KHAO SAT - THI^T Kt XAY DU-NG
MOT S6 THAY D 6 | CHU YEU TRONG Dif THAO TIEU C H U A N
THI^T KE KHANG C H A N M O I CCIA VIET NAM TCVN
"XAYDl/NG CONG TRINH TRONG VUNG DONG DAT"
rs. Cao Duy Khoi Vi$n KHCN Xay dtjng
TOM T A T : B^ng <3at la t^c dgng quan trgng can ki aSn khi thiSt kS nha va cong trinh. Tneac nam 2006, Vi$t Nam chira c6 Tieu chuan thiSt ke khang chin chinh thiK. T(r 2006, Tieu chuan TCXDVN 375:2006 (nay la TCVN 9386:2012) soan thao tren co so Eumcode 8 da dwac ban hanh. Ngoai ra ky sw thiet ke CO the su- dicing cac Tieu chain khang chin khac cua nuuc ngocti nhw UBC 97, IBC... Tuy nhien cac tiSu chuan thiSt ke chong dgng dit cua phieang Tay va cua Vi4t Nam khong hoan toan tuung thich do /i# thong tieu chuin thiit ke kit ciu cua Viet Nam chu yeu dira theo cic tieu chuin cOa Nga. Do do, vi$c bien soan mQt Tieu chuin thiet ke khang chin cua Vi$t Nam tren ca so Tieu chuan m6i cua Nga SP 14.13330.2011 ia can thiet. Bai bao nay dS cap din va phan tich mot so thay dSi quan trgng trong Tieu chuin Nga SP 14.13330.2011 vii di/ thao TCVN "Xay di/ng cong trinh trong vung dgng daf so vai cac phien ban Tieu chuin khang chin cu cua Nga (SNIP li-7-81*).
1.D|tvan de
MOt \hif\ gian dai a Vi#t Nam, tuy chu-a du-g-c cong nhgn chfnh thii-c, nhu'ng Tieu chuin xay dyng trong vung c6 dpng (Jat cua Lien X6 cu (SNiP il-7-81 va sau nay Id SNIP 11-7-81*) da du'O'c ap dgng rpng rai khi thi4t ke cac cong trinh c6 yeu cSu chong dpng dat.
Tu" khi hpi nh?ip, cac nha dau tu", tu' van nu-dc ngoai da su- dyng cac tieu chuan cua phu'ong Tay nhu- ASSHTO, ACI, ASCE, UBC cua My, Eurocode cua chau Au khi tham gia xay dg'ng cac cong trinh d nude ta. Mae du vgy, nhieu cong trinh khac vin su- dyng Tieu chuan Nga de thiet k4 chong dpng dat.
Ngoai ra, Ti§u chuan thiet ke nha cao tang TCXD 198:1997, phan khSng chin du'pc bien scan dya tren SNiPII-7-8i:
C^c ti§u chuan thiit k i chong dpng dat cua phu'ong Tay va cua Vipt Nam khong hoSn toan tu-ong thich (Tieu chuan Tai trpng va tac dpng TCVN 2737:1995, Thiit k i k i t cau BT va BTCT TCVN 5574:2012, Thiit k i k i t cau thep TCVN 5575:2012, Thiit k i kit cau gaeh da TCVN 5573:1991...), do hp thong tieu chuin nay cua Viet Nam chu yiu dya theo c^e tieu chuin cua Nga.
D i dap Cmg dupe thyc t i xSy dyng ngay nay, vipc bien sogn TiSu chuin thiit k i ching dOng dat cua Vipt Nam tren co so Tieu chuan Nga SP 14.13330.2011 Xay di/ng trong vung c6 dgng dit (Cmpoumenbcmeo e ceucMU^ecKux pauoHax.
AKmyanu3upoeaHHaf> pedaKU/ufi SNIP 11-7-81*) la can thiit. Day la d i tai cap Bp, do GS.TSKH. Nguyin Van Lien la chu nhipm va tac gia bai bao nay la thanh vien nhom bien soan. Tpi thoi diem nay, Dy thao TCVN "Xay dyng cong trinh trong vCing dpng dit" da thong qua Hpi d6ng nghipm thu cap co so.
