxageRkAénTMrTI2/ muxkat; C 6> uV ¬Rtg; C ¦ kNULn 95.36

255.31.1815.12/15.1 =

××==

7> 3.55109710002017.075.0'17.0 3 =××××== bdfV cc φφ lTæplenHGacTTYlyk)an. cMNaMfa kardak;sésrEdkkMlaMgkat;TTwgGb,brmaenAeBlEdl cu VV φ2

1> minRtUv)anGnuvtþsMrab;kMralxNÐeT ¬ ACI Code, Section 11.5.5¦.

]TahrN_TI5³ kMNt;bnÞúkemKuNBRgayes μ IenAelIFñwmkNþalEdlRTkMralxNÐén]TahrN_TI 4. dUcKña KNnabnÞúkcMGkS½enAelIssrkNþal eyagtambøg;TUeTAénrUbTI9>5. dMeNaHRsay³

1> bnÞúkemKuNBRgayes μ IkñúgmYyEm:RtRbEvgenAelIFñwmkNþales μInwgbnÞúkemKuNBRgayes μ IenAlIkMral xNÐKuNnwg S EdlCaRCugxIørbs;kMralxNÐ. dUcenH

U ¬Fñwm¦=U ¬kMralxNÐ¦ S× = mkN /8.688.31.18 =× bnÞúkrbs;FñwmKYrRtUv)anKitbBa©Úl. RbEvgrbs;FñwmKW m2.7 kMNt;kMBs;srub mLh 288.08.0

202.78.0

20=×=×= yk mm300

kMras;kMralxNÐKW mm125 dUcenHkMBs;énRTnugrbs;FñwmKW mm175125300 =− bnÞúkemKuNénRTnugFñwm mkN /3.12.12525.0175.0 =×××= bnÞúkBRgayes μ IsrubelIFñwm mkN /1.703.18.68 =+=

T.Chhay NPIC

kMralxNÐmYyTis 185

2> bnÞúkenAleIFñwmkNþal mkNPu /72.5042.71.70 =×=

7> RbBnæ½kMralxNÐrnUtmYyTis One-Way joist Floor System RbBnæ½kMralxNÐrnUtmYyTispSMeLIgedaykMralxNÐRbehag (hollow slab) CamYykMBs;srubFMCagkMras;

rbs;kMralxNÐtan;mYyTis. kMralxNÐenHmanlkçN³snSMsMécsMrab;GKarEdlmanbnÞúktUc nigmanElVgEvg dUcCa salaeron mnÞIreBTü nigsNæaKar. bnÞúkenAkñúgtMbn;TajK μan\TæiBldUcenH tMbn;enHRtUv)anTukeGayRb ehagrvagrnUt b¤RtUv)anbMeBjCamYysMPar³EdlmanTMgn;Rsal edIm,Ikat;bnßyTMgn;pÞal;rbs;kMralxNÐ.

viFIsaRsþkñúgkarKNna nigtMrUvkarénkMralxNÐrnUt (ribbed slab) GnuvtþdUckarKNnaFñwmmuxkat;ctu ekaN nigFñwmmuxkat;GkSret EdlmanenAkñúgemeronTI3. cMnucxageRkamRtUv)anGnuvtþsMrab;KNnakMralxNÐ rnUtmYyTis.

1 rnUt (rib) manragsþÜcxageRkam nigmanKMlatdUc²KñaRbEhl mm400 eTA mm750 . Rbehag RtUv)anbegáItrUbragedayeRbIBum<EdlmanTTwg mm500 nigCMerA mm150 eTA mm500 GaRs½y eTAelItMrUvkarénkarKNna. kMeNInbTdæanrbs;kMBs;KWmþg mm50 .

2 rnUtminRtUvmanTTwgtUcCag mm100 nigminRtUvmanCMerAFMCagTTwg 5.3 dg. KMlat clear spacing rvagrnUtminRtUvFMCag mm750 (ACI Code, Section 8.11).

3 ersIusþg;kMlaMgkat;TTwgEdlpþl;edayebtugsMrab;rnUtGacykesμ Inwg %10 FMCagersIusþg;kMlaMg kat;TTwgEdlpþl;edayebtugsMrab;Fñwm. mUlehtucMbgKWbNþalmkBIGnþrkm μrvagkMralxNÐ nig rnUtEdlmanKMlatCit²Kña (ACI Code, Section 8.11.8).

