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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


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


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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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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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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- 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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- 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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- 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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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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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



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



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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