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7/30/2019 Chuong3b-Vd Tinh Toan Khung
1/19
V d tnh ton h khung phng
Nguyn Thc V Khoa Xy dng DD&CN Trang 1/19
V D TNH TON H KHUNG PHNG
1. S tnh:
- Cho h khung phng nh hnh v, tn cc nt c k hiu bng cc ch s t 122;
tn cc phn t thanh c k hiu bng cc ch s trong du ngoc n ( ) t 130, trong
c 16 phn t ct (116) v 14 phn t dm (1730).
- Kch thc hc cho trn hnh v vi n vmm. Thanh c tit din hnh ch nht,
kch thc b rng x chiu cao c cho trong du ngoc vung [ ], vi n vmm.
- Vt liu xy dng khung l b tng ct thp, cp bn B20.
S KHUNG
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2. S ti trng:
- Ti trng tc ng vo khung c phn tch thnh 5 trng hp ti trng, gm: Tnh
ti, Hot ti 1, Hot ti 2, Gi tri v Gi phi. Vic xc nh gi tr cc ti trng khng cp
trong bi vit ny, tuy nhin s liu tnh ton trong v dc ly t vic thit k mt kt cu
thc t.
- n v ca lc tp trung l kN, lc phn bu l kN/m.
S TNH TI
7/30/2019 Chuong3b-Vd Tinh Toan Khung
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Nguyn Thc V Khoa Xy dng DD&CN Trang 3/19
S HOT TI 1 S HOT TI 2
S GI TRI S GI PHI
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3. Xc nh ni lc bng phn mm Sap2000 v14:
3.1. Lp s tnh:
- Chn n vkN-m-C
- To h kt cu mi v h li trc: FileNew
Model Grid Only: Khai bo s ng li theo
phngX = 6, Y = 1,Z = 5; khong cch liX = 0.7,
Z = 3.6OK.
- li 1 ca s XZ trn mn hnh: Options
Windows One v chn biu tng XZ trn thanh
cng c (Toolbar)
- iu chnh kch thc cc li: kch chut phi vo mn hnh chn Edit Grid
Data Modify/Show System Chn mc Spacing v sa khong cch cc trc theo ng
kch thc yu cu ca hOKOK.
- V cc phn t thanh: dng biu tng v nhanh , v ct ca tng trc (t trc B
trc E), sau v dm ca tng tng (t tng 2 tng mi)
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Tng tvcc phn tct trc C, D, E. Sau vcc phn tdm tng 2, 3, 4 v mi
Kt quc s h nh sau:
Nhn phm F7 khng th hin cc ng li trn mn hnh v vo menu View
Show Axes khng th hin k hiu h trc ta trn mn hnh
Ko chut bao quanh cc ng
li trc B s vc 4 phn t
c t ca tr c B
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- t cc lin kt gi vo khung: chn 4 nt chn
khung, vo menu AssignJointRestraint (hoc
dng biu tng ) chn lin kt ngmOK
- Xong bc 3.1 mn hnh hin th s khung nh sau:
Mun th hin tn nt v tn phn t trn s: View Set Display Option, chnLabel ti v tr Joint v Frame.
Nhn xt: vi vic vcc phn tct theo tng trc, tn ca cc phn tct sc
nh stdi ln trn, ht trc ny n trc khc. Cc phn tdm c vsau nn sc
nh s tip theo sau phn tct, theo th t t tri sang phi, ht dm tng ny n dm
tng khc.3.2 Khai bo (Define) cc thng s v vt liu, tit din
3.2.1. Vt liu:
DefineMaterial chn 4000psi
Modify/Show Material: Nhp cc
thng s ca vt liu: tn vt liu, trng
lng ring, modul n hi.OKOK.
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3.2.2 Tit din:
Define Section Property Frame Section chn Add New Property, chuyn
mn hnh hin th cc hnh dng tit din ca kt cu thp (Steel) sang hin th hnh dng tit
din ca kt cu b tng (Concrete)
Chn hnh dng tit din ch
nht, nhp cc thng s v tn tit
din, chiu cao, chiu rng OK.
