PHAN TiCH DO TIN CAY VE AN TOAN CONG TRJNH THUY LOI VIET NAM
Pham Hong Cudng', Nguyen Lan Hinmg', Nguyen Thi Huyen Trang
Tom tat: Tiip can v&i tieu chudn ki thudt cua cdc nu&c tien tiin vd dp dung nhirng phucmg phdp tinh hien dgi di ndng cao do chinh xdc cho cdc quyit dinh khi thiit ki cUng nhu qudn li chdt lugng cong trinh thiiy lai la mpt trong nhirng hu&ng nghien cuu lich cue trong linh vgc an toan cong irinh & Viit Nam hiin nay. Npi dung ciia bdi bdo alnh bdy cdch tiip can cua cong n-inh thuy lgi v&i thiit ki ngdu nhien & cdp dp U, ddng thai trinh bdy vi du img dung li thuyit dp tin cgy phdn tieh an todn cua cong lp thiin de ldm ro cdc vdn de cdn nghien cim. Cdc npi dung cua bdi bdo Id nhirng kit qud nghien cicu m&i vd la tdi liiu tham khdo hQu ich cho cdng tdc nghien cicu, ddnh gid an todn cho cdng trinh thiiy lai.
Tir khoa: An todn cong trinh thuy lgi, cdc su cd cua cdng lp ihien, dp tin cgy cua cong lp thien, phan tich dp tin cgy, thiit ki ngdu nhien.
1. Dat van de
Mdi cdng trinh la mdt h? thdng ket cau phue tap.
Trong qui trinh lam viec, cae hang myc cdng trinh la cae phan tir quan trgng trong he thdng va cd lien quan vdi nhau theo mgt logic. Thyc ta xay dyng va khai thac cdng trinh thiiy Igi cho thiy, khdng it he thong cong trinh bj sy cd vdi nhieu lydo khae nhau, trong do CO nhirng yau td khdng dugc xet den do hgn cha ciia cac phucmg phap tinh toan nan da gay ra nhifng ton that Idn ddi vdi san xuat, kinh ta, mdi trudng vi con ngirdi. Cho den nay, d Viet Nam, cic he thong cdng trinh dau mdi thiiy Igi da va dang dugc thiat ka theo pbuong phap truyan thdng, phuong phap thiet ke tat dinh. Phuang phap niy khdng dinh Iugng dugc mirc do anh hudng ciia tirng thanh phan dan an toan chung ciia he thdng. Vi vay ngudi thiet ke cung nhu ngudi quan Iy chua cd can cir chac chan da phan tich cic nhin td inh hudng den an toan cdng trinh, lam ca sd dua ra nhifng quyet dinh hgp li khi thiet ke cung nhu khi van hanh khai thac cdng trinh.
Tran tha gidi, ly thuyat ngau nhian dang dugc diing tuang ddi phd bian trong nhihig nghian ciru, tinb toin phan tich an toin h? thdng nhu he thdng pbdng lu, h? thdng edng trinh xiy dyng... Trong ITnh vyc cdng trinh xay dyng, nhieu nudc tien tien d chau Au, My, Nga, Trung Qudc vv... da dua ra nhifng tieu chuan an toan cdng trinh theo xac suit an toan cho phep hoac do tin cay an toan ciia edng trinh [2].
