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NG DUNG ETABS-TRONG THIET KE
NG DUNG ETABS TRONG THIET KE KET
CAU VACH CNG NHA CAO TANG NOTES: Vi cac cong trnh nha cao tang
phan t vach la khong the thieu.Co nhieu quan iem thiet ke vach.Nhng
bai 1 toi xin c trnh bay quan iem tnh vach nh sau: Xem vach la cau
kien cot chu nen uon va tnh vach nh bnh thng.Ket hp vi Etabs e
thiet ke va co ieu chnh e bo tr thep cho hp ly. - Vach co nhieu
dang nhng chung ta nen a ve dang vach co hnh ch nhat e de dang tnh
toan.Nh sau:
X
Y
Nz
1 1'
Mx
B
H/5 H/5
Thep cau tao a=200
H
Vic tnh toan thep chu yeu trong 2 vung 1 va 1.Thep trong vung
gia c at theo cau tao.Thng la 16a200(>12).Bai toan at ra : Sau
khi ngi s dung xuat ra c noi lc trong vach( Etabs) gom momen Mx va
lc doc Nz.Chung ta li dung Etabs thiet ke thep cho chung ta(chieu
cao vach chnh la chieu cao tang nha)
Cac thong so ieu chnh e Etabs thiet ke theo TCVN
Gia tr fc tng ng vi Mac Be tong theo TCVN
Mac Be tong 200 250 300 350 400 500
Rn (kg/cm2) 90 110 130 155 170 215
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f'c (T/m2) 1822 2244 2673 3219 3552 4579
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NG DUNG ETABS-TRONG THIET KE
Gia tr fy tng ng vi loai cot thep theo TCVN
Loi thep AI AII AIII CI CII CIII
Ra (kg/cm2)
2100 2700 3600 2000 2600 3400
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fy (T/m2) 24701 31765 42353 23530 30589 40000
Gia tr K t ng ng vi Mac be tong va ham lng cot thep Gia s ham
lng cot thep ga thiet la gt=1,5%
Mac BT 200 250 300 350 400 500 He so K 0.67 0.69 0.71 0.72 0.73
0.75
V du cu the
Cho vach co chieu dai vach H=4.3 m, Chieu rong vach B=0.25
m,Chieu cao tang nha =3.2 m, Vach chu lc doc Nz=1050(T), Momen uon
quay quanh
phng chu lc Mx(hoac My-tuy cong trnh->cac gia tr nay c xuat
ra t Etabs (phng dai H).Vach lam bang Be tong M300,thep chu lc CII,
thep
ai CI Trnh t tnh toan nh sau: 1.Khi ong chng trnh Etabs(Sap2000
cung lam c-nhng xin phep trnh bay ay cach lam Etabs) - Click up
chuot vao bieu tng Etabs tren man hnh
Hoac nhan Start/All programs/Computer and Structure/Etabs
9/Etabs 2.oi n v s dung goc di ben phai man hnh qua n v SI: T,m(he
n v mac nh cua chng trnh la Kip-In
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NG DUNG ETABS-TRONG THIET KE
3.Click vao Menu File -> New Model Hop thoai New Model
Initialization xuat hien
Click chon No 4.Nhap cac gia tr trong Hop thoai Buiding Plan
Grid System and Story Data Definition nh sau: 5.Click OK e thoat
khoi hop thoai Buiding Plan Grid System and Story Data Definition
6.Khai bao vat lieu cho vach Click Define -> Material
Properties
Hop thoai Define xuat hien
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NG DUNG ETABS-TRONG THIET KE - Click chon CONC( Vat lieu Be
tong) - Click Modify/Show Material
Hop thoai Material Property Data xuat hien
Nhap cac thong so nh tren( Tra t bang a cho) Click OK e ket thuc
viec khai bao vat lieu 7.Khai bao tiet dien cho vach ( luc nay xem
nh cot) Click Define -> Frame Sections
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NG DUNG ETABS-TRONG THIET KE
Hop thoai Define Frame Properties xuat hien
Chon Add Rectangular
Hop thoai Rectangular Section xuat hien
Nhap cac gia tr nh tren Click 2 lan OK e ket thuc khai bao tiet
dien
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NG DUNG ETABS-TRONG THIET KE
8.Khai bao trng hp tai trong Click Define -> Static Loads
Case
Hop thoai Define Static Loads Case Names xuat hien
Nhap cac gia tr nh tren ( ta xet noi lc trong vach nh tren ch la
trng hp TT+HT-chng trnh t tnh tai trong ban than cho ta nen nhap
gia tr o Self Weight Muliplier la 1.1( 1.1 chnh la he so vt tai oi
vi trng hp TT) 9.Khai bao to hp tai trong Click Define -> Loads
Combinations Click Add New Combo
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NG DUNG ETABS-TRONG THIET KE
- Click 2 lan OK 10.Gan tiet dien Chu y: Gan cot(vach) ch gan c
