DIEN DAN KHOA HOC
C 6 N GNGHfe
TIEN TRINH THIET KE MONG BE - COC CHO NHA
^'^CAO TANG BEN BOf BIEN VANG 6 OXTRAYLIA
GS. TS. Harry G. Poulos - University, of Sydney, Australia PGS. TS. N g u y i n Bdo Huan - CDC (sifU tam)
T
rong bai n^y mo ta tien trinh ba giai dogn thiet k l mong be-cpc nhg eao tang(Type I) ben bd biln Vang d Queensland, Oxtraylia: Dieu tra ban dau t i l p nhgn du- lipu dja chit dge trung t l i thilu g i n dung tu- hgng logt I I khogn khio sdt d l xae (^nh khai quat cae dieu kipn dudi dat va xpm xpt ngan gpn kha nang taiyen tai va dp lun bat Igi eho eong trinh. Phan tich so bp sir dyng ly thuyet dan hoi ap dyng trong d i t k i t hgp kinh nghipm cua cac Ccng ty Idn uy tin cua nhieu QuIc gia d l thiet k l mong b^ - cpc lien hgp vdi dp lun tang nhung khdng vugt qua quan hp tuyen tinh vdi lugng tang tai trpng. Tilp tyc danh gia kha nang chju tai hp mong vdi uu vipt t i l m tang sy tuang tae giCra ba thanh phan: be - cpc - dit. Culi eung, Phan tich chi tiet qua vipe giai chuang trinh phan mem C3ARP 8 tren ea sd thiet k l xae djnh thup kich thude g i n dung eua mong, dudng kinh va chilu dai cpc.Dong thdi su- dyng k i t qua nghien eu-u di tnj-dc eung d p t i l n trinh Phan tieh thilt ke kT han v l quan hp tai trpng- dp lun d cac trgng thai khae nhau de dy doan s y lam vipe eua cdng trinh. (Hinh dudi:
Cac hp k i t d u ly tudng ching 6a tai ngang eho nha cao ting va sieu cao tang)
HE THONG KET CAU CHONG D0 TAI TRONG NGANG
Type I H# khung chju cdt
Type II He khung chju tac d^ng tUting ho Type III He lot rteng biet
Type IV He loi 6'ng s:
* - (CTBUH, 1980) ^%,
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Type I T y p e II Type III Typel'
I.MdDAU - V
Van de danh gia dia ky thugt mong tog nhg cao ting phat trien tnj-dc day tren dit lien eho thiy quan hp ung suit - biln dgng eug dit dudi mong khong t h i d hgp vdi quy mo dipn tieh b>e rpno Idn d dp lun chenh Ipeh khcng dong diu. Thipt k l mong chju tai eye hgn, trudc hit, dgnh gig biln dgng theo thdi gign ngan hgn d thdi gign dgi hgn
- i * " , - * « " ' ' '
I ^ j
_ ^ 5
(d trgng thai gioi h^n su- dyng -SLS), sau do mdi danh gia kha nang chju tai trpng gidi hgn (d trgng thgi gi&ih^n cue h^n -ULS). Mong be-cpc, SLP dyng cpc de kiem trg khong che lun tong the, vdi phin tu- epe cung d p dp cung h l u h i t chju biln dgng dudi tai trgng stf dung, d n p h i n tu- be cung d p them kha ngng chju tai trgng gioi h^n cue h$n. Do do
_ _ ^ danh gia 6\a ky thugt cong trinh bao ham chu-c nang phan tich thong tin, du- lipu, lya chpn Ipgi mong (be dgng ban phang, be dgng san n i m , be dgng hpp, cpc dong hay cpc khoan nhoi...) khong chi quan tam d i n kha nang chju tai ripng d a tu-ng phan tu- cpc hay be ma phai danh gia kha nang to hgp tuang tac cua chung dudi tai trpng su- dyng.
Bai v i l t danh gia 6\a ky thugt cong trinh va ^hilt ke hp mpng be-cpc nha cao ting vj tri xay dyng bpn bd bien Vang d Q u e e n s l a n d , Oxtraylia. Sy danh
I n - \
DUdng ranh gl6I khu dat gianh cho toa nhd cao lang
Hinh 1: Mat bang dinh vi lo khoan dia chat
Anhl: Toa thap cao 319m, 52 tang (TypelV) Tiiiet ke 2007
gia nay cho phep md rpng be thoa man dp lun chenh Ipeh tieu chuin chinh xae va dy bao SCPC chju tai gidi han cua cqc trong hp mdng.
