TAP CHi KHOA HQC VA CONG NGH?, Trucmg Djii hoc Khoa hpc, DH Hue Tap 9, So 1 (2017)
DAM LIEN HQP THEP - BE TONG TRONG CAC CONG TRINH VU'(pT NHIP TU" 8m DEN 18m
Nguyen Trpng Vinh Khoa Khoa ICi&i true, Tnrdng Dgi hgc Khoa hgc, Dgi hgc Hue Email: [email protected] T 6 M TAT
Cho den nay da co rat nhieu gi^i phap thief ke ket cS'u dupe ap dyng cho cac cong trinh cd nhip Ion, pho bien nhu ket caii be tdng cot thep ung luc trudc th6ng thudng, ket caii san bong hay giai phap kef cau lien hpp thep be tong... M6i giai phap thief ke deu co nhimg uu khuyet diem rieng bi^t, viec nghien cuu ap dung giai phap phii hgp cho timg e6ng trinh de mang lai hieu qua cao la nhiem vy cua ngudi thiet ke.
Mye ti§u cua de tai la nghi&n ciiu co sd ly thuyet va quy trinh tinh toan Dam li&n hpp Thep - Be tong cot thep theo Eurocode 4 cua c6ng trinh cong cong c6 nhip tCr 8m den 18m. Tir cae ket qua thu duoc se rut ra nhiing kien nghi ve giai phap thiet ke cho dam lien hpp ciia cac c6ng Uinh nha co kich thude nhip Itin tir 8m den 18m.
Tii khoa: dam lien hpp, dam nhip Idn, ket caii lien hgp thep-be tong.
1. MO DAU
Cimg vdi xu the hdi nhgp Quoe te oia Viet Nam, trong nhiing nam gan day nhu cau xay dung cac cdng trinh the thao van hda cd kieh thude nhip Idn dang bimg nd mgnh me d Nude fa. Khi thief ke cac edng trinh nhu tren ddi hdi Ngudi thief ke phai nghien a i u dua ra gjai phap nham toi uu hoa kich thude eac cau kien ket cau, giam chi phi tdi da cho edng trinh ma van bao dam khdng gian sir dung, tinh tham my va mue tieu can dat dupe khi dua vao khai thac sii dung cdng trinh.
Cho den nay da ed rS't nhieu phuang an thief ke dupc ap dung nhu: giai phap ket eau be tdng cot thep thdng thudng, giai phap ket cau be tdng iing luc trudc hay giai phap ket cau lien hop thep be tdng, nhiing giai phap dd da va dang dupe sir dung pho bien d nhieu nude tren The gidi eho eae edng trinh nha nhieu tang ciing nhu eae cdng trinh cd kich thuoc nhip Idn. Mdi giai phap thief ke dupe sir dung cd nhiing im khuyet diem rieng biet, nghien eiiu dua ra giai phap phii hpp ap dung eho timg edng trinh se cd tinh quyet dinh mang den hieu qua eao khi dua vao khai thae sir dung.
D'dm lien hgp thep - be tdng trong cdc cdng trinh vuat nhip tie 8m deh 18m
Muc tieu eiia de tai la nghien ciiu, co sd ly thuyet va quy trinh tinh toan Dam lien hpp Thep - Be tdng cot thep theo Eurocode 4 ciia cdng trinh cdng cdng cd nhip fir 8m den 18m. Tir eac ket qua thu dupe se nit ra nhung \den nghi ve giai phap thief ke eho dam lien hop eua cae edng trinh nha cd kieh thude nliip Idn tir 8m den 18m.
2. PHU'ONG PHAP NGHIEN CUtJ
Phuang phap ngiiien ciiu: dimg phuang phap ly thuyet.