Thot ra li mn hnh Frame
Property.
Cc tit din sau tng t nh
tit din khai bo nn khaibo nhanh, chn tit din va c
khai bo (VD: tit din
D200x350) v chn lnh Add Copy
of Property v khai bo cc thng
s cho tit din mi. Tng t nh
vy, khai bo tng cng 7 loi tit
din: D200x350, D200x500,
D200x550, C200x250, C200x300,C200x350 v C200x400
3.2.3. Cc trng hp ti trng:
Trong h khung cho c tng cng 5 trng hp ti trng, do trong qu trnh xc nh
ti trng ca trng hp tnh ti tc ng vo h khung xt n trng lng bn thn ca
dm (thnh lc phn b vo dm) v trng lng bn thn ca ct (thnh lc tp trung vo nt)
nn bc ny cn khai bo h s trng lng bn thn ca trng hp tnh ti bng 0.
DefineLoad Pattern Nhp tn trng hp tnh ti (VD: 1. TT), sa h s trng
lng bn thn t1 thnh 0 chn Modify Load Pattern
Nhp tn cc trng hp ti trng (VD: 2. HT1; 3. HT2; 4. GT; 5. GP) chn Add
New Load Pattern (thc hin vi 4 trng hp ti trng cn li). Kt quc nh sau:
7/30/2019 Chuong3b-Vd Tinh Toan Khung
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Nguyn Thc V Khoa Xy dng DD&CN Trang 8/19
Chn OK thot v mn hnh chnh.
D ta thay i tn ca trng hp ti trng mc nh trong Sap2000 tDEAD thnh
1. TT nhng khi xut kt qu, Sap2000 vn ly tn l DEAD, v tn ca cc trng hp ti
trng trong cc bng kt quc ly theo tn Load Case (khng phi Load Pattern), do
cn thay i tn ca Load Case cho ph hp. Define Load Case chn DEAD
Modify/Show Load Case sa li tn tDEAD thnh 1. TTOK.
Ngoi ra trong h cn c 1 trng hp Load Case mc nh khc l Modal (dng
tnh dao ng ca h), i vi kt cu khng cn phn tch ng th ta c th xa bt Load
Case ny vic phn tch, tnh ton kt cu c n gin hn.Chn ModalDelete Load CaseOKOKthot v mn hnh chnh
3.3. Gn (Assign) tit din v ti trng:Nguyn tc Noun-Verb (chn i tng trc thc hin lnh sau).
3.3.1. Gn tit din cho cc thanh:
- Chn cc phn t 17, 19, 20, 22, 23, 25,
26, 27, 29, 30 AssignFrameSection
hoc dng biu tng chn tit din
D200x350 gn cho cc thanh OK.
- Tng t gn tit din D200x500 cho
phn t 28; tit din D200x550 cho cc phn t
18, 21, 24 Kt qu cui cng nh hnh bn.
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3.3.2. t ti trng vo h:
3.3.2.1. Tnh ti:
- t ti trng phn bu: chn cc phn
t thanh (VD: chn cc phn t 17, 20, 23)
Assign Frame Load Distribute hoc
chn biu tng nhp gi tr lc phn b
u vo mc Uniform Load (VD: 6.48). Tip
tc vi cc phn t khc.
- t ti trng tp trung: chn cc nt (VD:
nt 2, 3, 4) AssignJoint LoadForce
hoc chn biu tng nhp gi tr ti
trng thng ng vo mc Force Golal Z (VD:
-28.75; ch lc hng xung c du - ). Tip
tc vi cc nt khc.
- Sau khi nhp xong ti trng ca trng hp Tnh ti, ta cn kim tra li cc ti trng
nhp bng lnh: DisplayShow Load AssignFrame. Kt qu nh hnh trn.
3.3.2.2. Hot ti 1 v hot ti 2:
7/30/2019 Chuong3b-Vd Tinh Toan Khung
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- Cch t ti trng phn bu v ti trng tp trung tng t nh trng hp Tnh ti
nhng ch cn thay i mc Load Pattern Name t1. TT thnh 2. HT1 (hoc 3. HT2)
Kt qu nh hnh trn
3.3.2.3. Gi tri v gi phi:
- Ngoi vic cn thay i mc Load Pattern Name t3. HT2 thnh 4. GT hoc 5. GP,
y phng ca ti trng phn b cng phi thay i t Gravity thnh X.