Cho dan nay, d Viet Nam, cic cdng trinh cung nhu cac h? thong thuy lgi da va dang dugc thiet kl theo phuang phap truyen thong (tilp can xic suit
Viin Khoa hpc Thiiy Ipi
^ Truang Dgi h^c Thuy lgi
cip dg 0). Trong kbi dd, bing chuc nam nay, ly thuyat do tin cay va tudi thg cdng trinh da dua vao chuang trinb giing dgy chinh ciia cic trudng dai hoc nhu: Dgi Hgc Bach Khoa, Dai Hgc Xay Dyng, Dai Hge Thuy Lgi... Mgt sd cic nghian ciiu mdi gan day ung dung li thuyet do tin cgy trong ITnh vyc thuy Igi Cling mdi dimg lgi d ket qua nghien cuu ctia cac lugn van tien sT va thac sT va cic vin dl nhu:
"Probabilistic Design of Coastal Flood Defences in Viet Nam - Thilt kl ngiu nhien he thdng pbong lii bd bien Vi?t Nam", [1]; "Nghien eiiru xay dyng phuang phap danh gia chit Iugng he thdng cong trinh thuy ndng theo ly thuylt dg tin ciy trong dieu ki?n Viet Nam", [3]; "Phan tich dn djnh ciia mdt so tuyan da thudc he thdng sdng Hdng va sdng Thai Binh", [3]; "77i/e/ ki xdc sudt vdphdn tich rui ro cho di sdng Dudng — Dong bdng chdu thd song Hong
Viit Nam", [3];"Nghien ciru dn dinh mai ddc de, dgp", [3]. Kat qui nghian ciru gin diy cita de tai doc lap cip nha nudc dl nghj img dung li thuyet do tin cay vi phin tich rui ro vio trong nghian cuu xac dinh dg tin cay vl an toan cbo cdng trinb xay dyng trong diau kien thian tai bat thudng, [7]. Hien nay tai Viet Nam cic de tii nghian ciru ve ly thuyet dp tin cay cho ITnh vyc tbiiy Igi thudng sti dyng mgt so phin mem cita Cbiu Au nbu BESTFIT: udc lugng bgp ly tdi da ham xic suit tbdng ka cbo bien ngau nhian tir sd lieu quan ttic, VAP: xtr ly bien ngau nbien va giii bim xac suit thdng ke; Vi?t Nam da co phin mem DTC2007 cua TS. Phgm Hong Cudng vdi ngi dung: danh gia chat Urgng h? tbdng cdng trinh thiiy ndng tbeo ly thuylt dg tin ciy. Nhu vgy trong nghien ciru eung nhu ttong thyc te ung dgng chiing ta cdn dang thieu cac phin mem de tinh toan cho cae cdng ttinh cung nhu cac h? thong cdng trinh
KHOA HOC Kf THUAT THUY Lpi VA Mfil TRlrtWC - S6 42 (9/2013)
thiiy lgi khic nhau.
Hi?n nay tai Vi?t Nam, trong tinh toan cdng trinh thiiy lgi dang su dyng bdn bgp cac pbuong phip:
phuong pbap ting suit cho phep, pbuong phip h? sd an toan va phuang phip trgng thai gidi han ciing vdi mo hinh tbiet ke truyen thdng. Theo md hinh thiat ke nay tii trgng vi dg bin tinh toan dugc mac dinb theo cic tieu chuan thiat ka bi?n banh trong sudt tbdi gian khai thic ciia cdng trinh. Nhung thyc te cic him tii ttgng vi dg ben chju tic dgng cua rit nhieu yeu td khic nhau va bien doi tbeo quy luit ngiu nhian. Vi vgy quan ni?m va quan be giifa tii trgng vi stjc chju tai ciia cdng trinh trong qui trinb Iim viec cita md hinh thiet ke truyan tbdng ngay cang trd nan lac hiu.
Xu hudng tien bg bien nay la thilt kl cdng trinh theo ly thuyet ngiu nhien va phan tich dg tin cay. Mtic dg tilp can vdi pbuong phap thiat ka bien dai nay bien dugc chia ra d cic cap dg khic nhau:
- Tiep can mirc do xic suit cap dg 0, thiat ka truyen thong, sii dyng phuang phap he sd an toan.
- Tilp can muc dg xae suit cip dd I, thiet ke ban xae suit, sir dung phuang phip nhieu b? so an toan (phuang phip ttgng thii gidi ban).
- Tilp can xic suat cip do II va cap dg III, phuang pbap tiep can ngau nhian.