CJ day ta ti&i hanh lim hieu ly thuyet tinh toan d^m lien hpp thep-^e tong theo tieu ehu&i Eurocode 4 (Design of composite steel and concrete structures) va fheo Eurocode 4, dam lien hpp fhep-be tdng phai dupe kiem tra tinh toan fheo trang thai gjdi han nhu sau:
2.1. Trgng thai gjdi han 1 (trang thai gidi hgn ve cudng dp)
Trang thai pha hdng (trang thai gidi han ve eudng dp). Khi khao sat tiieo trang thai gidi han ve pha hogi eho mpt tiet dien ngang cuamdt eau kien hay mot lien ket yeu eau:
Sd< Rd (1) Trong dd, Sd : Gia tri tfnh toan o i a eac tae ddng, khi xae dinh Sd phai ke den cac
to hop tai trpng nguy hiem khi sir dung ciing nhu khi thi cdng, lap dung; Rd: Siic ben tinh toan tuong iing cua tiet dien kiem tra, Rd pu thupe vao eudng dp dae trung eiia cac loai vat lieu tren tiet dien:
Rd = Rd( fy/ya, fck/yc, fWys, WY^P ) (2) Cac ky hieu nhu sau: fy: gidi han chay ciia vat lieu thep; ya: he so an toan vat
lieu cho thep, trir trudng hpp kiein tra dn dinh a i a phan thep (oan, eong venh) dupc dieu ehinh bang he so YRd= 1,1; f*: cudng dp ciiiu nen ciia be tdng; yc: he so an toan oia vat heu be tdng, y,r= 1,5; fys: gidi hgn chay cua vat lieu cot thep thanh; ys: he so an toan vat lieu cot thep tiianh, yE= 1,15; fyp: gidi han chay eiia vat lieu lam tdn san; yap: he so an toan vat lieu eua tdn san, yap = 1,1.
* Cdc gid thiet tinh todn:
- Lien ket giiia san va dam la lien ket hoan toan.
- Tat ea eae thd cda dam thep deu hda deo do keo hoac nen khi chiu luc.
- ting suat trong phan be tdng chiu nen la phan bo deu va bang 0,85.fck/yc - Bd qua kha nang chiu keo cua be tdng.
- Cdt thep ciia tam dan khi chju keo se bi chay dong thdi se dgt den cudng dp tinh toan fsk/ys.
- Bd qua kha nang chiu nen cua cot thep va tam tdn.
TAP CHI KHOA HOC VA CdNG NGHg^ Truong Dai hpc Khoa ho*; DH Hue T|ip 9, So 1 (2017) 2.1.1. Kiem tra tiet dien dam chiu momen duong (tai nhip)
- Trudng hgp 1: True trung hoa ndm trong bdn be tong
II
Dffiu Men ap dvmg: Fc>F.vai F,=^^^^ ; F^ = \b^.{- ^) (3) Trong do: F.: siic ben deo ciia fliep hinh Idii chiu keo; F.: siic ben deo cua ban be khi chiu nen; Aa: dien tich tiet dien thep hinh.
Hinh 1. Bieu do ung suat deo khi TTH di qua ban be tong (uon duong) Vj tri o i a true trung hoa d^o so voi mat tren ciia ban san z duoc tinh:
Tinh toan momen ben theo h(?p luc ciia vimg be tong chiu nen:
(4)
M*,
. . . - ( t + Y + Y ) - ( ^ . - ^ . ) ^
- Trucmg hgp 2: True trung hda di qua bdn cdnh cita ddm thep Dieu kien ap dung: F^ -F^ < 2.bj-Jj^.(fy//^)
True trung hBti ( Nftn )
(5)
{ Kfio ) c Keo ) Hinh 2. Bieu do ung suat d^o khi TTH di qua ban canh dam thep (uon duang)
U5m lien hap thep - be tdng trong cdc cong trinh vuat nhip tit 8m deii 18m Khoang each z nit ra tir phuang trinh can bling:
2 . b f ( z - h . - hp).f.
