Phan tich u'ng XLF cua ban ke bon canh be tong cot s a i thep chat lu'O'ng sieu cao dung cho cau nong thon Analysis ofthe behavior of ultra-high performance fiber reinforced concrete two way slab for footbridge
Ngay nhan bai: 24/10/2014 Ngay sCra bai: 5/11/2014 Ngay chap nhan dang: 15/1/2015
Tran Ba Viet, Le Minh Long, Nguyen Trung Hoa
TOM TAT:
Be tong cot sqi thep chat Iuong sieu cao la mpt Iogi vat lieu duqc danh gia cao bdi nhieu tinh nang hflu dung. Bii bao nay trinh bay mot so ket qui khao sat thUc i^hiem tren ban ke bon canh be tong cdt sOi thep chat tUdng sieu cao, ban ke bdn canh nay la mot modul cua ban mat cau dan sinh se diioc tiep tuc khao sat sau nay. Cac quan sat va phan tich t ^ trung vao:
quan h? tAi trgng va do vong; quan he tai trpng va bien dang; sd hinh thanh vet nift cua ban ke bon canh be tong cot soi thep chat l u o i ^ sieu cao.
T d khda: Be tong cot sdi thep cddng dp sieu cao, ban ke bdn canh, cau dan sinh.
ABSTRACT
The ultra-high performance fiber reinforced concrete is a material which is highly evaluated by its utihty. This paper presents the results of experiments on the ultra-high performance liber reinforced concrete slab.
This two ways slab is a part of the deck of a footbridge which will be prospectively investigated. Tthe survey and analysis focuses on: the load-deflection relationship;
load-deformation relationship; and the crack propagation of the ultra-high performance fiber reinforced concrete two way slab.
Keyword: The ultra-high performance fiber reinforced concrete, two way slab, footbridge.
TS. Tran Ba Viet TS. Le Minh Long
Vien khoa hpc cong nghe xay dUng DT: 0903.406501
Th.S Nguyin Trung Hoa Khoa Xay DUng - Dai hpc Vinh
1 . Dat van d e
Hien nay tren the gidi cung n h u d Viet Nam nhu cau xay dUng ngdy cang gia tang, cac cong trinh ngay c&ng co quy mo ldn, nSn doi h6l phai CO loai be tong tinh nang cao. D6i vdl Viet Nam do dac diem dja hlnh cung nhU sU phan bo cCia dan cU, nen viec xay dUng cac cau dan smh nong thon d nUdc ta ap dung cic loai be tong tinh nang cao can duac nghien cUu sau hon sao cho thfch hop vcri dieu kien Viet Nam. Cac loai be tong nay phai dim bao cac y^u c l u ky thuat nhU cudng do cao, d p d^o dai cao, 6n djnh kfch thudc, bam dfnh tot, khong phdn t i n g , khong taeh nudc, khong ran nut, chiu uon, chju cat, chiu keo Mot trong nhiimg loai be tdng dd la be tdng cudng d d sieu cao cdt soi thep, day la c6ng nghe duoc danh gia cao bdi nhUng tinh nang hUu dung nhu: tang khS nang chju keo, tfnh d^o dai cao, tang khii nSng chiu lUc va nSng cao tuoi tho ket cau.
Mac d i l cung cd mgt sd nghien cUu ve be tong cdt spi chat lUong sieu cao cho mdt vai
dang ket cau. Nhung cac chi tieu, tieu chuan thiet ke doi vdi ket cau dung bi tdng cdt sfli chat lucmg sieu cao con chua day du, nin viec nghi§n cUu sSu hon den Ung x f l cCia k^t cau dang bSn ISm m | t cau ndng thdn dUoc xem n h u la hudng nghien cUu cap b i c h hi§n nay
Bai nay gidl thi&u m o t so kit q u i thUc nghiem ve b i n ke b d n canh bi tdng cdt t h e p chat luong sieu cao dupc thifc nghidm tai Phdng t h i nghiem cdng trinh - Vien khoa hpc cdng n g h ^ x i y dung Viet Nam, vdi muc dich ung dung cho cau ndng t h d n Viet Nam.
Mau b i n ke bdn canh dUoc t h i nghidm la b i n ke bon canh b^ tdng cdt spi chSt lUOng sieii cao. Ttii nghiem tap trung k h i o s i t quan he gifla d p vong v l t l i t r p n g ; quan he gifla Ung suat va bien dang; sU hinh thanh vet nflt cua ban ke bdn canh. B i n ke bdn canh n i y la mdt modul c u a c l u dan sinh se duoc k h i o sit thifc nghiem sau n i y [ hlnh 1).