2. o y AN TOA NHA CAO T A N G
Dy an toa nha thap cao 30 tang, 176 can hp tog Igc d Surfprs Pgrgdise Queenslgnd, Oxtrgylig bit d i u khdi cdng xgy dyng tu- cuoi nam 2004 va da hoan thanh vao cuoi nam 2005.
Dieu ki$n dja chat va dia ky thu$t cong trinh.
Mgt bing toa thap d Surfers Paradise tren nln boi tieh phu sa t y nhien nhieu Idp khac nhau. Dydi t i n g phu sa la Idp soi eupi lan cat trai rpng tren nln
NGl/dl XAY DUMG S 6 THANG 12 • 2009
TIEN TRINH THIET KJ M6NG BE - COC.
da qugng ngim (Hinh 2). Khao sat dja chat d n g trinh (BH1-BH6) d giai dogn diu qlm 6 ho khoan sau vao tang cat each mat da ngam khoang 5m;
giai dogn hai khoan mpt se ri lo khoan (X1, X3 "X") vao da quang ngam d dp sau - 40,5 den - 42,5m xuyen qua cac Idp set lin eat/cat pha, set, eupi soi lin eat (Hinh 1). Myc nude ngim elt -5,5m, nude mat dudi mat dit -0,7m, eho phep dao h i mong tang him sau tren 6m. Chip nhgn mo hinh d t djg ting hieu ehinh tieu bieu nhu Hinh 2(kPa= 10t/m^).
3. MO HiNH DjA KY THUAT
Hinh 2 So dd edt dia ting vd ede thdng
xuyen tdi Idp cat mong nim tren Idp set eCmg den rit cCrng, be chieu day khoang 0,8m dipn tieh mat bang: 50m x 24m, chieu day be hai mong dugc gia thiet la be eCpng tuang dli, tit nhien phat sinh Cmg xu- dp ICin tong thl, dp lun chenh Ipeh, npi lye moment uon va lyc d t .
Nhin ehung dya tren ca sd danh gia ban diu d the kit lugn rang tronq khi ehi rieng mono be da d hp s l an toan tong the Idn han 10 (dit nen chua bj pha hogi nhung bien dgng Idn) tuang Crng to hgp hogt tli va tinh tai thi thilt ke mong bj chi phii bdi sd dja ky thudt duge Du dn chip nh$n
Loai d^t,
ChlSu day ldp dett ktiac nhau va Cfit day ldp Cat chlfiu dSy hon 10m Cft - 1 ^ -11 Biin s6t(l5n cat) day-7m cft-11-> -18 cat day 2 m cft-18 ^ -20
Set pha san /a cat day- 8m eft -20 -^ -28 Cat l5n cuOl s6i day-6m cfit -28 -> -32 Cufii s6i l5n cSt tiky-Zm c6x-32 -*• -38 Ba quang ngSm eft -36 - 40,5 -> - 42,5
Nspt trung binh
60 10 60 14 25 100
-
Li,ft: cSt Su (kPa)
- 30
- 250
- - -
Es (bg) MPa
90 8 90 25 37,5 150 2000
Pu (be) MPa
5,4 0,5 5,4 1,5 2,25
9,0 -
Es (cpc) MPa
120 20 120
40 50 200 2000
f s kPa 100 22 100
60 48 100
-
fb MPa
9,9 0,7 9,9 2.0 4,t 10 10
Thugt ngCi- (Ja ky thugt lien qugn cac thong so 6ia tang (Hinh 2) dung vao thilt k l nhu sau:
Es (be) = modun biln dgng vgt lipu dan hoi de danh gia Crng xu- cua be (Mpa)
Pu = Kha nang chiu tai trpng cua mong be (Mpa)
Es (cpc) = modun biln dgng vat lipu dan hii de danh gia Cmg xu- cua cpc (Mpa)
fs = lyc ma sat gidi hgn eug thanh cpc (kPa) fb = kha nang chju tai gidi hgn d mui cpc (Mpa) Trong vipe danh gia cac thong s l tren da su- dyng kien nghj cua Deeourt (1995) cCina vdi kinh nghipm duac tich luy nhilu nam cua nhieu tac gia, tac pham di tm-dc de lya ehpn thong tin dung vao thilt k l mong be - cpc nhy chi s l SCPC khang xuyen Tieu ehuan co hipu chinh NgpT va dp cCpng cua mdng vdi cac thong s l kha nang chju lyc khac.