F.= K+-
T . - ( F . - F c ) ) 2.f,,.b,
(6) (7) De tinh momen ben deo eua tiet dien fa lap phuang trinh momen vdi trpng tam vimg be tdng ehiu nen:
M*,
.iM -FA—+—+^J-(.K-K)-
- Truong hap 3: True trung hoa di qua bung cua dam thep
Dieu kien ap dung: F^ —F^ > 2 i > ^ i ^ . ^ . —
(8)
(9)
{ Kfai ) ( Kte )
Hinh 3. Bi^u dB irng suat deo Idii TTH di qua ban bung dam thep (uon duong) Khoang each: z- = F,/(2twf,/y.)
Momen ben deo lay vol trong tam ciia dam thep:
,h- h, . . , F,.z„
2 fy M* = M, •piRd-P.Cy+Y + h , ) -
Voi MapLRd la momen ben deo ciia tiet dien dSm thep: M^
=W„
(10)
(11) (12) 2.1.2. Kiem tra tiet di?n dam chiu momen am (tai goi)
- Trubng hap 1: True tnmg di qua hdn canh cua dam thep A . f i k
Vai Fs la siic ben deo cua cac cot thep, ^ = (13)
TAP c m ' KHOA HOC VA CONG NGHt Tniong Dga hoc Khoa hpc, DH Hue
Dieu kien ap dpng: Fa>Fs va F^—F^i
I
:EE
2.fy.b.t,
• < '^ f f Va Trjc ttunii hflq ( Kia )
Tap 9. So 1(2017)
(14)
I »•
^
31-?
t a .H> 4
( NK. ) ( Nin )
Hi7ift 4. Bieu do iing suat d^o khi true tmng hoa di qua canh dam thep (uon am) Chieu day ciia eanh chju keo dupc xae dinh theo dieu kien can b3ng:
F ^F -1- i—L-L
(15) Momen ben dupc tinh khi lay tong momen vol true trpng fam ciia ldp cot fhep:
M~pd ^=^a(K/2-\-K)-(F,-F^)(z^/2+h^) - Trucmg hgp 2: True trung di qua ban bung cua dam thep
(16)
Trjc lumg tijg ( Keo )
[ 1*" ) ( Str }
Hinh 5. Bieu dS iing suat deo khi true trung hbaqua bung dam thep (uon am) Chieu eao a i a ban bung ehiu nen nam tren trpng tam eiia tiet dien dam fhep:
Z»- = Fs/(2fwfy/Y.) (17) Momen ben lay vdi trpng tam eiia dam thep:
M - , = M,„ , +7^(h„ / 2 + h , ) - / ^ / / ( 4 C / / r „ ) (18)
Ddm liin hgp thep - bi tdng trong cdc cdng trinh vugt nhjp tie 8m dm 18m
2.1.3. Kiem tra lue eat eiia tiet dien: ^«, ^ Kj_ju = A , - - ^ (19) Dieu kien ap dpng: khi ban bung khdng ed sudn tang cudng diing trung gian
(trir cae sudn goi), dieu kien ap dung: d 11^< 69s (20) - Trudng hpp dam thep dupe bpc be tdng phan bung, ed cot dpc va cot dai fhi
dieu kien ap dung: d/t„<\24s (21) Trong dd: Av la dien tich ciia dam thep chiu cat dupc lay nhu sau: dam td hpp
han: Av = Aw = hw.tw; Dam thep hinh: Av = Aa-2bf .tf + (tw+2r ).ti (r la ban kinh eong eho tiep xuc giiia canh va bung)
2.1.4. Kiem tra oan cho tiet dien dam fhep: khdng xet trong pham vi bai nay, van de nay se dupe de cap ehi tiet trong bai viet sau.