2. Vat li^u, mhti thf nghiem vi quy trinh t h i nghidm
2.1.Vdtlieu:
Hlnh 1 Cau t i i n i i n h bSng be tong c5t «rt cijang « s i e u cao da * i « Wen KHCK XD d i e lao.
114Bniv [ia« 4.201S
Bing 1: C3p phdi be tdng dung cho ban ke bdncanK
Bang 2 Dac trUng co ly cua mau che tao CP-OI
vat li^u
Cap phoi biin ke bcin canh M B - 0 1 :
CP-01 Xi mang (kg)
Cat nghien (kg) Cat trang (kg)
^ r o bay (kg) _ Silica Fume (kg) Phu_gia sifiu dio (kg) Nudc(kq) 1 Th6p
100 30 h 215
Ham lUcmg t h e p (3%) + V l t lieu: Sol thep;Xi mang. Cat, C i t nghiei Tro trSu; Phu gia sifiu d^o. Silica Fume; Nudc.
4- CSp phdl bfi t d n g d u n g cho b i n ke bon eanh be t o n g cot soi theo b l n g ( b i n g 1):
+ Oac trUng co ly cua mau che tao CP-01 theo b i n g ( b i n g 2).
+ Md dun d i n h d i : E E = 4 3 ( G M P a ) +Trong lUpng neng: v V = 2450 k g / m ' 2 J. Mdu thinghiem
- Mau thf nghifim gdm ban ke bdn canh be tong cdt sOi t h e p chat luong sieu cao-
+ Mau MB-01; Cd kfch thudc 2,0 x 1,25 x 0,042m; la tam dung be tdng cot sdi cd dam bao quanh tam, kich thudc dam 0,15 x 0,15m chay doc theo bifin b i n ke 4 canh, kich thudc phan tr6n cua b i n I I 1,7 x 0,95 x 0,042m ( h l n h 2).
Hmh 2. Bar ke bon canh be t b r g cot in\ Ihep chai luang sieu cao duct thir nghiem tai Vren KHCN XD.
2.3. Thiet bi vd quy trinh thinghiem -Thi nghiem cho ban ke bon canh dUOc thUc hien Iren he thdng gdi nhu hinh ve ( hinh 3) Tai trong dUOc tao ra bdi cac qua gang, trong luong 1 q u i gang nang 25kg Cac cap tai duoc dat tai c i c vj tri tren ban ke bdn canh nhu hinh ve IKinh 4), Cac thiet bi do co ban duoc dung cho thi nghiem n a y Cam bien do bien dang duoc B i n g 31 G i l tri dp vdng cua b i n ke bdn canh t
Mau t h f nghiem sau so ngay bao dUdng ( ngay)
1 3 7 28
CUoMg do chju nen (MPa)"
50 127 160 190
Cudng do chju keo khi uon (MPa)
22 35 45 50
C i f f A i g d d k t e true ti^p (MPa)
7,0 9,2 12,0 MWjfeferitna«aaB
H'inh 3: He thong goi gia taicho thinghiem cho b^nke bon canh be I6ng cot sai chat luong sieu cao B i n g 4 Ket qua do do vdng va bien dang tai cac vi trf b i n ke 4 canh Cap
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Tai trong chat len VLing t h f l tai (kg)
0 300 600 900 1200 1500 1800 2100 2400 2400 2100 1800 1500 1200 900 600 300 0
Thai gifl t i l (phflt) 0 10 10 10 10 10 10 10 10 1200
10 10 10 10 10 10 10 30
Chuyen vi tai c i c vi trf do (mm) D l (gdi)
0,00 -0,04 -0,05 -0,08 -0,10 -0,13 -0,15 -0,18 -0,20 -0,20 -0,20 -0,20 -0,18 -0,16 -0,15 -0,14 -0,12 -0,10
D2( Bung) 0.00 -0.05 -0.09 -0.14 -0,17 -0,22 -0,27 -0,30 -0,34 -0,35 -0,32 -0,29 -0,25 -0,19 -0,16 -0,11 -0,06 -0,01
D3 (gdi) 0,00 -0,01 -0,01 -0,03 -0,04 -0,04 -0,05 -0,06 -0,07 -0,07 -0.05 -0,04 -0,03 -0,02 -0,01 -0,01
•0,01 A O I
Bien dang tal c i c VI t r i do (ME) PI (nqanq)
0 5 13 19 24 32 38 45 48 50 46 40 36 30 25 17 14 6
P2 (doc)
0 3 6 8 10 12 15 16 17 19 IS 13 11 9 7 5 2 0
BP^
Cap t l i
•g theo p h l n
i m E t a b s B i n MB-01
B d vdng tal tiet dien gifla b l n ( mm) d p i
(300kg) 0,08
Cap 2 (600kg) 0,13
C l p 3 (900kg) 0,17
C5p4 (1200kg)
0,22 Cap 5 (1500kg)
0,26 C3p6 (1800kg)
0,30 Cap 7 (2100kg)
0,35 cap 8 (2400kg)
0,39 Ghi chu
m m m m m rn
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flng v a luc dat trfin b i n la 300kg d ^ n 2400kg.