Them vao (Ja ky thugt eong trinh la gia thilt su- dyng thong so modun biln dgng dan hii cua dat dudi mong be^(Es) cd gia tri tuang Cpng tai lgp thi nghipm gip 3 lin tai su- dyng ban dau. Gia thilt nay dung d l udc tinh bu tm- mpt phin che dit vgn ehuyin di sau tren 6m va sau do duae bu Igi bang tai trpng be betong.
4. DANH GIA SO BQ D\A KY THUAT 4.1. Mddlu
Tm-dc khi danh gia ehi tilt dja ky thugt eong trinh, hgy xem xet cac sa do hp mong duge dung danh gia dja ky thugt cong trinh nhu sau:
+ Mdng ehi co rieng be ma khong co cpc + Mong be lien hgp: 50 cgc
+ Mong be lien hgp: 70 cpc
+ Mong be lien hgp: 140 cgc (oin dung v(yi gia djnh thilt k l mong do nha thiu de xuit)
Vdi myc dich danh gia sa bg mdng, cgc dudng kinh 0,7m, chila dai tmng binh khoang 18m khoan
dp ICin. Can chu y han la van d l kha nang manq tai gidi hgn (dp ben) cua dit. Sy hipn dipn cua tang eat trim tich d trgng thai ehgt den rit ehgt eho phep be phat trien quan trpng dp cCpng va kha nang mang tai trpng dCrng han n&a.
4.2. Phuxyng phap phan tich
Doi vdi danh gia sa bp be cpc, d the SCP dyng md rpng phuang phap phan tich gan dung ve Cmg xu- quan hp tai trpng-ICin ma Poulos (2002) mo ta.
Phuang phap nay su- dyng phuang trinh Randolph(1994) phat trien de tinh toan dp cCpng cua be-cpc theo thugt ngCi- be, gia tri dp cCpng nhdm cpc va phan ehia tai trpng giu-a be va epe.
Dudng eong quanhp tai trpng-lun gom 3 dogn thing dugc trich din tCp t\er\ tfmh ThO tuc thiet ke eua tac gia.
Sy md rpng thu tyc nay duae Poulos (2005) phat triln de bu thilu tai do dit h i mong bj dao di.
Trong thu tyc md rpng tinh toan cung dua vao dp cCmg dit nln trong qua trinh chat tai pha lgp Igi sau khi da thye hipn dao h i mong. Sy tang tai nay theo qua trinh tang dp cu-no dat nen, dp cCpng cua be tang trong tiln trinh chat tai lgp. Do bdi be chju tli trpng Idn dan cho tdi khi ap lyc dit nen tiep xuc dudi be (vuan) tien tdi ap lye ban diu tm-dc day, tgi do dieu kipn tai trpng cpt dit nguyen thuy (vir- gin) thudng xuat hipn. Dieu nay thudng xay ra khi ap lye be can bang ap lyc dit nen giam do dat h i mong dao chuyen di. Sau do kiem tra dp eCrng be cung dp cCpng dat nen d tai trpng cpt dit ban diu (virgin). Vi vgy tCp giai dogn ngy se din tdi ti Ip tai trpng tac dyng vao cpc rpng han. De danh aia sa bp, ngydi ta gia thilt rang su- dyng modun dat nen dudi tai lgp 3 lan gia tri tai su- dyng ban dau (tai SLP dyng nao diy) hay bang tai trpng (virgin) cpt dat ban diu. Phan tich nay ed Idi giai bang chuang
NGl/dl X A Y DUklG S6 THANG 12 • 2009
! TIEN TRINH THlfT K^ IV16NG B^ - COC...
trinh MATHCAD do tac gia phat trien . 4.3. Kit qua phan tich
Kit qua danh gia sa bg dja ky thugt dugc minh hog d Hinh 3 vg Hinh 4. Bilu thCpc quan hp tai trpng - dp ICin duac mo ta tren Hinh 3 dli wa\ tai trpng SLP dyng tang len 3 lin tai ban dau. Do thi dudng tai trpng- dp lun trpn Hinh 3 cung chi^ra ring dp ICin tong the d xu hudng giam thpo s l lugng epe tang len, nhung d tee dp giam din. D l thj nay cung chl eho biet sy chuyen tiep tir gia tai lgp den nhu-ng dilu kipn tgi trpng (virgin) tgi elp t l i trpng tuang dli thip vg gilm hgp ly thi nhu-ng dilu kipn dp eCrng tgi trpng d t dit ban diu tmdc day dugc lgp Igi.