Myc tieu cua bai bao nay la nghien CLPU mot so thay doi chO y i u trong phien ban Tieu chuan mdi so vfri cSe phien ban Tieu chuin cu (SNIP 11-7-81 va SNIP 11-7-81*) v i n da quen thuOc vdi nhieu ky su" thiit k i Vipt Nam, d i ngu-oi thiit Ki c6 t h i nam bit du-pc tinh than cua dy thao TCVN "Xay di^ng cong trinh trong vung d^ng dit" c6 the se du-oe ban hanh chinh thipc trong tu'ong lai.
D I thuan tipn cho vipc so sSnh, trong bai bao nSy cym tie "Tieu chuan cu" du'pc hiiu lei SNIP 11-7-81 va SNIP 11-7-81*, "Tieu chuan m&\" du-pc hieu la SP 14.13330.2011 hoac Di/ thao TCVN "Xay di/ng cong trinh trong vCing dgng dit".
2. Gioi tliieu Dir thao TCVN "Xay dimg cong trinh trong vung dgng dat"
Nhu' da noi, dy thao TCVN 'Xay di/ng cong trinh trong vCing dgng dit" du'pc bien soan dya theo Ti§u chuan Nga SP 14.13330.2011 phien ban nam 2011.
Dy thao c6 9 phin va 3 phy lye, cu t h i la:
1. Pham viap dyng 2. Tai li$u vipn din 3. Thuat ngu' va djnh nghTa 4. Quy djnh chung 5. Tai trpng tinh toan
6. Nha va cong trinh (nha 6, cong cong va cong nghi$p)
7. Cong trinh giao thong 8. Cong trinh thuy eong 9. Cac giai phap ehing chay
KHAO SAT - THltT Kt XAY DU-NG
Phy luc A (quy djnh) Bang phan viing dpng dat theo dja danh hanh chinh
Phy lye B (tham khao) Cac thang dpng dat Phy luc C (quy djnh) Ban do phan vung cap chin dpng va PGA lanh tho Vipt Nam
Cau true cua dy thao v i co ban giy nguyen nhu tieu chuan goe (9 phan chinh) [6], chi thay doi cac phy lye. Trong 3 phy luc cua TCVN, phy luc A va C la dieu kien ty nhien cua Viet Nam ve dpng dat, do do no c6 tinh quy djnh niu su" dung tieu chuan nay. Phy luc B de cap chu yeu thang dpng dat MSK-64, d i lam ro hon ve cip dpng dit su dyng trong tieu chuan. Phy lye B chl mang tinh tham khao, khong c6 trong ban tieu chuin goe va dupe trich d i n nguyen van tCf Thuyet minh ban do phan vijng dpng dat lanh tho Vipt Nam cua Vien Vat ly dja cau.
Tieu chuan nay ap dyng trong ITnh vyc thiet k i nha va cong trinh xay dyng trong vung dpng dat c i p 7, cip 8 va cap 9 theo thang MSK-64.
Tieu chuan su" dyng 03 ban do A, B, C vol chu kjf lap lin lypt la 500 nam, 1000 nam va 5000 nam tren nen dat loai II (hay eon gpi la nen trung binh -theo bang 1 - Phan loal dit nen eija Dy thao). Trong do ban do A (500 nam) - cho cac cong trinh co tarn quan trpng binh thuong va thip (xay dyng hang loat); Ban do B (1000 nam) va C (5000 nam) - cho cac cong trinh co tam quan trpng nang cao (cac cong trinh dac biet nguy hiim, phuc tap ve ky thuat hoac cac cong trinh dac thu).
Tai trpng dpng d i t tac dyng len cong trinh dupe tinh toSn theo cac hudng din trong phin 4 va 5.
Phuong phap cot loi la phuong phap pho phan ung ap dyng cho mo hinh tinh toan khong gian. Tai trpng dpng dit dupe xac djnh ung voi tCrng chu ky dao dpng rieng cin k i din, sau do hp qua cua chung dupe to hpp dudi dang can binh phuong bac 2 (SRSS) hoac to hpp binh phuong day du (CQC), tuong ty nhu Eurocode 8. Mo hlnh don gian dang cong xon v&\ cac khoi lupng tap trung va ehi xet den 1 dang dao dpng rieng dau tien (nhu phuong phap tmh lye ngang tuong duong trong Eurocode 8) ehi co t h i ap dyng vol nhCrng dieu kien tuong dii ngat ngheo trong thye t i (T, s 0,4s tuong duong nha 4 ting tro xuong, mat bang don gian). Chi tiit ve each tinh toan tai trpng dpng dat se dupe trinh bay trong mpt nghien cuu khac va e6 t h i cong b6 tiip theo bai bao nay.