2.2. Trang thai gidi han 2 (Trang thai gidi hgn khi sii dung)
- Tinh toan theo trang thai gidi han su diuig eiia dam Uen hpp gom:
+ Kiem tra ve dp vdng + Ki&'m tra si^ niit ciia be tdng
2.2.1. Kiem tra dp vdng: 5f<[f] (22) Trong do: 5f la dp vdng Idn nhat cua dam; [{\ la dp vong cho phep eiia dam, gia
trj oia dp vong gidi han a i a dam lien hop eiing lay nhu doi vdi dam thep theo Bang 1 Bdng 1. Cia tri gidi ban ciia dp vong thang diing cho d§m vl san
Trong cac logi ket cau Mai ngdi chung
Mai ehiu fai trong ngudi thudng xuyen hay siia chiia, bao dudng San ndi chung
San va mai ehiu tai trong tudng ngan bang thach cao hoac kinh San do cpt
Gia tri ^9 vong gidi hgn
L/200 L/250 L/250 L/250 L/400 2.2.2. Kiem tra niit trong be tong:
fl. Kiem tra ham lueng thep tdi thieu chiu momen tai goi tren he rong b^H - Ham luong cot thep tai goi: Ms A ,
b e f f . h .
.100% (23)
- Dieu kien kiem tra: )k >(to«. - 0,4% (Ham luong cot thep toi thieu)
TAP CHi KHOA HQC VA C6NG NGH?,£niOTg D^i^hgc lOioa hpc^ Hue b. Kiem tra hdm lugng cdi thep de'hgn chi'su ma rgng cita vel nut
k.fcfA^.k A, > A,„
Tap 9, So 1(2017)
(24)
Trong dd, Asmu.: ham lupng cot thep toi tiiieu; k = 0,8: h | so lam giam siic ben ciia be tdng khi chiu keo; kc= 0,9: he so ke d m su phan phoi dgng tam giac ciia bien dang trong tiet dien lien hpp khi nut; fa = 3 N/mm': eudng dp trung binh eiia be tdng lay d tudi 28 ngay; Act: dien tieh ban b^ tdng chiu keo: Act = hcbeff; Os: iing suat cho phep ciia fhep ngay khi hinh thanh vet niit (bang 2.2)
Bdng 2. fJng suat cho phep Idn nhat trong cot thep Dudng kinh max (mm) tiianh
thep 10 12 16 20 25 32
(Iliieu rdng tinh toan eua vet mit Wk = 0,3 mm
Wk = 0,5 mm
Ung suat Idn nhat eiia thep Os (N/mm^) 450 I 400 I 360 I 320 I 280 I 240 1 200 I 160 500 500 500 450 380 340 300 260
3. KET QUA VA THAO LUAN
Thuc hien tinh toan vdi dam khung eiia mdt edng trinh tnmg tam thuong mai ed quy md 3 fang ed 1 nhip, vol bude cdt B=8m, vdi chieu cao tang la 4.5m va ehieu rpng nhip thay doi tir 8 den 18 m. De don gian ta se tien hanh tinh toan eho dam khung hue B fang 2 oia nha vol nhip lan lupt la L=18m; 16,5m; 15,0m; 12,5m 10,0m va 8,0m fheo ly thuyet tinh toan eiia tieu chu&i Eurocode 4.
^k^^ 1
Hinh 6. Mat bang he ket cau dam san Hinh 7. Mat cat ngang dien hinh ciia dam 203
D'dm lien hgp thep - be tdng Irong cdc cdng trinh vu0 nhip tie 8m dat 18m
De dan gian tinh toan, ta ehpn chieu day san la ISOmm vdi h^ dam tiiep la dam to hpp ban, chieu cao sdng tdn hp=0 mm; Chi tinh vdi 2 trudng hpp tai trpng la linh tai va hoat tai vdi gia thiet trpng luong hoan thipn va cae vach ngan co dinh tren san tam lay la 12 kN/m^; Hoat tai tren san: 0,4 kN/m^ vdi he sd vupt tai n=l,2 (cd xet den fai trpng ban than eua dam fhep). Thuc hien tinh toan bSng phan mem Sap2000 fa ed npi luc ciia cac dam d bang sau.