*
1
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i
i i
^r!!!!!r^sJ_„
1 • "
: 1 i
Monn he + 70 iOC lidn ldist(diingi tdi si(dimi; he khOrifi ed ege Mdtifi be ilem thudn
Mon:^ hi' + 50 eoe Mims he + 140 , oe
Tnjc tung: tai trpng th! nghi?m (MN);
Tnjc hoanh: dg lun (mm) Hinh 3: Ba5ngcongtai-lunti(
Phan tich tinh toan
2 ldn ldi ste dntig 12 Idn ldi sie dung he klwn^ eo ege S ldn tdi si( ditng I 3 ldn ldi su dluig
he khdng ed ege
Tryc tung: dp lun (mm);
Trgc hoanh; so lUpng coc Hinh 4: Dglunanhhuclngtheoso
li/dng cgc tif Phan tfch tinh toan
TCP du- lipu trpn c6 thl dug rg nhgn xet nhu sau:
Mpng be co dp lun tmng binh qua Idn gin nhu bj vu(?1 qua gia tri dp lun eho phep
Dp lun truno binh giam dang ke dudi tai trpng su- dyng khi so lugng cgc trong mong tuang doi it.
Lai ich khong dang k l trpng trudng hap s l lugng ege gip doi tCp 70 tang len 140 ege dudi tai trgng su- dyng. Song d d p tai trpng cao han thi dp lun tong giam mpt cacih dang ke.
Trong phan tich sa bp chi xpm xPt Cpng xu- quan hp tai-ICin tong the, mpt so cac hgu qua khae khong duac danh gia chi tilt nhu dp ICin chenh Ipeh, kich Bang 1: Tdm tit dO lun tong the tinh todn dudi tai
trpng tdng 1, 2, 3 lin tai su- dyng ban diu
S6 luqng cpc duOi mong b6
0 50 70 140
D
NGIDO lun trung binh dudi t i i
SLf dung (257,8 MN)
98mm 58mm 49mm 37mm
1/dl XAY DU
DO lun tmng binh duidi 2 l i n t i i trpng si!f dung (515,6 MN)
234mm 153mm 106mm 79mm
k4G S6 THAN!
DO lun trung bin dudi 3 \in t i i trgng si!f dung
(773,4 MN) 370mm 294mm 247mm 121mm
2 12-2009
thLPdc chieu day ban be va vj tri b l tri cgc , vin d l nay se dugc d l d p a giai dogn thiet ke chi tilt.
4.4. Nhan xet v§ phan tich sv bg dja ky thuat Dya tren nhCi-ng kit qua danh gia sa bg dja ky thugt cong trinh, co the nhgn xet rang hp mong be- cge^ la rript trong giai phap mdng d anh phudng nhilu din kinh t l nha cao tang. Dp lun ting thp tmng binh phu thupc vao dp Idn tai trpng su- dyng va so lugng cgc co dudi be; vdi be d them (50,70,140) cpc, thi dp lun tong the dy bao tu-ang Cpng khoang tCp 37~ 58mm (Bang 1)
5. THI^T Kt CHI TltT MONG
De danh gia sa bp mong eho toa nha cua dy an tren ea sd chip nhgn du- lipu djg ky thugt sgu dgy:
Logi mong bin be phing betong c»t thep day 0,8m d t day be d dp sau -1 m. So lugng cpc huy dpng dudi mdng be 136 ege dya tren ca sd phan tich thCpa nhgn de ggnh dd tgi trgng: cac cpt, mpt so tudng chju lye va loi eCrng toa nha.
Danh gia gan dung eong nhgn chpn thilt k l hp mong ege khoan nhoi co duong kinh 0,7m dai 18m.
Nhu-ng epe nay 6\jgc thilt ke gia S\n\\ mui cpc tya vao Idp eat ehgt tuang doi mong, nhung cho phep de tien hanh phan tich kha nang mui cgc keo dai tdi Idp set pha eat /hogc Idp cat phg set la thich hgp.