C^c phan 6 - 8 di sau v i cac giai phap kit ciu va yeu c i u c i u tao khang chin doi vol cong trinh dan dyng, cong trinh giao thong va cong trinh thuy cong.
Ve CO ban, npi dung cua Tieu chuin goe dupe giu nguyen, chi logi bo cac diiu co lien quan din dieu kien ty nhign khong co a Viet Nam (nhipt dp am, anh huong cua bang tan, nen d i t bang vTnh cuu...). Do do, tinh dong bp vol cac Tieu chuan thiet k i khac cCia Viet Nam (TCVN 5573, 5574, 5575 ...) dupe dam bSo do cung dya tren hp thong Tieu chuin Nga. Cac npi dung chinh cua Dy thao TCVN "Xay dung c6ng trinh trong vung dgng dit" da dupe tom lupc trong [2], vi v$y trong bai bao nay ehi gidi thipu so lupc, va tgp trung di sau vao phan tich mpt so diem moi cua Dy thao nay.
3. Mpt so thay doi chu yeu cua Tieu chuan thiet ke khang chan mdi
So vdi cac phien ban Tieu chuin cu {SNIP 11-7-81 va SNIP 11-7-81*) von da quen thupe vol nhieu ky su thiet k i Vipt Nam, Tieu chuin thiet k i ehing dpng dat moi cua Nga co nhieu thay doi dang ke, t h i hipn tinh hpi nhap vol Quoc t i va cap nhat nhung diim moi trong tinh toan, cau tao k i t cau cong trinh ehing dpng dat. Vi vay ngay trong ten cua Tieu chuan gic da gpi phiSn ban mori nhat ndy la phien ban soat x^t cip thiet cua SNIP 11-7-81* (AKmyanusupoeaHHaf) pedaKU/ja SNIP 11-7-81*).
Nhung thay d i i chu y i u bao gom:
3.1. Ban do phan vung dgng dat
D i n truoc thdi diim bien soan tieu chuan nay, Vipt Nam CO hai hp thong ban do phan viJng dpng dat la:
Trong phy lye 2.8 cua bp Quy chuin xay dyng Vipt Nam 1997 [4] co cac ban do phan vung dpng dat theo cip vol chu ky lap 200 nam, 500 nam va 1000 nam. Chua co bang phan vung dja danh h&nh chinh trong phy lye nay.
Trong Quy chuin Vipt Nam 02/2009-BXD So lieu dieu ki$n tie nhien dung trong xay di/ng [5], co ban do phan vung dpng d i t theo dinh gia toe nen tren nen da goe, vol chu ky lap 500 nam, va bang ph&n vung dpng d i t theo dja danh hanh chinh. Bang nay cung ei^Q/c dinh kern voi TCXDVN 375:2006 Thiet ke cong trinh trong vung dgng dit, nay la TCVN 9386:2012.
Ca hai hp thong ban do tren deu khong thich hpp d i sCI' dyng kem voi dy thao TCVN nSy, vi tieu ehuan goe [6] phan chia dpng d i t theo c i p dya tr§n thang dpng dit MSK-64 va su dyng 03 ban do phan vung dpng dat vol chu kjr lap 500 nam, 1000 nam va 5000 nam. Do d6, can co ban d i phan vung dpng dat theo cip cua Vipt Nam vol cac chu ky lap tren.
T^p chi KHCN Xay dung - so 1/2014
KHAO SAT - THI^T K t XAY DLCNG De dap ling yeu cau do, Vien Vat ly dja cau da
tien hanh nghien cuu, d i xuit moi 03 ban d i vol cac ehu ky lap 500 nam, 1000 nam va 5000 nam. Tren co so 03 ban do, Vpn Vat ly dia cau da lap cac bang phan vung dpng d i t theo dja danh hanh chinh din cap quan, huypn, rit tien Ipi cho cac ky su thiet k i SLP dung. Dy thSo cac ban do tren dupe dinh kem trong Dy thao TCVN [1]. Nhung phan tich dudi day dupe dua ra tren co so dy thSo nay.