Mite dg III, trong dd cae ham phan bo ciia cac bien dugc giit nguyan quy lugt phan bd va cae tinh toan klidng su dyng cic phucmg phip gin dung. Cap dp II, trong do su dung cic phuang phip gin dung de biln doi luat phan bd etia cae tai trgng va siic chju tai ve cic him phan bd chuin, cic tinh toan sir dung cac phuang pbap xae suit gin dting.
Bai bao nay trinb bay mdt sd kit qua phin tich an toan cua cong Ig thian tiep can vdi ly thuyet ngau nhien d cip dg II Iam ca sd thiet lap bii toan phin tich dg tin cgy an toan cho cic cdng trinh thuy lgi d Vi?t Nam.
2. Bai toan cap do II ve do tin cay an toan cong trinh.
Vdi quan niem cdng trinh bj mat an toin (xay ra sy co), ttong trudng bgp tai trgng vi cae tac dgng (S) vao edng trinb vugt qua khi nang chiu tai thiet ke (R), ho$c tai ttgng va tie dgng nim trong gidi ban thiet ke nhung sue chju tii eua cdng trinh da bj suy giim, trong tinh toin thiet Igp dugc him tin ciy (Z).
Z = R~S (I)
Trong do sue chju tii R v i tii trgng tie dyng S la cic him so ciia cic dgi lugng nglu nhian cd luit phan phoi xac djnh. Tbeo biiu thtic (1) bam Z dugc
qui udc nhu sau: Z < 0 cdng trinh khdng thda man dieu ki?n an toan; Z > 0, cdng ttinh thda man dieu kien an toan; Z = 0 la ranh gidi giifa viing an toin va viing khdng an toin (xem hinb 1).
Ham tin ciy Z cd tba la ham tuyen tinh cd cic biln ngau nbian phan phdi chuan; Z la him phi tuyan vdi cac bien ngau nhien phin phdi chuan; Z: la ham phi tuyen vdi cac bien ngiu nhian co luit phan phdi bat ky
^2(R) i Z =0 Bien giifa VLing an toan va vung khong an toan i
z <0 Viing khong an toan
\ /
v '
Z >0 Viing an toan
^ X,(S) Hinh 1: Mo phong bien sg cd.
Cdc bu&c tim xdc sunt cda bam tin cay nhu sau 16]:
Thanh lap ham tin cay Z.
Biln dai cic bien ngau nhien (BNN) ciia ham Z cd luat phan phoi (PP) bit ky ve lugt phan phdi chuan. Xac djnh ky vpng (/i^J va dp l?ch chuan (O"^,) ciia cac BNN dd :
1
ii(^.-
(3)\{n-\)
Khai triln Taylor doi vdi ham Z va sir dung 2 biiu tbirc diu ciia da thtic nay. Ham Z duge tuyen tinh hda tai dilm thiet kl (DTK) ban dau:
X\Xl,X\,Xl,..); (4) trong dd: X° = p^i ' ^^'
z-z(x,).t'^^-(^.-K ((•)
trong do: ky vgng ban dau ciia him Z tinh theo (7) va dp l?ch chuin ban diu cita him Z tinh theo (8)
KHOA HQC Kf THUAT THUY Lgi VA MOI TRUftNC • S6 42 (9/2013)
S( sz{x„)
dX, •y^Y Tinh dg tin cay: p = — ; va xae suit hu bdng: -^/z^o) ~ ! ^ { ~ ^ ) ' Tinh ha sd inh budng:SX, "'
(8)
(9) (10)
(11) Xac djnh toa dO DTK mai:
X-(X,,X,,X,...): (12) trong dd:
X^ =p^^+a,.j3.cF^, , (13) Tinh lap da tim diam thiat ka va cic dac trung
thdng ke ciia ham Z. Qua trinh lap Avtac md t i tran sa do hinh 2, budc lap ehi dimg lgi khi diem thiat ka hgi ty.