4 CaTUeTAkMralxNÐenABIelIrnUtmankMras;BI mm50 eTA mm100 nigmanEdkGb,brma ¬EdkrYm maD¦. kMras;enHminRtUvtUcCag 12/1 én clear span rvagrnUt b¤ mm50 (ACI Code, Section

8.11.6). 5 emKuN ACI sMrab;KNnam:Um:g;enAkñúgkMralxNÐCab; GacRtUv)aneRbIsMrab;KNnakMralxNÐrnUt

Cab;. 6 eKmanEdnkMNt;bEnßmmYycMnYn EdlRtUv)ansegçbdUcxageRkam³

- TTwgGb,brmarbs;rnUtKW mYyPaKbIénkMBs;srub b¤ mm100 edayykmYyNaEdlFMCag. - EdkrgenAkñúgkMralxNÐenAkñúgTisedAEkgnwgrnUtminKYrtUcCagbrimaNEdkrYmmaD b¤tUcCag

5/1 énRkLaépÞEdkemenAkñúgrnUt.


One-Way Slab 186

- EdkrgEdlRsbnwgrnUtKYrdak;enAkñúgkMralxNÐ ehIyKMlatrbs;vaminRtUvmancMgayFMCagBak; kNþalénKMlatrvagrnUt.

- RbsinebIbnÞúkGefrenAelIkMralxNÐrnUttUcCag 2/3 mkN ehIyRbEvgrbs;rnUtFMCag m5 enaH rnUtTTwgrg (secondary transverse rib) RtUv)andak;enAkNþalElVg ¬TisedArbs;vaKWEkgnwg TisedArbs;rnUtem¦ nigBRgwgedayEdkEdlmanbrimaNesμ InwgbrimaNEdkenAkñúgrnUtem. EdkxagelIrbs;vaminRtUvtUcCagBak;kNþalEdkemenAkñúgtMbn;Taj. rnUtrgmannaTIBRgwgkM ralxNÐ (floor stiffener) .

- RbsinebIbnÞúkGefrFMCag 2/3 mkN ehIyrnUtemmanRbEvgERbRbYlcenøaHBI m4 eTA m7 eK RtUvdak;rnUtrgmYydUcbgðajxagelI. RbsinebIrnUtemmanRbEvgFMCag m7 y:agehacNas; rnUtrgBIrRtUv)andak;CamYynwgsésrEdkdUckarENnaMxagelI.

]TahrN_TI6³ kMNt;kMralxNÐrnUtmYyTisenAxagkñúgCamYynwgTinñn½yxageRkam³ RbEvgrnUt m6 ¬TMr samBaØ¦/ bnÞúkefr ¬edaymin)anbBa©ÚlbnÞúkpÞal;¦ 2/75.0 mkN / bnÞúkGefr 2/1.4 mkN / MPaf c 28' = nig MPaf y 400= . dMeNaHRsay³

1> KNnakMralxNÐ³ snμt;kMras;kMralxNÐxagelIesμ Inwg mm50 EdlP¢ab;CamYynwgrnUtEdlman clear

span mm500 . sMPar³edIm,IbMeBj (filler) minRtUv)aneRbI. bnÞúkpÞal;rbs;kMralxNÐKW 25050.0 × 2/25.1 mkN= .

bnÞúkefrsrub 2/.275.025.1 mkND =+= 2/91.46.122.16.12.1 mkNLDU =×+×=+=

12

2ULM u = ¬kMralxNÐRtUv)ancak;Cab;CamYynwgrnUt¦

mkNM u .19.012

5.09 2=

×=

edaycat;Tukm:Um:g;enAkñúgkMralxNÐRtUvRTedayebtugsuTæ enaHersIusþg;TajedaykarBt;GnuBaØatrbs;ebtugKW ct ff '415.0= CamYynwgemKuNkat;bnßyersIu sþg; 55.0=φ / MPaft 2.228415.0 == . ersIusþg;TajrgkarBt; tfI