Kha nang chju tai eho phep ege dan theo dit nen duge bao danh gia khoang 4,2MN (420 tin: xem Hinh 3).
5.1. Hp sd to hg'p tai trgng
So lipu tai trpng cong trinh tren ca sd tai trpng to hgp khac nhau do ky su kit d u dy an cung d p duge su- dyng de tiln hanh danh gia dja ky thugt.
s l lipu tai trpng eung d p gom ed hang logt tai trpng dCpng dudi cpt. Bang 2 tong hgp cac hp so to hgp tai trpng dya tren ea sd d myc 2.1 thecTleu ehuan tai trpng Oxtraylia AS1170 0-2002. Cdng trinh duge danh gia theo hai nhom trgng thai gidi hgn su- dyng vg eye hgn .
Bang 2: Cdc h$ so cua to hgp tai trpng de ddnh gid
mdng b6- cpc HS s616 hpp tii trpng Trang
thai til trpng glcH han Si!i dung Z\Sc han Cut han Ci,ft: han Cue han Ci,jc han
TTnh til (G)
1 1,2 1,2 1,2 0,9 0,9
Hoat t i i (Q) 0,4 1,5 0,4 0,4
- -
Tii trpng gid hodng duang (cho phep)
(Wp+)-
-
1,35
-
1,35
-
Tii trpng gid hudng dudng (cho phep)
(Wp)
- - -
1,35
-
1,35 Chu thieh : * chip nhdn h$ s6 tdi trpng 1,35 cho h$
s6 tdi gid eho phdp din tdi gid gidi han
5.2. Danh gia dy^ vao biln dgng theo trgng thai gidi hgn sir dgng
S l lipu tai trpng do ky su kit d u cung d p duge dung de danh gia 6\a ky thugt dya tren ca sd
TIEN TRINH THIET Kg' M 6 N G BE - COC...
tai trpng su- dyng 6e danh gia biln dgng mdng be cpc gia djnh. To hgp tai trgng su- dyng 6u'gc danh gia ea ban d myc 2.1, theo tieu chuan tai trpng Oxtraylia AS1170 0-2002. Danh gia 6\a ky thugt cua be - cpc theo Idi giai chuang trinh GARP 8, de phan tieh mong be-cpc va phan tich cac phin tu- d i t xung quanh epe. Chuang trinh C3ARP 8 la phan tieh tong quat mong be epe b i t d i u phat triln d Trung tam Nghipn CCPU Dja ky thuat tgi trudng tong hgp Sydney.
GARP (General Analysis of Raft with Piles) dya tren ca sd phan tich PTHH cua be ya phan tich cac phin tu- xung quanh cua eae cgc. U'ng suit t i l p xue tae dpng giu-a be va d i t n l n duge gia thiet la dcmong khoi d ap lye phan b l d i u tac dpng qua mli phin tu- trong mong be . M l i cgc dugc gia thilt ap dyng mpt phan luc tgi mpt diem d d l mong be (tuang Crng mpt nut trong sa do). Phan tich cac phin tu- bao quanh dugc SLP dyng de tinh toan tuang tae cua doi cgc hogc mpt cpc vdi mong be.
Trong nghien eCm ngy ngudi tg gig thiet rang d i t la moi tmdng vgt lipu dgn hoi. Neu d i t hinh thgnh nhilu Idp, trpng lugng t h l tich d i t tmng binh d g mli Idp dugc SLP dyng theo djnh nghTa can bing vdi dge trung dan hoi cua dung trpng d i t toan t h l .
N l u Cpng xu- cua cpc/ d i t la phi tuyen (dan hoi- deo), dilu nay dugc mo hinh bdi dp eCpng d i t ehe phep giam nhu tai trpng epe giam thPo ham s l hypprbplic. Seng tuang tac giu-a cgc/ege va tuang tac giu-a ege/ be 6wgc gia thilt la hang so (cac gia trj dp eCpnq nguypn thuy cua cpc). Chat tai len be eo the bao gom tai trpng tgp tmng tai m l i (Jem hpgc tgi vg moment phan bo d i u . Chieu day mong be cung CO the quy doi khae nhau de tgo thanh mgng ludi nut phin tu-. Dp lun vong xuIng ggy rg do lyc d t , moment trong be vg tgi trpng thang dCrng trong cpc tinh nhu tai trpng da dugc danh gia. Chuang trinh phin m i m GARP 8 lap tren mo hinh dung thilt k l ban ve be-ege ban d i u (be day 0,8m, cpc duong kinh 0,7m, dai 18m).