Bdng 3. Npi luc ciia dam NQI Ivcc
Moment tai nhip Moment tai goi Luc cat tai goi
D o n v i kNm kNm kN
L=18m 2356.7 4102.6 1423.5
L=16.5m 1992.0 3356.2 1302.4
L=15m 1666.6 2757.4 1180.7
L=12.5m 1176.1 1890.6 980.6
L=10m 778.7 11876 781.8
L=8m 515.4 743.0 624.0 Chpn vat lieu sii dung de tiiiet ke dam lien hop fhep - b^ tdng nhu sau:
- Be tdng B25 ed:
+ Cudng dp tinh toan ehiu nen: Rb = 14,5 MPa + Cudng dp tinh toan ehiu keo: RBI = 1,05 MPa + Md dmi dan hdi: Eb = 30000 MPa - Cdt thep Cn vdi:
+ Cudng dp tinh toan chiu keo: Rs = 365 MPa + Cudng dp tinh toan chiu nen: Rsc = 365 MPa + Md dun dan hdi: Eb = 210000 MPa - Thep dam dung Mac fhep CCT42:
+ Cudng dp tieu chu&: fy = 260 MPa + Cudng dp keo diit tieu chuan: fu = 420 MPa + Cudng dp tinh toan: f = 245 MPa
Tien hanh Ivea ehpn so bd tiet dien fir dd ta ed cae dac trung hinh hpc eiia diim, ket qua tong hpp cho d bang sau:
TAP c m KHOA HOC vA CONG NGHE, Jnrtmg D?i hpc Khoa h(?c, DH Hue j r j p 9^361(2017) Bang 4. Kich thuoc tiet dien dam va cac d|c trung hinh hpc oia dam S T T
1 2 3 4 5 6
D a h i L-18.0m L=16.5m L-15.0m L=12.5m L-lO.Om L=8.0m
H 1000
900 850 700 550 450
t»
20 20 20 18 16 14
b i 350 320 300 250 200 180
tf 30 30 24 24 22 18
A . 39,800 36,000 30,440 23,736 16,896 12,276
.-,. ..g.^J^Jl^ff,- 6,325,606,667 4,622,400,000 3,316,634,147 1,787,255,712 786,418,688 385,290,108
Wpi 12,651,213 10,272,000 7,803,845 5,106,445 2,859,704 1,712,400 Ti&i hanh di Idem tra tiet dien da chpn theo Eurocode 4 n h u da i qua tdng hpp cho d cac bang sau:
Bdng 5. Kiem tra tiet d i ^ chiu Momen duong tai ntiip
S T T 1 2 3 4 5 6
D a m L=18.0m L=16.5m L=15.0m L=12.5m L-lO.Om L - 8 . 0 m
h e ( m m )
150 150 150 150 150 150
(mm).
2250 2062.5 1875 1562.5 1250 1250
b+«f ( m m ) 4 5 0 0 4 1 2 5 3750 3 1 2 5 2500 2000
( k N ) 10348 9360 7914.4 6171.36 4392.96 3191.76
z (imn)
176 170 166 163 158 153
M + p l . R d ( k N m )
6,374 5,204 4,164 2,758 1,599 981
M + S d ( k N m ) 2,357 1,992 1,667 1,176 779 515
K L O K O K O K O K O K O K
M 1
1- ^
•r
45 6
1 Dam
L-18.0m L=16.5m L=15.0m l,=12.5m L-lO.Om L - 8 . 0 m
h e ( m m )
150 150 150 150 150 150
idng 6. Kiem tra dieu kien chiu m o m e n am t?i goi Lo
( m m ) , ^' 2250 2062.5 1875 1562.5 1250 1,250
b*Mf ( m m )
4500 4125 3750 3125 2500 2,000
• F . ' ( k N )