- ng thi ti trng gi tc dng vo 2 phn t ct tng 1 khng thuc dng ti trng
phn bu Uniform m phi khai bo l ti trng dng Trapezoidal v dng 2 im (im 1
c khong cch theo cch tnh Absolute l 1.65m, im 2 c khong cch l 5.55m)
- Ch khi nhp ti trng c dng Trapezoidal cn cho gi tr ca ti trng phn bu
Uniform= 0, v ngc li, khi ti trng c dng phn bu Uniform, cn cho gi tr ca ti
trng Trapezoidal = 0, nu khng 2 loi ti trng ny s cng vi nhau thnh ti trng cui
cng tc ng ln h gi tr ti trng khng ng yu cu.
- Cc ti trng thuc trng hp Gi phi s mang du -.
- i Load Pattern Name thnh
4. GT
- i phng lc l phng X
- Chn cch tnh khong cch
theo Abssolute
- Nhp 2 khong cch (1.65;
5.55) v gi tr lc (2.63)
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Kt qu th hin nh hnh di.
3.4 Tnh ton v xut kt qu:
3.4.1. Thc hin tnh ton:
- Khai bo kt cu tnh ton thuc dng h phng: AnalyzeSet Analysis Option
chn XZ planeOK
- Tnh ton: AnalyzeRun Analysis hoc dng biu tng chn Run now
3.4.2. Xem kt qu trn mn hnh:
- Xem kt qu phn lc: DisplayShow Force/Stress Joint hoc dng biu tng
, bm vo tam gic nh bn phi, chn Joint b chn mc Show Result as Arrow
Trn mn hnh s th hin kt qu phn lc ca trng hp Tnh ti.
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Mun thay i trng hp ti trng th hin kt qu trn mn hnh, dng biu tng
nm pha di mn hnh, gn hp chn n v. VD: bm vo mi tn sang phi, mn
hnh s th hin kt qu phn lc ca trng hp Hot ti 1.
- Xem kt qu ni lc: Display Show
Force/Stress Frame hoc dng biu tng ,
bm vo tam gic nh bn phi, chn Frame chn
thnh phn ni lc cn th hin (Axial Force: lc dc;
Shear 2-2: lc ct; Moment 3-3: moment), chn t l
(Auto: t ng hoc nhp h s t l nu chn ScaleFactor), chn mc Show value on Diagram
Trn mn hnh s th hin kt qu ni lc ca
trng hp Tnh ti.
Tng t, mun thay i trng hp ti trng th
hin kt qu trn mn hnh, dng biu tng .
Ch : do quy c du ca Shear 2-2 v lc ct Q theo quy nh ca Vit Nam ngc
nhau nn i vi biu lc ct cn nhp h s t l (khng chn Auto) vi gi tr m.
T l Auto Nhp h s t l vi gi tr m
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3.4.3. Xut kt qu dng hnh nh:
- Khi cn lu kt qu hnh nh ang th hin trn mn hnh thnh file nh (file ny sau
c thc s dng chn vo file thuyt minh ): FileCapture Enhance Metafile
t tn cho file nh . Nh vy hnh nh ang th hin trn mn hnh sc lu li thnh
file hnh nh (dng emf) trn my tnh.
- Khi cn chn hnh nh vo file thuyt minh (file Word): trong phn mm Word:
InsertPictureFrom file: tm n v tr ca file nh trn my v chn vo Word. Kt
qu nh sau:
3.4.4. Xut kt qu dng s (bng tnh Excel):
- Ngoi vic xut kt qu dng hnh nh nh trn, ta cn xut kt qu ni lc ca cc
thanh trong hdng s (bng tnh) thc hin t hp ni lc cng nh tnh ton ct thp
sau ny.