Ket qua danh gia ban d i u mong be lien hgp thye hipn 136 epe duge tom tat d Bang 3.
Bang 3: Tdm tdt ket qua dO lun dudi tai trong su- dyng bdng phdn tich so bO chuong trinh GARP
Trang thii biS'n dang Ci/c han DO lun Idn nhft DO lijn nhd nhSX Goe xoay Idn nh^t (6 )x max
(0 )x min (9 )y max (e )y min
Gii tri dfi liin 36mm 0,4mm 0,0014 radians (1 /714) -0,0020 radians ( 1 / 500) 0,0025 radians (1/400) -0,0024radians (1/416)
Phan tieh sa bp thilt k l lya ehpn be cpc sau day dugc danh gia bao dam kinh t l han. Con xay ra thay doi so lugng^cpc sau nay la do vipe danh gia chinh su-a thilt k l theo tai trpng su- dyng.
Bang 4 ehi ra rang tinh toan dp lun tong the dge tmng Idn nhit 44mm lg nho han dp lun eho phep
Bdng 4: Kit qud Idi giai chuong trinh GARP phdn tieh dudi tai trpng su- dung vdi 123cpe
BiS'n d^ng Ci/c h^n DO lun Idn nha't = Smax DO llJn nh6 nhcft = Smin DO lun chfinh l?ch tuong dO'i giSa hai
eft lifin kg (AS/L)
Gia tri (]0 liin 44mm
1mm 22,5mm(1/444)
Hinh 5: Mat bang du5ng bao lijn tinh toan dudi tai trpng stf dung
Idn nhat la 50mm, trong khi dp lun chenh Ipeh eho phep bang 1/400 xay ra giCi-a hai cpt lien k l : giCi-a cpt ngoai tai trpng t u a n g d l i nhp so v d i cpt phia trong tai ngng han. Sau day thao lugn eua nha thau thi d n g cxpc, h a n nCi-a vipe danh gia tien hanh sau khi da them cgc cyc bp tgi tgm eua nhom cpc d u d i mpt trong hau h i t eae cpt c h i t tai nang de lam giam dp lun chenh Ipeh. H a n nu-a k i t qua danh gia lun chenh lech nho han dp lun Ipeh cho phep (1/444 = 0,00225 1/400 = 0,0025).
Dudng bao dp lun tinh toan trong trudng hap nay minh hog tren Hinh 5. Vgy thiet ke eo the gigm s l lugng cgc (tCp 136 con 123 cgc) cho phu hgp danh gia thilt k l theo trgng thai gidi hgn eye hgn mgng Igi hipu qua giam s l lugng ban d i u .
5.3. Danh gia d^ra vac su>c chju tai theo trang thai gidi han C^PC hgn
Danh gia npi lyc trong be epe da thi cdng su- dyna trgng thgi gidi hgn cyc hgn tien hgnh vdi hp s l to hgp tai trpng duge tom tat d Bang 2. Ket qua tinh toan eae gia tri moment, lye d t Idn nhat va nho nhit d l i vdi k i t d u chju nhu-ng tae dpng khae nhau dugc tom t i t d Bang 5. Bai toan giai bang Chuang trinh GARP 8 cung d p thilt ke k i t d u ban be phang theo dCi- lipu ve sa do dudng bao moment, lyc d t phan b l tren be cpc tinh toan vdi tmdng hap tai trpng gidi hgn khae nhau. Thee Idi giai GARP 8 eho k i t qua tinh toan cpc chju tai npn mpt vai gia tri Idn nhit |6,37MN) vugt qua kha nang chju tai trpng thilt ke eho phep Idn nhit eua cpc: 4.2MN. Nhu-ng k i t qua nay ehi dya tren
Anh 2: Khong gian Taikoo - Hui development- Quang Chau
NGl/dl XAY D O M G s d THANG 12 - 2009
chuang trinh phin mem C3ARP 8, nguvc Igi tac dpng Cpng xu- trong hp be - epe vdi s l lugng cgc bj hgn ehe, nen ege chju t l i nhilu han kha ngng gidi hgn eug chung. Sau do XLP ly thilt k l bing giai Igi GARP thi mpt vai phan lyc nao do vu(?t qua tai trpng thiet ke Idn nhit trong hp be- epe 6wgc phan phoi Igi khi SCPC chju tai cpc t i l n tdi tai thiet ke Idn nhit.