Theo thuyit minh ban d i do Vipn vat ly dia elu lap, thi cac ban do nay dupe xay dyng nhu sau:
- DO' lipu d i u vao v i dpng dit: cae vung nguon phat sinh dpng d i t d Viet Nam,
- Tu cae viJng nguon tren, su dung phuong trinh t i t d i n dao dpng cua Nguyin Dinh Xuyen va Trin Thj My Thanh (nghien CLPU nam 1999) de tinh toan gia tic nin cho cac tpa dp ey t h i va chu ky lap cy the. Nin d i t tham chieu la nen trung binh (loai II);
- Su dyng chuong trinh dac dyng de xay dyng ban d i phan vung dpng dat ung vol cac chu ky lap khac nhau;
Quy doi ti> gia toe nin tham ehiiu sang cap dpng dit theo bang dudi.
Thang MSK-64 Cap dgng dat
5 6 7 8 9 10
Dinh gia toe nen (a)g 0,012-0,03
> 0,03-0,06
> 0,06-0,12
> 0,12-0,24
>0,24-0,48
>0,48 Cach quy doi nhu sau (trich nguyen van tie [3]):
Theo nhw mSi tuong quan giu-a hai dai luung trong bang tren, ung vai mdi cap dgng dit la mot khoang gia trj gia tie nin ci/c d^l. Do vay, trong qua trinh chuyen doi de xac dinh cip dgng dit cho cac dia danh hanh chinh, nhom tac gia da chia cac khoang gia trj gia tic nen ci/c dai thanh 3 khoang diu nhau ggi la khoang can dudi, trung binh va can tren (vi dtj dgng dat cip VI se CO khoang gia trj gia toe nen ci/c dai la 25 - 50 cm/s^, se dwgc chia thanh 3 khoang tuong img la 25 - 33.3 cm/s^, 33.3 - 41.6 cm/s^ va 41.6-50 cm/s^). Vi ly do an toan, nhu'ng dia danh hanh chinh nao co gii trj gia tdc nin CIK d^i nam trong khoang can tren thi gia
trj cip d^ng dit tai dja danh do se dwgc nang them mot cip (vi di,i thanh phd Da Nang co gia trj gia tdc nin cue dai la 45 cm/s^ thi cip dgng dit t^i khu vuc do se la cip VII). Vai each chuyen doi nhw vay, bang Phan vung dgng dat lanh tho Viet Nam theo dja danh hanh chinh da dwgc thanh lap.
Co the. nhan djnh rang, ban d i phan vung dpng dit dupe Vipn Vat ly dja c i u xay dyng theo hudng thien v i an toan, do dpng dit dupe tang len mpt cip d i i vdi nhung vung co gia t i c tinh toan nam d can tren [3]. Tuy nhien, quan diim nay co t h i lam tang ehi phi khi thiit k i cong trinh chong dpng dat, do khi tang mpt cip thi gia trj tai trpng dpng dit tang tii thiiu 02 lin.
Cac ban do va bang phan vung dpng d i t theo dja danh hanh chinh dupe dua vao tieu chuin dudi dang cac phy lye bat bupe ap dyng cua tieu chuan (phy lye A va phy lye C). Thang dpng dit MSK-64 dupe trich tCf Thuyit minh ban d i phan viing dpng dit cua Vien Vat ly dja cau dua vao phy lye B, d i lam ro hon khai niem, each phan cip dpng dit va each quy doi tO gia tic nen sang c i p dpng dat.
3.2. Thay doi phuvmg phap sif dung ban do phan vung dgng dat
Trong cac phien ban Tieu chuin cu [7] v i n co 03 ban do phan vOng dpng dit theo c i p dya tren thang MSK-64. Ban do A danh cho cac cong trinh pho thong CO t i m quan trpng binh thudng va thip, ban d i B va C danh cho cae eong trinh c6 tam quan trpng nang cao. Tuy nhien Tieu chuin cu chi quy dinh su dyng mpt ban do phu hpp vdi loai eong trinh d i tinh toan tai trpng dpng dit. Vi dy doi vdi nha chung cu 08 ting, chu nhiem thiit k i ehpn ban do A de tinh toan.
Nhu vay da du thong tin d i tinh dupe gia trj tai trpng dpng dat va co the hoan toan khong can quan tam den ban d i B va C nu-a.
Tieu chuin mdi [1, 6] quy djnh phai sCr dyng ding thdi ca 03 ban do. Trong do mpt ban do se dupe ehpn la ban do thiet k i co sd. Hai ban d i eon lai duoe su dyng cCing vdi ban do thiit k i co sd nham tinh ra hp so to hpp ban do KA 21. Vi dy, eong trinh nha Chung cu 08 tang dupe xay tai Ha Npi, ban do A la ban do thiit k i co sd, c i p dpng dat tinh toan la 7.