- bng s liu c n gin, trong dm ta ch cn
ly gi tr ni lc ti 5 tit din (u thanh, l, gia thanh,
l, cui thanh), trong ct ta ch cn ly ni lc ti 2 u phn
t. Cch thc hin nh sau: mkha h ( ) c
th sa c gi tr s liu, chn cc phn t dm Assign
Frame Output station hoc dng biu tng :
nhp vo s5, b chn 2 mc Intersection v Concentrated
Biu Moment Biu Lc ct
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Tng t chn cc phn t ct, thc hin lnh, nhp vo s2 v b chn cc mc di
- Tin hnh tnh ton (Run) li kt cu.Lc by gibiu ni lc skhngc mn
v stit din t nn cc ng cong bin thnh ng gy khc.
- Xut kt qu ni lc sang Excel: DisplayShow Table: s xut hin ca s xut
kt qu, bn tri dng chn s liu, bn phi l cc lnh nh chn trng hp ti trng no
ly kt qu (Select Load Case)
Bm vo du cng bn cnh mc Element Output bm tip vo du cng bn cnh
mc Frame Output chn mc Table: Element Force FrameOK(y cn ly kt
qu ca c 5 trng hp ti trng nn khng cn chn Select Load Case). Trn mn hnh s
xut hin bng s liu kt qu ni lc trong hFileExport Current TableTo Excel:
s liu sc tng chuyn thnh bng tnh trn Excel. Kt qu nh sau:
TABLE: Element Forces - FramesFrame Station OutputCase CaseType P V2 V3 T M2 M3 FrameElem ElemStation
Text m Text Text KN KN KN KN-m KN-m KN-m Text m1 0 1. TT LinStatic -147,435 -0,314 0 0 0 -0,6951 1-1 0
1 5,55 1. TT LinStatic -147,435 -0,314 0 0 0 1,0467 1-1 5,55
1 0 2. HT1 LinStatic -42,523 -0,355 0 0 0 -0,6921 1-1 0
1 5,55 2. HT1 LinStatic -42,523 -0,355 0 0 0 1,2774 1-1 5,55
1 0 3. HT2 LinStatic -22,946 0,169 0 0 0 0,2988 1-1 0
1 5,55 3. HT2 LinStatic -22,946 0,169 0 0 0 -0,6407 1-1 5,55
1 0 4. GT LinStatic 74,174 11,765 0 0 0 35,3563 1-1 0
1 5,55 4. GT LinStatic 74,174 11,765 0 0 0 -29,9393 1-1 5,55
1 0 5. GP LinStatic -74,392 -11,767 0 0 0 -35,3574 1-1 0
1 5,55 5. GP LinStatic -74,392 -11,767 0 0 0 29,95 1-1 5,55
2 0 1. TT LinStatic -113,679 -2,197 0 0 0 -3,5847 2-1 0
2 3,6 1. TT LinStatic -113,679 -2,197 0 0 0 4,3234 2-1 3,6
2 0 2. HT1 LinStatic -20,113 -0,376 0 0 0 -1,4234 2-1 0
2 3,6 2. HT1 LinStatic -20,113 -0,376 0 0 0 -0,0713 2-1 3,6
2 0 3. HT2 LinStatic -26,34 -0,752 0 0 0 -0,4582 2-1 0
2 3,6 3. HT2 LinStatic -26,34 -0,752 0 0 0 2,2496 2-1 3,6
- Mi hng trong bng s liu th hin gi tr ni lc (P, V2, , M3) ti 1 tit din
(Station) ca 1 phn t(Frame) trong 1 trng hp ti trng (Output Case)
- Ta chia bng kt qu ny thnh 2 bng (mt bng cha s liu ni lc ca Dm, 1 bng
cha s liu ni lc ca Ct) bng cch copy sheet Element Forces - Frames (gi phm
Ctrl + ko chut sheet Element Forces - Frames sang bn cnh)
Ta c 2 Sheet ging nhau, i tn (kch i chut vo tn Sheet) 1 Sheet thnh Dm, 1
Sheet thnh Ct.