DTK: la diam nam tran dudng bian giifa viing an toan va viing khdng an toan ma tgi do mat do phin phdi xac suit ciia ham tin cay Z li Idn nhit. Sir dung ket qui DTK cudi cimg (da hdi tu) de tinh cac dac trung thdng ke cita ham Z, tir do xic djnh dugc xae suat xay ra sy ed Pi2.<fi) •
3. iTng dung ly thuyet do tin cay danh gia on dinh cho mgt hinh thirc cdng trinh thuy loi: cong lo thien.
3.1 Gi&i thieu ve cong lp thien.
Cdng Id thien la mgt loai cdng trinh thuy lgi duge sir dung phd bien trong cac h? thdng tudi, tieu, phong lu, ngan trieu...Cdng thudng cd chiau rpng kha Idn, nan dugc chia ra thanh cac khoang. Cae edng da dugc xay dyng hoac chuin hi xiy dyng d nudc ta cd chieu rdng klioang tir mdt vai met din hing chuc met. Cae cdng lay nude, tudi, tiau hoac cdng diau tiat trong he thdng kenh cd chiau rdng khoang thudng tir Im den 10m. Cac cdng xiy dyng tran sdng lam nhiem vu dieu tiet ddng chay, nhit la cac cdng ngin man dugc xay dyng gin cira sdng nhu edng Dd Di?m, cdng Thao Long, cong Nghi Quang..., mdt sd cdng dang duge thiet ka trong he thdng chdng ngap thanh phd Ho Chi Minh nhu: cdng Thit Bg, cdng Muong Chudi..., phii thda man dilu ki?n giao thdng thuy nen chiau rgng mdi khoang cita cae edng nay dugc thiet ke tir 30m den 60m. Chiiu siu cgt nudc d cic cdng xay dung tren h? thdng tudi
tieu khoing tu Im den 10m, d cac cong xay dyng tren sdng khoang tir 5m din 15m. So vdi cdt nuoc a cac dgp tgo thinh ho cbiia tbi cic cong hd chju c^t nudc thap ban, vi vgy kbi phin logi tbeo cgt nudc cdng hd cdn dugc ggi li cdng trinh cgt nudc thip.
Cac bg phgn ctia cdng lien ket vdi nhau thanh mgt he tbdng kit ciu. Trong tbyc te, cdng Ig thien dugc xiy dyng ca tran nen da v i nen dit. Cdng chju tic dgng ciia nhieu tii trgng, trong dd cic tii trgng tir moi trucmg nudc va cac tai trgng phit sinh tu moi trudng nen la cic tii ttgng cd dien bien phiic tgp.
Cung nhu mgt sd cae cdng trinb ding nude khae, sy lam viec ciia cdng hd la qua trinb tuang tic giifa ba mdi trudng nudc, nen vi cdng. Danh gia an toin ciia cdng li xet sy can bing giifa siic chju tii vi tii ttgng tie dyng, ttong dd cic yeu td tgo nan sue chiu tii va tai trgng bao gdm c i eac yeu td tat dinb vi yeu to ngau nbien. Miic dg chinh xae ciia cae kit lugn vl an toin cua cdng phy thudc rat nhiau vao mue do xet dan tinh ngiu nhien cua cic yeu td tao thinh sire chiu tai va tai trgng cua cic phuang phip dugc lya chgn de tinh toan.
3.2 Cdc ca che phd hogi cua cdng Ig ihien Cdng Id tbien bi su cd cd the xuit phat tir mpt nguyen nhin hoac nhiau nguyen nhan mdc ndi vdi nhau. Cac ket qua phan tich ca hgc v i cac nghien ciru tdng kat trong thyc tian da dua cae quy djnh ve ca che phi hoai dian binb v i cic dieu kien da dam bao an toin cbo cdng vao trong eac tieu chuan kT thuat thilt kl edng Ig tbien. Tren ca sd phan tieh d?ic diam lim viec eua cdng va dua tbeo tieu chuin thilt ka cdng Id thien hi?n hanh ed tba thiat lap dugc so do ciy sy ed nhu hinb 3.