tren mat bang do o chung ta chuyen qua mat bang e gan Click chon
bieu tng tren va chon Story1( elev: chon mat ng) - Click vao bieu
tng nh ben di trong thanh cong cu
- Chon tiet dien can gan dong Properties la COT25430( a khai bao
ben tren)
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NG DUNG ETABS-TRONG THIET KE
- Click nut tai v tr muon gac cot( vach) hoac re chuot tao vung
bao Ket qua sau khi gan nh sau: 11.Gan ieu kien bien - Click chon
goi nh sau
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NG DUNG ETABS-TRONG THIET KE
- Click Menu Assign -> Joint/Point -> Restraint - Click
chon bieu tng ngam nh tren 12.Gan tai trong - Click Chon nut tai au
tren cua cot - Click Menu Assign -> Joint/Point Loads ->
Forces
Hop thoai Point Forces xuat hien Gan trng hp Tnh tai( TT) lc doc
tac dung len cot( vach) nh tren
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NG DUNG ETABS-TRONG THIET KE
Gan trng hp Hoat tai(HT) Momen tac dung len cot(vach) nh tren
13.Gan bac t do Click Menu Assign -> Analyze -> Set Analysis
Options - Click vao bieu tng XZ Plane - Click OK
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NG DUNG ETABS-TRONG THIET KE
14.Chay chng trnh - Click Menu Assign -> Analyze -> Run
Analysis - at ten muon lu File va Click chon Run
THIET KE THEP Sau khi Run khong bao loi chung ta bat au tien
hanh thiet lap cho chng trnh t thiet ke thep 1.Click Options ->
Preferences -> Concrete Frame Design
Hop thoai Concrete Frame Design Preferences xuat hien - Click
chon CSA-A23.3-94 - Click OK 2. Click Design -> Concrete Frame
Design -> Select Design Combos
- S dung nut Remove( Bo) va Show( Chon) e chon to hp thiet ke la
to hp BAO - Click OK
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NG DUNG ETABS-TRONG THIET KE
3.Chon phan t cot tren 4.Click Design -> Concrete Frame
Design -> View/Revise Overwrites
Thay oi so lieu nh tren(cho phu hp vi TCVN) - Click OK 5.Run mot
lan na 6. Click Design -> Concrete Frame Design -> Star
Design/Check of Structure Luc nay tren cua so lam viec se xuat hien
so tiet dien thep thiet ke.e de kiem soat theo TCVN ta a n v lai ve
dang Ton-cm
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NG DUNG ETABS-TRONG THIET KE
Nh vay theo Etabs tnh toan lng cot thep can cho cot tren la
151.543 cm2(Tong lng thep tren mat cat ngang) Ta tien hanh ieu chnh
nh sau e chuyen thanh thep trong vach Lng thep tnh ra trong vach se
c bo tr cho 2 vung (H/5, H/5+(1->50 cm) 2 bien, con phan gia
(3H/5, 3H/5-2.50(1-> 50cm) c at theo cau tao la thep 16a200.1-50
cm la gia tr dao ong e viec bo tr sao cho vung at thep cho ra mot
gia tr tng oi chan, am bao ieu kien thi cong Bo tr thep nh sau:
H/5=4.3/5=0.86m->0.9m=900 mm Lng cot thep can =151.543
cm2/2=75.8 cm2
Chon thep 22,so thanh thep can la 75.8/3.8=19.95 thanh So thanh
thep vung bien nen chon la so le.Vay so thanh thep c chon bo tr
la:21.Khoang cach gia 2 thanh thep a=900/[(21-1)x2]=100 Vung gia
=4.3-2x0.9=2.5m=2500 mm Chon thep cau tao la 16a200
250
4300
22a100 22a10016a200 16a20016a100
22a100 22a10016a200 16a20016a100
NOTES: Viec tnh toan va at cot thep nh tren ch la mot e xuat.Cac
ban nen kiem tra vi cac cong trnh trong thc te.e rut ra kinh nghiem
va kiem tra e xuat tren co ung hay khong.Ve pha ca nhan toi th viec
tnh toan va bo tr thep trong vach nh tren la ung va thien ve an
toan, tham ch la d. Xin nhan c y kien ong gop cua cac ban e co the
trnh bay e xuat quan iem tnh toan th 2. Than chao! Tai lieu - Ca
nhan tham khao - Th.s Nguyen Hu Anh Tuan Phan tch va thiet ke ket
cau bang Etabs- mot so v du thc hanh - Tai lieu lu hanh noi bo -
Nguyen Khanh Hung : Thiet ke va tnh toan cot thep bang Sap 9.03-
NXB thong ke- Phat hanh toan quoc - Ks Le Thanh Ng Cong ty An Phu
Gia - TP.HCM - Ks Nguyen Xuan Dieu Tap oan Hoa Bnh Tp.HCM - Ks
Nguyen Van Thanh Cong ty Phat Trien Nha Cao Tang - Ks Nguyen Duy
Phch Cong Ty T Van Thiet Ke XD Lac Hong
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