D p vdng tai cap t l i 8 I I 0,34mm. Sau do luu t l i sau 20h t h i d d vong la 0 3 5 m m . Sd Hfiu thi nghiem the hien t r o n g b i n g 4. TU b i n g so lifiu ta CO ket q u i bieu do tai trong - D o vdng duOc the hien nhU hinh ve ( h i n h 4), bieu do tal trpng - bien dang dupc the hien n h u hinh ve (hlnh 5).
- Ban ke 4 canh MB-01 sau d d dUOC dUa v i o he t h d n g gia t l i thuy lUc v l gia t l i Ifin den t l i t r o n g 3 0 3 tan cd xuat hifin vet nijft
Hmh 4 Bteu flo quar he giifa 36 uong va tai trong.
L 1. L L L L
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i. 1. L L L L
-m ML.
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a s S13 H a
g Q Q Q Q g El E • • Q • B H H H H H
1 ' L ^
L h. £. i. 1. i.
L S. i. 1. 1. i.
71 ITl [71 iTl 171 IT
-m m-
jl H E H H B H j: B H E H E n j : 0 B B H B H
1
Hinh 4:Sddo cdc clp tji thinghiem cho bjnke bon canh dung de do bien dang be mat b i n kfi bdn canh;
tin hieu dUoc ghi n h i n qua thiet bj do. B d n g h d chuyen vi k^ dUpC xfl dung de do d d vong, dUcK b d t r i 6 day b i n ke bon canh. Qua trinh gia tai duoc thUc hien b i n g tay, mdi cap gia t l i 4 q u i gang, tong trong lUpng 100kg. CIc tm hien do duoc doc va ghi lai bdi ngUdi thi nghiem,
3. K^t q u i t h i n g h i e m va t h i o i u a n 3.1. t / n g xir eua tidn bi tdng tinh todn theo phdn mem Etabs 9.7 J
Kinh 5: Bieu do quan he giQa bien dang v^ Hi trpng.
- Ket l u l t k^t qua thi nghifim b i n kfi bdn canh MB-01
-I- Tai cdc cap t i l tU cap 1 den cap 8 tUcmg umg v c i lUc d i t tren b i n I I 300kg den 2400kg I l m viec tren mien dan hoi. D o vong tai c l p t l i 8 sau khi on djnh la 0,35mm, ban ke tidn canh khdng xuat hien vet nut. Sau khi ha t i l , b i n d i n hdi ve lai vi t r i ban d i u .
MoAcHfaiiin^rfPf
- Dung phan m e m Etabs 9.7 J nhap m d hinh cua he ket cau ban ke bfin canh vdi kich thudc 2x1,25x0,042m, nhap sd lieu d i e trUng cua v i t lieu be tdng cdt soi thep. Od vdng cua t ) l n kfi bdn canh dUoc ghi theo c i c cap t l i . Tal cac c l p tai do vdng cua b i n kfi 4 canh cd cac g i l tri nhU b i n g sau( b i n g 3 ) :
3 J. Kit qud thi nghiim Mn ki bon cgnh MB-01
- Tai cac cap tai t f l c l p 1 den cap 8 tucmg
liAitlitaicJptai8(2400k9)
1 1 6
B i n g 5: So s i n h d d vdng t?i cac cap t l i cua b i n ke theo c i c phUcfng phap ti'nh v l t h i nghiem
C l p tai
Dd vdng theo Etabs Od vdng theo t h i
nqhifim
B i n MB-01 B i n MB-01
Od vdng tai tiet dien gifla ban( mm) C a p l
(300kg) 0,08 0,05
C l p 2 {600kg) 0,13
Cap 3 (900kg) 0.17 0,09 0,14
C l p 4 Cap 5 (1200kg) (1500kg)
0,22 0,17
0,26 0,22
C l p 6 (1800kg)
0,30 0,27
C l p 7 (2100kg)
0,35 0,30
Caps (2400kg)
0,39 0,34
Ghi chu
Hinh 7: Ket thiic qua trinh gia tji ban he 4 canh 4 . Ket ( u l n
-TUcIc kit q u i tinh theo phan mem Etabs va kit q u i thf nghiem ta cd b i n g ket q u i ( b i n g 5):
- Vdi b i n MB-01. tai cap t i l 8( 2400kg) tam cdadvdngO,35mm, s a u k h i d d t l i . t l m g a n n h u ve trang t h l i ban dau. Sau khi cho vao he t h d n g gia t l i thCiy lUc, t i m chi xuat hien vet nUt tai tai trpng 30,5 tan.