S u e d cdng 16 thien
ho3c |ho3c |ho3c IhoSc Mat on dinh
ddng chay
Mat on dinh tdng the
Mat dn dinh ket cau
Cacsy cd khac
IhoSc [hoac |hnSr, \hn!ir: \ha&C Cong bi
lat
cdng bj tragi
Nen cdng khong di!i kha nSng chju tai
cdng bi day ndi
cdng bj lun
Hinh 2: Sa do cdy su co ciia cong lp thien 3.3. Hdm tin cgy cua cdc ca che phd hogi Cd rit nhiau nguyan nhan din dan sy ed cong Ig thien nhung trong bii bao nay tic gii chi de cgp den 3 nguyen nhin lam mat dn dinh tdng the cong va xay dyng ham tin ciy cho 3 ca che pha hogi nay: cong h\
trugt, cdng bi lit, nen eong khdng du kha nang chju tii.
KHOA Hpc K? T H U A T THUY LQI VA M O I ^R\I<mC - S6 42 (9/2013)
(1) Cong bf tnrgt phdng
Cong cd the bj trugt phing qua mit tilp giip giifa phin chan kbay ciia day cong v i dit nin. Ham tin cgy cua co che trugt phing nbu sau:
Trong do:
2_^F^ '• tong cae lyc chdng trugt;
2_^fg,: tdng cic lyc gay trugt.
Cic lyc chong trugt v i giy trugt dugc xic djnh tren ca sd phin tich tit ca cic luc tic dung len bin day cong.
Cing lam vi?c an toan khi i|2i<o) "^ \ Bf\
Trong ddi i^M xic suit sy cd cbo phep cita ca che mit on djnh trugt phang.
(2) cdng bf lat
Trong qua trinb lam viec cong bj cd tha bj lit quanh mgt true d chin mdng ha luu. Ham tin cay cua ca cha lat nhu sau:
Trong dd: ^M^,; "^M^, : tdng mdmen chdng Igt va giy lit lay vdi true chin mdng ha luu.
Cdng Iam vi?c an toan khi P,^2<(i] *^ K/M Trong dd P, xic suit sy cd cho phep cua ca che mat dn djnh Igt.
(3) Nen cong khdng dii khd ndng chju ldi Lfng suit Idn nhit ma cdng phai chiu thudng xuat hi?n tgi chin mdng thugng luu hogc hg luu cua cdng.
Khi ting suat trung binh tai chan mdng vugt qui khi nang chiu tii eua nan edng thi nen cdng bj pha hoai.
Trong dd:
R : sire chju tii ciia dat nan;
o"j.g ; irng suat trung binh ciia mdng eong.
Nen cong du khi ning chiu tii khi
V.)<[^/]
Trong dd \ Pf\ xac suit sy cd cho phep ciia ea che mat on djnh: nin cong kbdng dii khi nang chiu tii.
3.4 Xdc sudt su co cua cdng lp thien So do cay sy cd ciia cong Ig thien nhu d hinh 3, cic CO che sy co xiy ra la dgc Igp va cd quan h? vdi nhau trong mgt h? thong noi tiep. Ham tin cgy Z dugc tinh toin d cap dg II nen xic suit sy cd ctia
cdng la Py dugc tinh theo cdng thiic bien rgng:
max[/';(z,<o)]<p/<2:[p;(z,<o)]
Trong dd:
Py (Z, < O) : xac suit sy ed ctia ca chi thir i.
3.5 Vidu iinh dp tin cgy cua cong lp ihien Nam Ddn.
Da lam rd cic van da da ttinh biy d tran, trong phan nay trinb bay vi du bing sd vdi cic s6 lieu thu thip dugc d cdng Id thien Nam Dan - tinh Ngh? An.