Trong Sheet Dm xa cc hng ca cc phn t 116 (v phn t 116 l ct), trong
Sheet Ct xa cc hng ca cc phn t 1730 (v phn t 1730 l dm).
Gi Ctrl+ ko chut
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Kt cu dm ta cn cc thnh phn ni lc gm Moment (M3) v Lc ct (V2) nn trong
Sheet Dm xa cc ct d liu Case Type, P, V3, T, M2, FrameElem v ElemStation. Kt
qu ni lc dm cn li trong Sheet Dm nh sau:TABLE: Element Forces - Frames
Frame Station OutputCase V2 M3
Text m Text KN KN-m17 0 1. TT -5.133 -4.7994
17 0.6 1. TT -1.245 -2.8857
17 1.2 1. TT 2.643 -3.3048
17 1.8 1. TT 6.531 -6.0567
17 2.4 1. TT 10.419 -11.1414
17 0 2. HT1 -9.451 -2.7008
17 0.6 2. HT1 -5.131 1.6737
17 1.2 2. HT1 -0.811 3.4562
17 1.8 2. HT1 3.509 2.6466
Kt cu ct ta cn cc thnh phn ni lc gm Lc dc (P) v Moment (M3) nn trong
Sheet Ct xa cc ct d liu Case Type, V2, V3, T, M2, FrameElem v ElemStation. Ktqu ni lc dm cn li trong Sheet Ct nh sau:
TABLE: Element Forces - Frames
Frame Station OutputCase P M3
Text m Text KN KN-m
1 0 1. TT -148.155 -0.7373
1 5.55 1. TT -148.155 1.066
1 0 2. HT1 -42.523 -0.6921
1 5.55 2. HT1 -42.523 1.2774
1 0 3. HT2 -22.946 0.2988
1 5.55 3. HT2 -22.946 -0.6407
1 0 4. GT 74.174 35.35631 5.55 4. GT 74.174 -29.9393
1 0 5. GP -74.392 -35.3574
1 5.55 5. GP -74.392 29.95
Sp xp cc s liu trong 2 Sheet trn theo cc trng hp ti trng:
- Trong Sheet Dm, chn tt c cc hng d liu (t phn t 17 n 30)
Vng d
liu chn
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Vo menu DataSort Chn Sort by: (2) Text. Kt qu ta sc cc s liu ni
lc c sp xp lin tc theo cc trng hp ti trng t1. TTn 5. GP.
- Trong Sheet Ct, tng t, chn tt c cc hng d liu (t phn t 1 n 16)
vo menu DataSort Chn Sort by: (2) Text. Kt qu ta sc cc s liu ni lc
c sp xp lin tc theo cc trng hp ti trng t1. TTn 5. GP.
Kt qu nh sau:
Ni lc Dm Ni lc CtDo quy c du ca V2 ngc vi quy c du ca Q theo Vit Nam nn cn nhn cc
gi tr ca V2 trong Sheet Dm vi -1o du.
Kt quc nh sau:
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4. T hp ni lc v tnh ton ct thp trong dm v ct:
Dng file bng tnh lp sn (file Khung.xls).
- Trong Sheet TH M Dm (ca file Khung.xls): nhp tn phn t dm u tin, trong
VD l phn t 17 (v t phn t 116 l phn t ct).
- Copy gi trMoment M3 trong Sheet Dm (ca Sap2000) vo Sheet TH M Dm ny
(chia ct s liu trong bng ni lc do Sap2000 xut ra thnh 5 phn tng ng vi 5 trng
hp ni lc ri copy vo bng t hp thnh 5 ct).