Tuy nhien v i n can sie dyng them ban do B va C d i xac djnh hp so KA =1,4 (bang 4 Dy thao TCVN).
Cung eong trinh do, n i u dupe xay tai Cai Rang, ban d i thiit ke eo sd van la A, tuy nhien he so KA =1 doi vdi Cai Rang. Nhu vay, ciing mpt edng trinh, cung mpt ban do thiit k i eo sd, theo Tieu chuan mdi thi gia tri tai trpng dpng dat tai Ha Npi Ion gap 1,4 lin tai
KHAO SAT - THI^T K^ XAY DU-NG
Cai Rang. Theo Tieu chuin cu, hai tai trpng dpng dit CO gia trj bang nhau.
Thay doi nay xuit phat tu dac diem cua Thang phan chia dpng dit theo c i p MSK-64. Mil cip co t h i tuong duong vdi mpt khoang gia trj gia t i c nhat djnh.
Vi dy, theo Vi#n vat ly dja cau [3] thi cap 7 tuong duong vdi khoang gia t i e nen 0,06g din 0,12g.
NghTa IS viing A eo gia toe nen la 0,06g dupe xip vao c i p 7, ma vCing B 0,12g cung la cip 7. Nhung ro rang, eo sy khac biet ve tai trpng dpng d i t xac djnh tpi vung A va vung B niu tinh toan tai trpng dpng dit can cu tren gia trj dinh gia toe nin (vi dy Eurocode 8 [8]).
Sy khac bipt ay da dupe k i den trong tieu chuan mdi thong qua hp s i to hpp ban do KA.
Vipc su dung to hpp 03 ban do co t h i cho phep danh giS tac dpng dpng d i t cua khu vyc xay dyng mpt eSch an toan hon. Day la mpt cai tiin quan trpng, dua phuong phap tinh toan chong dpng dit theo cap cua Nga tipm can vdi phuong phap su dyng dinh gia t i c nen cua t h i gidi.
3.3. Bo sung yeu cau thiet ke chong dgng dat theo hai muv
Tieu chuan mdi da dupe bo sung yeu ciu thiit k i ehing dpng dit theo hai mi>e: Dpng dit thiit k i vS dpng dat tinh toan eye dai.
Myc dich cua vipc tinh toan dpng dit thiit k i la ngan eSn sy mit mat m$t phin hoac toan phin cac tinh chit su dyng cua eong trinh. Cae mo hinh tinh toan cong trinh dupe lay tuong ung vdi vCing biin dpng dan hoi.
Myc dich cua viee tinh toan ehju dpng dit tinh toan eye dpi la ngan can syp d i quy mo cong trinh hoac cae phin cua no, gay ra nguy co mat an toan cho eon ngudi.
Cac yeu cau nay tuong ty nhu Tieu chuin Eurocode 8 (Cung eo yeu c i u thiit k i chong dpng dit theo hai muc: Hpn c h i hu hong va chong syp di) [8].
3.4. Ke den tam quan trong cua cong trinh Cae phien ban Tieu chuan cu khong co hudng d i n phan loai cong trinh theo t i m quan trpng.
Tieu chuin mdi da bo sung bang hudng d i n phan loai cong trinh theo tam quan trpng va co he so tam quan trpng tuong irng (bang 3 cua Dy thao TCVN [1]) danh rieng cho thiit ke ehing dpng dit.
Day la mpt diim mdi trong phien ban nay, thua nhan mpt quan diem thiit k i trong cae Tieu chuin thiit ke chong dpng dat p h i biin tren the gidi: Cong trinh quan trpng hon, thi phai dupe thiit k i chong dpng d i t an toan hon.
