Strut and Tie Model 2003

8/12/2019 Strut and Tie Model 2003

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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.pdf


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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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Strut and Tie Model 2003