Ct M3 Bng t hp M dm
- Lu gic nh dng ca bng khi paste s liu vo bng TH M Dm, nn
dng lnh (kch chut phi) Paste specialvalue (hoc text)
Kt qu nh sau:
TT HT1 HT2 GT GP Mmin Mmax Mtton
0 -4,63 -2,70 0,18 46,48 -46,51 -51,14 41,85 -51,14/+41,85
l/4 -2,79 1,67 -1,85 24,15 -24,12 -26,91 21,35 -26,91/+21,35
l/2 -3,29 3,46 -3,89 1,81 -1,73 -8,34 1,45 -8,34/+1,45
3l/4 -6,12 2,65 -5,93 -20,52 20,66 -29,92 14,86 -29,92/+14,86
l -11,28 -0,75 -7,96 -42,85 43,06 -57,69 31,78 -57,69/+31,78
0 -50,24 -2,63 -24,29 63,73 -63,91 -132,00 13,48 -132/+13,48
l/4 22,19 -1,81 12,79 32,01 -32,18 -9,99 62,51 -9,99/+62,51
l/2 46,87 -0,99 24,93 0,28 -0,45 45,57 71,80 71,80
3l/4 23,79 -0,17 12,12 -31,44 31,28 -7,65 62,85 -7,65/+62,85
l -47,04 0,64 -25,64 -63,16 63,01 -126,97 15,96 126,97/+15,96
0 -9,13 3,93 -10,03 44,66 -44,40 -58,12 35,53 -58,12/+35,53
l/4 -7,91 2,59 -7,62 21,37 -21,19 -33,83 13,66 -33,83/+13,66
l/2 -6,93 1,24 -5,21 -1,91 2,03 -13,34 -3,98 -13,34
3l/4 -6,19 -0,10 -2,80 -25,19 25,25 -31,48 19,06 -31,48/+19,06
l -5,69 -1,45 -0,39 -48,48 48,46 -54,17 42,77 -54,17/+42,77
T hp
BNG T HP MOMENT DM KHUNGPhn
t
Trng hp ti trng (n vKN.m)Titdin
17
18
19
1.TT
2
.HT1
3.HT2
4.GT
5.GP
1.TT
2.HT1
3.HT2
4.GT
5.GP
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- Xa cc hng s liu tha (v trong bng tnh c lp tnh c ti a 46 phn t
dm, m trong h ch c 14 phn t dm, nn phi xa cc hng phn t t 31 tri)
- Trong Sheet TH Q Dm: Copy gi tr Lc ct V2 ( o du vi kt qu m Sap
xut ra) trong Sheet Dm (ca Sap2000) vo Sheet TH Q Dm ny (cng theo cch nh trn,
5 phn trong 1 ct ca bng ni lc thnh 5 ct s liu trong bng t hp). Lu gic
nh dng ca bng khi paste s liu nn kch chut phiPaste specialvalue (hoc text)
Kt qu nh sau:
TT HT1 HT2 GT GP Qmin Qmax |Q|max
0 5,01 9,45 -3,39 -37,22 37,32 -32,22 47,10 47,10
l/4 1,12 5,13 -3,39 -37,22 37,32 -36,11 39,32 39,32
l/2 -2,77 0,81 -3,39 -37,22 37,32 -39,99 34,55 39,99
3l/4 -6,66 -3,51 -3,39 -37,22 37,32 -46,37 30,66 46,37
l -10,55 -7,83 -3,39 -37,22 37,32 -54,15 26,77 54,15
0 53,51 0,46 27,53 -17,62 17,63 35,88 94,56 94,56
l/4 26,98 0,46 13,67 -17,62 17,63 9,35 55,56 55,56
l/2 0,44 0,46 -0,19 -17,62 17,63 -17,18 18,07 18,07
3l/4 -26,09 0,46 -14,05 -17,62 17,63 -54,59 -8,46 54,59
l -52,62 0,46 -27,91 -17,62 17,63 -93,60 -34,99 93,60
0 3,58 -3,59 6,43 -62,09 61,91 -58,51 65,50 65,50
l/4 2,94 -3,59 6,43 -62,09 61,91 -59,15 64,85 64,85
l/2 2,29 -3,59 6,43 -62,09 61,91 -59,80 64,21 64,21
3l/4 1,65 -3,59 6,43 -62,09 61,91 -60,44 63,56 63,56
l 1,00 -3,59 6,43 -62,09 61,91 -61,09 62,92 62,92
0 8,32 -3,38 10,76 -22,23 22,19 -14,72 37,97 37,97
l/4 4,43 -3,38 6,44 -22,23 22,19 -18,61 30,20 30,20
l/2 0,54 -3,38 2,12 -22,23 22,19 -22,50 22,73 22,73
3l/4 -3,34 -3,38 -2,20 -22,23 22,19 -28,37 18,85 28,37
l -7,23 -3,38 -6,52 -22,23 22,19 -36,15 14,96 36,15
T hp
BNG T HP LC CT DM KHUNG
Phnt
Trng hp ti trng (n vKN)Titdin
17
18
19
20
Xa cc hng s liu tha t phn t 31 tri.