Mc φ== 46

331042.10

12501000

12mmbhI ⋅=

×==

mmhc 252==

T.Chhay NPIC

kMralxNÐmYyTis 187

mkNMmkNcIfM ut .19.0.5.010

251042.102.255.0 6

6=>=⋅

⋅××== −φ ¬muxkat;RKb;RKan;¦

EdkrYmmaD 2905010000018.0 mmAs =××=

Edk 10DB manKMlat mm300 RtUv)andak;EkgnwgTisedArbs;rnUt. sMNaj;EdkpSar (welded

wire fabric) manlkçN³snSMsMécsMrab;krNIbrimaNEdktic. eRbIEdk 10DB manKMlat mm300 sMrab;dak;RsbnwgTisedArnUt edayEdkmYyedImRtUv)andak;enABI elIrnUtnImYy² nigEdkmYyeTotRtUv)andak;enAcenøaHkNþalrnUtBIr.

2> KNnam:Um:g;enAkñúgrnYt kMBs;Gb,brma mL 3.0

206

20===

kMBs;srubrbs;rnUtnigkMralxNÐKW mm30050250 =+ sn μt;TTwgrnUtEpñkxageRkamKW mm100 nigEpñkxagelI ¬nIv:U)atkMralxNÐ¦KW mm150 rUbTI9>8. TTwgmFümrbs;rnUtKW mm125 cMNaMfa kMeNInénTTwgrbs;rnUtedayeRbIBum<cl½tEdlmanpleFob 12/1 ¬edk 1 nigQr 12¦ TMgn;rnUt= mkN /78.02525.0125.0 =×× rnUtRTnUvbnÞúkmkBIkMralxNÐEdlmanTTwg mm600 bUknwgbnÞúkpÞal;rbs;va

mkNU /35.678.02.16.09 =×+×= mkNULM u .6.28

8635.6

8

22=

×==

3> KNnarnUt³ kMBs;srubrbs;rnUtKW mm300 . sn μt;eRbIEdk 16DB nigkMras;ebtugkarBarEdk mm20 kMBs;RbsiTæPaB mmd 272820300 =−−= BinitüemIlersIusþg;énsøab ¬sn μt;muxkat; tension-controlled section/ 9.0=φ ¦

nMφ ¬søab¦ ⎟⎠⎞

⎜⎝⎛ −=

2tdCφ Edl btfC c'85.0=

( ) mkNM u .7.158102

50272506002885.09.0 6 =⋅⎟⎠⎞

⎜⎝⎛ −×××= −

ersIusþg;m:Um:g;ebs;søabFMCagm:Um:g;Gnuvtþn_ dUcenHrnUtmannaTICamuxkat;ctuekaNEkgEdlmanTTwg mmb 600= nigkMBs;énbøúkrgkarsgát;smmUl a KWtUcCagkMras;kMralxNÐ mm50 .

)'7.1

(2 bf

fAdfAadfAM

c

ysysysn −=⎟

⎠⎞

⎜⎝⎛ −= φφφ

⎟⎠

⎞⎜⎝

⎛××

×−×=⋅

600287.1400

2724009.0106.28 6 ss

AA


One-Way Slab 188

2297mmAs = mmmma 5032.8

6002885.0400297

<=××

×=

eRbIEdk 162DB sMrab;rnUtmYy ( )2402mm 22

min 2972.1122721250033.00033.0 mmmmdbA ws <=××== BinitüemIl

019.0018.0272600

297max =<=

×= ρρ

EdlCamuxkat; tension-controlled section/ 9.0=φ . 4> KNnakMlaMgkat;TTwgenAkñúgrnUt³ ersIusþg;kMlaMgkat;TTwgGnuBaØaténRTnugrnUtKW

kNdbfV wcc 2.25102721252817.01.175.0'17.0)1.1( 3 =××××××=×= −φφ kMlaMgkat;TTwgemKuNenAcMgay d BITMrKW

( ) kNVkNV cu 2.253.17272.0335.6 =<=−×= φ dUcenHEdkkgGb,brmaRtUv)aneRbI ehIykrNIenHEdk 12DB RtUv)anbEnßmenAkñúgkMralxNÐEpñkxag elIedIm,ITb;Edkkg. vaCakarRbesIreBsinebIeKbEnßmrnUtrgmYyenAkNþalElVgEkgnwgrnUtem ehIy manbrimaNEdkdUcKñanwgrnUtem edIm,IeFVIeGaykMralxNÐmanlkçN³rwgmaM.

បេតុងពង្រឹងដោយដែក 9 ix-one-way-slab

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