Trich tij" [1]: Bang 3. H$ s6 Kg dwgc x6c djnh theo chwc nang cua cong trinh
ChCrc nang cua nha ho|c cong trinh
1 Nha tudng nipm va cac cong trinh khac; nha hSt quy mo Idn, cung t h i thao va gian hda nhae tren 2000 c h i , cac toa nha chinh phCi co t i m quan trpng nang cao, tram phat thanh co ting eong suit phat trong mpt toa nha tren 500 W 2. Nha va cong trinh:
- Chuc nang cua no phai dupe bao dam khi CO dpng dit va khi khac phye hau quS cua no (nha thong tin chinh phCi, nhd phye vy cong tac ei>u hp khan cip vS canh sat; cac hp thong c i p nang lupng va nude; cae cong trinh chO'a chSy, cap ga; cac cong trinh chLPa khoi lupng Idn cac chit dpe va chat no co t h i gay nguy hiim doi vdi khu dSn cu; c^c co quan y t i CO thiit bj d i su dyng trong cae tinh huing tai npn);
- Trong do xuit hipn nguy hiim cho ngudi d trong (bpnh vipn, taiong hpc, miu giao, nha ga, san bay, bao tang, nha hat, rpp xiic, hoa nhae va cac gian the thao, chp e6 mai, cac t i hpp thuong mai e6 mpt ding thdi hon 300 ngudi, nha cao hon 16 tang);
- Cae nha va cong trinh khac ma dung sO dyng c6 the d i n tdi thiet hgi nang n i v i kinh t i , xa hpi va moi trudng.
3. Nha va cong trinh khac khong neu d 1 va2.
4. Cae cong trinh tam c6 thdi gian siJ dung dudi 3 nam
Gia tri
2,0
1,5
1,0
0,75
CHO THiCH:
1. V/#c xac dinh chirc nang nhii va cong trinh do chO dau tw thi/c hi$n theo de xuit cue chu nhi$m thiet ki.
2. Vi$c xep nhd va cdng trinh vdo d6i tuging san xuat nguy hiem din?c tiin hanh phCi hgp v6>i quy dinh cua ph^p lu$t.
3. Khi tinh toAn cong trinh c6 sw dijng mo hinh tinh to6n tac dgng dgng dit, vi du d d?ng gilin do gia toe (tn/c tiip' ho$c tong hgp), bien dg Ion nhat cua gia toe nen phai liy khong nho hon 100, 200 va 400 em/s^ khi dgng dat cua khu dat xay d{mg tuong Cmg la cap 7, 8, va 9 va nhSn v6i h$ so Ko (1 va 2 Bing 3).
T^p chi KHCN Xay di,ing - so 1/2014
K H A O SAT - THI^T K^ XAY DUNG 3.5. Bo sung phan 9 "Cac giai phap chong chay"
Dpng dit lam tang nguy eo ch^y cCia nha va cong trinh. Vi t h i , ben canh eSc giai phap phong chong chay trong tnjong hpp binh thudng, Tieu chuin mdi da bo sung them phin 9 de neu cac yeu ciu, cac giai phap phong ehing chay cin tuan thu khi thiet k i ehing dpng d i t Co the xem npi dung chi tiit cua phin nay trong [1]
hope npi dung tom lupc xem trong [2].
3.6. Thay doi, sua cftu-a, bo sung cac phan ve Nha va cong trinh dan dung va cong nghiep, cong trinh giao thong va cong trinh thuy cong
Cac phin v i Nha va cong trinh dan dyng va cong nghipp, eong trinh giao thong va cong trinh thuy cong dupe soat x6t, chinh sua va bo sung. 0 day khong neu ey the cae thay d i i , vi kha nhiiu. Co the nhan djnh rang, so vdi Tieu ehuan cij, cac phan nay dupe viit ky hon, phu hpp hon vdi diiu kien xay dyng hipn nay [2].
4. Kit luan
Dy thao TCVN "Xay dt/ng cong trinh trong vung dgng dit" dupe bi§n soan tren eo sd TiSu ehuan Nga SP 14.13330.2011 phien ban 2011. Ve eo ban, c i u tnje va npi dung cua Dy thao TCVN tuong ding vdi Tieu chuan goe va su dung ban do phan vung dpng dit theo thang MSK-64 dya tren diiu kipn ty nhien cua Vipt Nam.
So vdi cac p>hien ban Tieu chuan thiit k i ehing dpng d i t cu, Tieu chuan mdi cua Nga SP 14.13330.2011 da cd nhu'ng thay doi quan trpng, the hipn xu hudng hpi nhpp vdi hp thong Tieu chuan
quoc t i , vS cap nhat nhung quan diim thiet k i , phuong phap tinh toan, nhO-ng giai phap ky thuat mdi nham tang cudng kha nang ehing dpng dat ciJa nha va eong trinh.
TAI LIEU THAM KHAO
1. Dy thao TCVN "Xay dung cong trinh trong vOng d^ng dir. Be tai cap Bp, chu nhiem de tai: GSTSKH.
NguySn Van Li§n, Hgi ket cau va cong ngh$ xay dyng, 2013.
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Ngaynh$n bai: 07/01/2014.