- Tng ti vi Sheet Ct (kt qu t Sap2000), copy gi tr ca lc dc P v moment
M3 ca bng ni lc do Sap2000 xut ra, vo bng t hp ni lc ct trong SheetTH M,N
Ct (mi ct ni lc gm 5 phn, copy thnh 5 ct tng ng vo bng t hp), nn chnPaste special gic nh dng.
Kt qu nh sau:
7/30/2019 Chuong3b-Vd Tinh Toan Khung
19/19
V d tnh ton h khung phng
TT HT1 HT2 GT GP TT HT1 HT2 GT GP Mmax Nt Mmin Nt Mt Nmax
1 C -0.74 -0.69 0.30 35.36 -35.36 -148.16 -42.52 -22.95 74.17 -74.39 34.62 -274.03 -36.09 -222.55 -32.91 -274.03
1 1.07 1.28 -0.64 -29.94 29.95 -148.16 -42.52 -22.95 74.17 -74.39 31.02 -222.55 -28.87 -73.98 28.59 -274.03
2 C -3.73 -1.42 -0.46 16.54 -16.56 -114.27 -20.11 -26.34 36.95 -37.07 12.81 -189.44 -20.33 -189.44 -20.33 -189.44
2 4.45 -0.07 2.25 -18.49 18.48 -114.27 -20.11 -26.34 36.95 -37.07 23.11 -189.44 -14.04 -77.32 23.05 -189.44
3 C -4.12 -0.35 -1.42 11.00 -10.98 -77.00 -23.49 -2.62 14.72 -14.88 6.88 -113.90 -15.60 -113.90 -15.60 -113.90
3 4.71 1.50 0.41 -12.11 12.09 -77.00 -23.49 -2.62 14.72 -14.88 17.32 -113.90 -7.40 -62.28 17.32 -113.90
4 C -3.89 -1.64 -0.37 4.65 -4.66 -39.25 -0.15 -5.84 2.64 -2.83 0.75 -47.19 -9.90 -47.19 -9.90 -47.19
4 2.30 0.58 1.33 -5.57 5.61 -39.25 -0.15 -5.84 2.64 -2.83 9.07 -47.19 -3.28 -36.62 9.07 -47.19
5 C -7.86 0.56 -4.20 90.06 -88.84 -484.83 -101.15 -99.96 -33.47 33.69 82.20 -635.51 -96.69 -451.14 69.91 -695.95
5 14.91 -1.40 8.42 -68.92 70.28 - 484.83 - 101.15 -99.96 -33.47 33.69 85.74 -635.51 -54.02 -518.30 -40.81 -695.95
BNG T HP NI LC CT KHUNGPhn
t
T hp cbn tnh tonTitdin
Lc dc (n vKN)Moment (n vKN.m)
Xa cc hng s liu tha (t phn t 1740).
- Thc hin tip vic tnh ton ct thp trong cc Sheet tnh thp trong file Khung (chn
vt liu b tng, ct thp, nhp tit din, khong cch a, khi tnh ct ai cn nhp gi tr tnhti v hot ti phn bu vo dm, chn sb cch b tr ri xem cc kt qu kim tra c
tha mn,sbtstt, smax, sct, l1l/4?). Ch khi tnh thp ct cn phi thay i gi trgtsao cho
xp xtt(cch nhanh nht l copy cttt ri paste special - value vo ctgt, thc hin vi ln
nh vy th s liu 2 ct s xp x nhau), ng thi chiu di tnh ton lo phi c xc nh
theo tiu chun TCXDVN 356-2005 (ty thuc vo s khung 2 nhp, 3 nhp ).