- B i n ke 4 canh MB-01 d l y 42 m m cd k h i nang chiu t l i ldn, tai cap 8 (2400kg) t u o n g duong t i l 1470 kg/m2, tfnh c l t l i trong b i n t h i n I I 1569 kg/m2 gap g i n 5 lan so vdl tai trong thi^t ke cau danh cho ngUdI di b d (300 kg/m2). K h i n i n g chiu lUc cua t i m bfi tdng d l y 42 mm cdt sgi d i m b l o chiu lUc cho tam mat cau d i n sinh;
-Ddl vdi b i n k f i 4 c a n h MB-01 d l y 4 2 m m cd k h i n i n g chju t l i g i p 5 I l n t l i trong thiet ke cau d i n sinh, nfin cd the g i l m chieu day b i n xuong t f l 3 0 m m d e n 3 5 m m .
- K h i nang chiu t l i cua b i n bfi t d n g chat luong sieu cao - UHPSFC r i t tot, nhung de p h i t huy het k h i n i n g chju lUc cfla bfi tdng nay, can chip nh^n dd vdng cao hon be tdng t h d n g thudng. Vdi bfi t d n g thdng t h u d n g khi dat den Op vdng gidl h^n, bfi tdng se bi p h i buy, nhung vdl bfi t d n g LJHPSFC do vdng ldn nhUng b e t d n g v I n c h u a b i p h a h O y .
- Khi gia t l i b i n be t d n g chat luong sieu cao - UHPSFC, d d vdng cua b i n x l p xi vdi d p vdng khi tinh t o i n theo ly thuyet niu b i n I l m trong miin d i n hdi
- K h i nang chiu lUccfla b i n b f i t d n g cdt sol g i p k h o i n g 3 lan so vdl be tdng thudng cd cdt
•^thfip; So vdl d p t l i cho c l u ndng thdn 300 kg/
m^ vdi hfi sd 1,75 do vdng I I 0,14 mm, vuot yeu c5u thiel ke tinh toin.
T A I u e u T H A M KHAO
[1] - T i e u chuan 5574 2012 Ket d u b e l o n g va be tong cot t h e p - f i e u d i u a n T h i l t ke.
| 2 1 - T i e u (huan thiet ke cau 22TCN272-t)5.
[3] - Nguyen Tien Binh - Tran Bi Viet, Vai trb cua soi polypropylene trong viec lam giam bien dang m i m ciia be t6ng trong dieu luen khf hau nong am Vl§t Nam
|4] - Nguyen V i l t Trung, B l tfing cot stfi t h e p Nha x u l t bSn X i y Difng nam 2005.
[5] - T r a n Ba Viet, Nguyen Thanh Binh, Nghien ciiu b l tong cot art t h i p lam mat dUcmg ciUig, Tuyen tap b^o cao Hoi nghi khoa hoc - Ky niem 50 nam thanh lap Vien Khoa Hoc Cong N g h i Xay Dtmg (IBST), pp. 198-206,
[6) - Tran Ba Viet, L l Mmh Long, Nguyen Thanh Binh, Nguyen Hong Son, Ngo Manh Toan, Vu Ngoc Luyin va ck cong tac v i l n , N g h i i n cuu che tao muong thuy loi thanh mong due jjin b i n g b l tang cdt sen thep, Tuyen tap bao cao Hoi nghj khoa hot - Ky n i l m SO nam thanh lap Vien Khoa Hoc Cong Nghe Xay DUng (IBST), pp. 207-216.
[TJ-NguyenThanh Binh, Nguyen HuyenThI, Anh hi/Dngcda cUcmg do b l tong va Ioal soi t h i p den h i l u qua i i dung soi thep trong be long cdt soi t h i p
(8] - ACI 544.1R-96, State-of-tlie-Art Report on Fiber Reinforced Concrete.
19] - Trancois Toutlemonde, Jacques Respiendmo, Designing and Suiidmg w i t h UHPFRC - State-of-Art and Development,V^ley ine, 2011