Cic tinh toan duge thyc hien theo ba phuang phap:
he s6 an toin, ttang thai gidi han (TTGH) vi Iy thuylt dp tin cay (LTDTC).
3.5.1 Gi&i thieu mpt phuang dn tham kbdo trong thiet ki cdng lp thien Nam Ddn (phirang dn chua xir ly nin)
Cdng thupc loai cdng trinh cap 11 dugc xay dyng d bd ti sdng Lam thudc dja ban xa Xuan Hoa huy?n Nam Dan, tinh Nghe An. Day Ii cdng lay nudc Ig thien co luu lugng thiat ke Q,!^ = 27,64 mVs, cdng gom 3 khoang mdi khoang rpng 5m ddng md bang cira van phang, thin cdng dai 28,0m, phia sau van cd tudng ngyc cao 9,45m. Tren dinh cdng co bd tri cau giao thdng, eau cdng tac, cau tha phai va cac thiet bj chuyen dung khac.
3.5.2 Cdc so liiu linh lodn.
- Trudng bgp tinh toin: Chenh l?ch myc nudc thugng ha Iuu Idn nhat, cdng ddng.
- Sir d^mg phan mem BESTFIT de tim luit phan phdi xac suit thyc nglii?m va cae dSc trung thdng ka (p, cr) cita cac BNN nhu bang 1.
Bdng I: Cdc BNN su dung trong linh todn
Ten cac BNN
Dung irong kho ciia dai nen
Goc ma sat irong cua dat nen
Lvc dinh dcm vi ciia dat nen
Dung Irgng cua be long Ky hie
Vt
IP
c
Tb.
e^v,
KN/m'
do
KN/m^
KN/m' Lugt phan
ph6i cua cac BNN Phan Phoj
Phan Phoi
Phan Phoi
Phan Phoi chuin
11
18,5
18
12,51
25
»
0,92
DM
0,8K
1,1''
3.5.3 Cdc tham sd cho phep theo tieu chudn Eurocode vd tiiu chudn Viit Nam
KHOA HQC Kf THU^T THUY LQI VA MOI TRUONC - S6 42 (9/2013)
^Ml^i^^^
3.5.4 Ket qud tinh todn - Tinh toan on djnh cac ca che sy cd theo 3 pbuong phip khic nhau: h?
sd an toan, trgng thai gidi hgn va phucmg phip tinh tbeo dg tin ciy. Sii dung phin mem VAP (Variables Processor): de tinh toan xic suit sy cd ciia cae ca che phi hoai theo phuang phap tinh tbeo dg tin ciy. Ket qua nhu bing 3.
Ky hieu; (1): Cdng bj trugt phang;
(2): Cdng bj lit; (3): Nan cdng khdng dii khi nang chju tii.
3.5.5. Ddnh gid kit qud Kat qui tinh theo tieu chuan hi?n banh eiia Viet Nam, trong do sir dung phuang phap b? sd an toin vi phuang phap trgng thii gidi hgn cho kat qua thda man cic dieu kien dn dinb.
Ket qui tinh theo phuang phap thiet ke ngau nhien: xac suit iiy tiau chuan an toin theo Eurocode thi pbuong an thilt kl nau d so do hinh 3 khdng dam bao dilu ki?n on djnh.
Hinh 3: Sa do cdng Nam Ddn dung trong tinh todn Bdng 2: Cdc gid tri cho phep Iheo tieu chudn Viit Nam vd Eurocode
. - . . .
['•;]
1.10''
[<",]
6.10""
[^;]
3.10-*
[^n
i.io-"
Tieu chuan Vi?t Nam.