10348 9360 7914.4 6171.36 4392.96 3,192
z ( m m )
176 170 166 163 158 153
M^pUtd ( k N m ) 4,905 4,032 3,250 2,177 1,308 835
M-Sd ( k N m )
4,103 3,356 2,757 1,891 1,188 743
K L
OK OK OK OK OK OK Bang 7. Kiem tra ti^t dien khi cfiju cat
S T T 1 2 3 4
D a m L = 1 8 . 0 m L = 1 6 . 5 m L = 1 5 . 0 m L = 1 2 . 5 m
A . (mm^)
39,800 36,000 30,440 23,736
VplJld ( k N m )
3,002 2,702 2,552 1,891
Vsd ( k N m )
1,416 1,298 1,181 9 8 3
K e t l u a n O K O K O K O K
Dam lien hap thep - he tong trang cac cdng trinh mat nhip tit 8m dm Wm 5 I L=10.0m 16,896 | 1,321 I 782
Bang 8. Tong hop tiet dif n dam tu L=l&j-8m
Npi lylc Moment tai nhip Moment taipoi Luc cat t?i
goi
Tiet dif n dam
Nhip dam L M+
M- Qmax Chieu cao tiet
d i e n h Be day ban
bung tw Be rong ban
canhbf Be day ban
canhtf Tyle:L/h Ty le: hyb
Don
kNm kNm kN mm mm nun mm
1 ^ &
18m 2356.7 4102.6 1415.7 1000
20 350 30 18.0 2.857
if* - 16.5m 1992.0 3356.2 1297.7 900
20 320 30 1S.3 2.813
15m 12.5m 1666.6
2757.4 1180.7 850
20 300 24 17.6 2.833
1176.1 1890.6 983.1 700
18 250 24 17.9 2.800
10m 778.7 1187.6 781.8 550
16 200 22 18.2 2.750
8m J
515.4 743.0 629.0 450
14 180 18 17.8 2.500 3.3. So sanh vdi dam BTCT
Vdi npi luc ciia cae dam lien hpp thep-be tdng da tiiiet ke neii fa tiiiet ke bang dam BTCT thong fhudng thi ta ed ket qua so bd eho n h u ban sau (v&i gid thiei cae dSm BTCT thoa mdn TTGH2)
Npi luc Momen tai nhip Momen tai goi Luc cat
tai goi Dam BTCT
Bangs Nhip dam
L M+
M- Qmax Chieu cao tiet dien h
. Ket qua thiet ke d^
D o n .<*vi kN m kN
m kN mm
; 18m i . 2356.7 4102.6 1415.7 1500
m BTCT theo TTGHl vai cac dam da cho ,16.5m
1992.0 3356.2 1297.7 1200
15m 1666.6 2757.4 1180.7 1100
l^^J
1176.1 1890.6 983.1 1000
^^^S
778.7 1187.6 781.8
800 515.4 743.0 629.0 700
TAP CHi KHOA HOC VA CONG NGHE, Tmong Dai tioc Ktioa h{fc DH Hue Be rpng
tiet dien b Ty le: L/h Ty le: h/b
nun 500 12.0 3.000
500 13.8 2.400
450 13.6 2.444
400 12.5 2.500
TJp 9, So 1(2017) 350 12.5 2.286
300 11.4 2.333 Tu ket qua tren eho thay vdi eae nhip tii 12.5m trd len neii lam bang dam BTCT thdng fhudng Ihi kieh thude dam la Idn vol ham lupng cot thep Idn, anh hudng deh ehieu cao thdng thiiy eiia edng trinh. Qua trinh fhi cdng he van khudn chong dd he dam BTCT thdng thudng ciing se rat phiie tap vi trpng lupng be tdng Idn.
