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Slide 1
Etched01 Title Slide
GVHD: TS H Hu Chnh
Thc hin: Phm Minh Tm (02108493)
Thit k kt cu BTCT s dng mhnh Strut-and-tie theo
ACI -318-08
Bo co chuyn
LP CAO HC XD DD&CN 2008
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Slide 2
t v n
Thit k kt cu b tng ct thp theo m hnh Strutand tie (Strut and tie model -STM) c ACI gii
thiu ln u b tiu chunACI 318-02 thit k
nhngvng caktcuBTCT chutrngthi ngsut
phctp(vng D).
Tkhi ra iSTM l cng c tuytvigip ngik
sthitkktcub tng nhngvng m githuyt
mt ct phng (gi thuyt Bernolli-Euler) khng cn
ngdo tnh phi tuyncaquan h-. Nhvy,hiu,nmbtv thitkKC theo STM l yu
cut ra ivimingiksthitkktcuBTCT
hinnay.
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Slide 3
Ni dung trnh by
Thit k dm chuyn bc (stepped beam) theo mhnh STM (trn cs bi tp 8.1)
Mt s th d khc thit k vng D s dng STM.
Gii thiu vn tt bi bo kh hay ng trn ACIstructural Journal (s Sep-Oct 2008) ca GS DanielA.Kuchma v mt s phn tch kt qu thc nghimkim tra mt s vng D phc tp thit k bng
ACI STM vi nhiu m hnh dn khc nhau. Mt s kt lun ng quan tm ca tc gi bi bo.
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Slide 4
Nhc li mt s khi nim Vng D: Vng KC c s
khng lin tc trong phn bngsut, thngcc v trc s thay ivkch thchnh hccaktcuhay vtr chu ti tp trung (lc tp
trung hay phn lc gi ta).Nguyn l Saint-venant l cs xc nh vng D caktcu.
STM c xy dng trn cs gi thuyt kt cu BTCT do chu ng x theocch mong mun ca ngithitk(Theo GS Kuchma).
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Slide 5
Mt s vng D theo ACI 318-08
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Slide 6
Vng KC tnh theo STM
Theo ACI 318-08: Dmcao (deep beam) c v khng khot l. Vai ct(corbel)
Nt khung Vng tptrung ngsutuneo KC BTDUL Vch cngc l
icc
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Slide 7
Tm tt quy trnh thit k STM
C lp vng D, tnh ton lc tc dngtrn bin (s dng PTCB).
V dn o truyn lc, dng phn tch
nhi, d onnt.Cn bng lc tnh ni lc dn, kim tra
chiu rng thanh chng, k neo ct
thp.Thit k ct thp thanh ging, kim tra
ng sut BT trong thanh chng v ti
nt.
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Slide 8
V d 1: Stepped beam
Thitkv btr ctthp theo phngphp Strut-and-Tiecho ondmBTCT chuynbc (stepped beam) c ccthng ssau: Kch thcdm: b = 15 inch, h = 22 inch, d = 20 inch Mmen un: M = 4000 kip.in
Cngvtliu: fy= 40 ksi (thp), fc= 4 ksi(btng)
A
A
A
A
A-A
h
b
M
M
h
h
hhhhh
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Slide 9
B1: Tnh ton vng B
Bc1: Thit k vng B chu unGi s b tr 2 lp thp (2x3#9)
Chiu cao hu hiu:
d=22-1.5-3/8-9/8-1.25/2=18.375
Chn b tr 8#9,As= 8 in2
'
2
5.21 404.09
0.85 . 0.85 4 15
0.9 ( / 2) 4000 0.9 40( / 2)
40006.8
0.9 40 (18.375 4.09 / 2)
s y
c
u n s y s
s
A f xa in
f b x x
M M A f d a A d a
A inx x
2003 B D f lt!
Slid 10
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Slide 10
B2: Thit lp STM (dng CAST)
2003 B D f lt!
Slid 11
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Slide 11
B3: Tnh ton ni lc (CAST)
2003 B D f lt!
Slid 12
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Slide 12
B4: Thit k S,T,N (M=4000)
2003 B D f lt!
Slid 13
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Slide 13
Thit k S,T,N (M=3600)
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Slide 14
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Slide 14
B tr ct thp (M=4000)
2
2x4#91B
2#7
2#64
2x4#8
2#6
3#3@2"
3
5
1A
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Slide 15
KT QU MT S TH NGHIM KIM NH
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Slide 15KT QU MT S TH NGHIM KIM NHM HNH STM I VI VNG D PHC TP
Gio sDan iel A . Kuchma v cc cngstrngUn ivers ity of IIL INOIS at Urbara Champaign tinhnh nhiuthnghimtrn 11m hnh KC khc nhau kimchngvicpdng
ph
ng php STMi
vi
1s
vng Drt
phctp. Bngvicsdngnhiukhung g in okhc nhau ivimim hnh thnghim,thitkdatrn ACI STM, tc girt ra nhiuktlunquan trngivivicsdngSTM trong thit
k. Cc thnghimc thchintnm 2004, 2005,2006 l 1 phncachng trnh otosau ihccatrngUniversity o f IIL INOIS at Urbara
Champaign
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Slide 16
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Slide 16
t v n
STM c xy dng trn c s gi thuyt kt cu BTCT dochungxtheo cch mong muncangithitk.Thc t, STM v mt s mc lin quan khc ca b tiuchunACI 318 ckimchngtrn csphn tch thc
nghim kt cu, tuy nhin thng ch vi 1 vi phn t dn,chnghnnhngktquth nghimiviktcudmcao.Bi bo ny trnh by ktquca3 nhm th nghimtrn mtsvng Dphctphn, mivng cthitkvinhium hnh dn khc nhau sdngnhiuphntdn (m hnhc n 37 phn t dn). i chiu kt qu phn tch thcnghimcho thyvicthitkSTM theo ACI 318-02 scho ktquthin van ton.iuny khngnhuimcavicpdngSTM iviktcuchutitrngdchvv khnngpdngSTM thitkcc vng D phctpkhc.
Nidung bi bo
2003 By Default!
Slide 17 SO S NH KT QU ACI STM
http://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/Experimental_Validation_of_Strut-and-Tie_Method_for_Complex_Regions.pdf8/12/2019 Strut and Tie Model 2003
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Slide 17 SO S NH KT QU ACI STMVI KQ TH NGHIM
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Slide 18
K T LUN
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Slide 18
K T LUN
Kt qu nghin cu ch ra rng: Kh nng chu ti ca thanh dn o c tnh theo ACI STM l
thin v an ton trong c 11 kt cu th nghim ngay c khi tcgi c tnh chn a vo mt s kt cu gin khng tt.
Ni chung cc thanh gin c mt ngng qa do. iu nych ra rng kt cu khng ng x nh gin do l tng, l githuyt cn bn tnh ton kh nng khng gii hn ca gino.
ng quan h lc-chuyn v do ti dch v c th b nhhng ng k bi hnh dng ca gin o c chn
Chn s gin o khng tt c th dn n vt nt pht trinngoi vng chp nhn c v KC b ph hy di ti dch v. cng ca thanh ging c th c phn on tt bng m
hnh gin o. cng ca thanh chng cng c th c phn on tt bng
m hnh gin o khi thanh chng c chiu rng ln nht choh v c t s UR cao
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