PhuoTig phdp he so an toan [K,l
1,2
[KJ 1,2
Phucmg phdp TTGH
,.^-J-^
1,2
w=^
1,2 Bang 3: Kit qud linh todn dn dmh cong theo 3 phuang phdp
Ciic CO che sy
CO (1) (2) (3)
Kit luan
Cac phuong phap tinh toSn:
H? so an toan K,= l,69 K | = l , 8 1 (T„ = l04,8l(A'A'/m') - Cong khong bj ttucrt.
• Cong khong bi lat.
• Nen dli kha nSng chju tai
TTGH K , - l , 5 7 K | = l , 7 8 (T^i,=96,2Z(KNIm')
• Cong khong bi truoi.
• Cong khono bi lat.
• Nen dli kha n^ng chju tai
LTDTC PrzKOi - 0,628
P(Z2<0I ^ 0 P(Z3<i) = 0,0154
• Cdng cd khS nSng bj IruQl
• Cong khong bi lat.
- Nen cong khong dii k h i nang chju tii..
P'f = 0,628
Cd kha nSng cong bj mat on
djnh
4. Ket luan
Tuy cdn bi ban cha d mtic dg tiep can vdi phan tich ngiu nhian d cip dp II, cac tinh toin da trinh biy trong bii bio, da dua ra dugc thuat toin dt tinh xae suat sy cd va cac yeu td anh hudng den an toan cdng trinh.
Bai bao da trinb bay mgt vi dy danh gia an toan cdng Ig thian Nam Din theo 3 phuang phip: phuang phap h? sd an toan va trgng tbii gidi hgn (sir dyng cac tieu chuin cua Vi?t Nam), phuang phap tinh theo dp tin cay (su dyng cac tieu chuan Eurocode ciia Chau Au); cho thiy yeu ciu ve on djnh cong trinh tbeo tieu KHOA HOC K? THUAT THOY LQI VA HOI TRlrtUG - S(5 42 (9/2013)
chuan Eurocode cua Chau Au cao ban so vdi tieu chuan kl thugt cua cic nudc tien tiln la mdt trong chuan Vi?t Nam. Tuy nhien cic kit qua tren chi la nh&ng budng tich cyc hien nay trong Imh vyc an tham khio vi dg tm ciy ve cac tai li?u diing trong tinh toan edng trinh d nude ta. Tuy nhian dl phat triln toan d mgt mirc dg nhit djnh. Sa dd tinh la sa dd ciia dugc ly thuyat nay d nudc ta cin phii tiln hanh mdt phuong an tham khao, mgt sd sai sd ngiu nhien chua sd nghian cuu nbu: luu trir du lieu trong xay dyng va cd diy dii tai Ii?u tbdng ke cdn phai gji djnh. trong quan trie, xay dyng cac phin mim chuyen Nghien cuu ung dung vi phit trian cic phuang dyng cho cic bii toin cdng trinh ciing nbu be thong pbap tinh toin hi?n dai va tilp can vdi cae tieu cdng trinh
TAI LIEU THAM KHAO
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Summary
RELIABILITY ANALYSIS OF HYDRAULIC STRUCTURE SAFETY IN VIETNAM Approaching to the technical standards of developed counaies and applying the modern methods of calculation to improve the accuracy ofthe design decisions as well as lo manage the quality of hydraulic structure is one ofthe advanced research directions in the field of hydraulic structure Safety in Vietnam today. The main content of this paper is lo analyze the probability of hydraulic structure safety according lo the stochastic theory - level //. and application examples presented theoretical analysis ofthe reliability and safety sluices to clarify the issues lo research organizations This paper includes ihe results of the last studies and can be considered to be the reference for research in the field of hydraulic slrueture safely
Keywords: hydraulic structure safety, failures sluice, reliability of sluice, reliability analysis iprobabilistlc design.
Ngu&i phdn biin: PGS. TS. Nguyen Quang Himg
KHOA HOC K? THUAT THUY LQI VA MOI JRVtiHG - S6 42 (9/2013)
BBT nhgn bdi: 21/7/2013 Phdn biin xong: 23/8/2013