Bdng 10. Bang so sanh tiet dien giiia <3am lien hpp thep-be tong va dam BTCT voi cac dam co nfiip tii 8 d^n 18m
Npi li^c
Dam lien hpp
Nhip dam L Chieu cao tiet d i ^ h Be rong ban canh
b(
Ty le: L/h Ty le: hjb Dam BTCT
Chieu cao tiet dien h Be rpng tiet dien b Ty le: L/h Ty le: h/b
Don vi mm mm
mm mm
18m 1000 350 18.0 2.8 1500
500 12.0 3.0
16.5m 900 320 18.3 2.8 1200
500 13.8 2.4
15m 850 300 17.6 2.8 1100
450 13.6 2.4
12.5m 700 250 17.9 2.8 1000
400 12.5 2.5
10m 550 200 18.2 2.6 800 350 12.5 2.3
8m 450 180 17.8 2.5 700 300 11.4 2.3
4. KET LUAN
Tren co sd ngfuen cihi ly thuyet thu thap qua cae fai lieu, eac md hinh tinh toan ket hop vol sii dung eae chuong trinh iing dung. Qua kiem tra doi chieii giiia ket qua tinh toan tren cdng trinh da chpn, tac gia nhan dupe ket qua:
- Vdi edng trinh ed ket cau cd kich thude nhip Idn, cd yeu cau sii dung toi da ve khdng gian ki&i tnic fhi viee iing dung giai phap dam lien hpp thep-be tdng la mdt tromg nhimg giai phap ket eau phii hpp de dap iing yeu cau giam toi da chieu cao dam, tang chieu eao thdng thiiy eho cdng trinh.
- Do kef caii Uen hpp thep - be tdng da tan dung cac u u diem rieng biet ve dac trung CO ly giiia vat lieu thep va be tdng de fgo ra ket eau cd kha nang chiu luc Idn, dp tin cay eao eho edng trinh (vi vgt lieu thep cd dp tin cgy cao). So vdi giai phap dung
D'dm liin hap thep - bi tdng trong cdc cdng trinh vuat nhip tie 8m dm 18m
dam be tdng iing Ipfc trude thi giai phap dam lien hpp thep-be tdng d i thi cdng hon, cdng nghe thi cdng don gian, tiidi gian fhi cong nhanh hon vdi viec che tgo dam tgi nha xudng, ddng thdi hranh dupc nhiing nhupe diein ciia ket cau be tdng iing li^e trude nhu bi&i dgng Idn, niit...
- K^t qua tinh toan eiing eho thay ehieu eao dam khoang tii (l/15-^l/18)L (vdi L:
kich thude nhip) la phu hpp vdi cdng fhiie ve caii tao de chpn tiet dien sa bp ban dau dieunay giiip cho viee thiet ke kien fnic sat hon vdi tiliefkeket eau trong viee xac dinh kieh thude so bd ban dau ciia he dam Hen hpp thep-be tdng a i a edng trinh.
TAI LIEU THAM KHAO
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TAP CHI KHOA HOC VA CONG NGHE, Trucmg Dgi hoc Khoa hoc, DH Hug" Tap 9, So 1 (2017)
STEEL - C O N C R E T E C O M P O S I T E B E A M S I N B U I L D I N G S W I T H S P A N L E N G T H F R O M 8 m T O 1 8 m
N g u y e n Trong Vinh Faculty of Architecture, University of Sciences, H u e University Email: [email protected] ABSTRACT
U p to now, there have been a lot of structural solutions for the buildings which have long span beams such as: precast concrete, bubble deck slab, steel-concrete composite structures... It always h a s some advantages and disadvantages for each solution, thus the engineers m u s t choose the solution that is most suitable a n d effective for the building.
The aim of this research is to s t u d y the theoretical and calculation method of steel- concrete composite structures accordmg to Eurocode 4 for beams which have span length from 8m to 18m. From that results, we will have some suggestions and notices for the design of steel-concrete composite beams having span length from 8m to 18m.
Keywords: large span beams, steel-concrete composite beams, steel-concrete composite structures.
N g u y e n T r o n g V i n h sinh ngay 08/03/1982 tgi Thira Thien Hue. Nam 2005, ong tdt nghiep ky s u ng^nh Xay d u n g d a n d u n g va cong nghidp tai Trudng Dai hoc Bach khoa Da N l n g . Tu nam 2014 den nay, 6ng gi^ng day t?i T r u d n g Dai hoc Khoa hgc, Dai hpc Hue.
LTnh vuc nghiin cuu: Ket cau cong trinh.