Bang 5: Ket qua phdn tich doi vdi trgng thdi tai trong gidi hgn SLP dyng theo chuong trinh GARP
Kf hi^u Mxmax Mx min My max My min M „ max Mx, min Vx max Vx min Vy max Vy min
Pile Load (chju nen til c[ia cpc) Pile Load (chju k^o)
G\i tr|
2.66 MNm/m - 0.89 MNm/m 3.27 MNm/m -1.11 MNm/m 0.82 MNm/m - 0.78 MNm/m 7.59 Mti/m' - 7.1 MN/m' 7.02 MN/m*
- 6.75 MN/m' 6.37 MN - 0.24MN
Tif hffp \i\ frgng 1.2G + 1.35Wp4'Q 1.2G + 1.35Wp'FQ 1.2G + 1.35Wp TQ 1.2G + 1.35Wp4'Q 1.2G + 1.35Wp>PQ 1.2G + 1.35Wp>FQ 1.2G+1.35Wp'FQ 1.2G+1.35Wp'i'Q 1.2G+1.35Wp'i'Q 1.2G + 1.35Wp4'Q 1.2G + 1.5Q 0.9 + 1.35Wp
Anh 3: Haeundai U-Dong,
tiai toa thap 70 & 80 tang cao 300m (Typelll)-se hoan thanh 2012 5.4. Danh gia dg lun nhgy cam
Them vao danh gia trgng thai SLP dyng va gidi hgn cyc hgn torde dgy t i l n hanh d y bao dp lun nhgy d m eug thilt k l be epe dyg tren xem xet anh hu-dng tang hogc gigm dp eCrng epe eye bp dudi h l u h i t d t chju tai trpng ngng. Mp hinh dp eCrng cgc thay doi 40% va ap dyng cho d hai trgng thgi tai SLP dyng va tai gidi hgn eye hgn, d do trudc day cgc dugc danh gia chju tai trpng Idn nhit. Bang 6 tom tat dp eCpng cpc thay doi ±40% anh hudng tuanq d l i it d i n dp lun tong t h l .
De d y bao dp ICin vong eua mong be tren ca sd tai trpng su- dyng, trong khi danh gia moment Igi ap dyng theo trgng thai qidi hgn eye hgn. Ket qua cua vipe danh gia eho thay rang trong hp mong be cgc gia djnh kha nSng chju tai cgc d u thCra nhilu
TlfeN T R I N H T H I E T KE M 6 N G Bt • COC- nen tai trpng va dp lun dugc phan b l Igi qua mgt cat ngang be - cgc thay doi, song Cmg XLP do lun toan bg chju anh hudng nay tuang doi nhd
Bang 7: Tdm tat nhCi-ng gia tri dg lun nho nhat va dp lun Idn nhat cua cpc dgt dugc dudi tgc dpng v l dp eCpng k i t d u thay doi khae nhau
Bang 6: Odnh gid dd lun nhgy cam trudng hgp tai trpng su- dyng theo ket qua phdn tich GARP
Hi$n tupng bi^n dang
Q^ IGn tdng th^ du<3i t i i trpng siJf dung DO lOn ehfinh l$ch giiTa cOt vcl b blSn m6ng b6
DO ctimg tieu ehu^n eua cgc
39mm 9mm
DO cimg cpc Ting (+40%).
38mm 8mm
DO cirng coc Giim (- 40%)
38mm 8mm
Bang 7: Ddnh gid dO trpng gidi hgn cyc hgn
lun nhgy cam trudng hgp tai theo kit qua phdn tich GARP
Nfii luc Mx max M, min M, max M, min Mn max M„ min VJ max*
V. min*
Vy max*
V, min*
Pile Load (chju u&n t i i ciia coc) Pile Load (chiu k^o)
0^ cufng tigu chuin cua cpc 2.66 MNm/m - 0 86 MMm/m 3 27 MNm/m -1.11 MNm/m 0 82 MNm/m - 0.79 MNm/m 7,59 MN/m - 7.10 MN/m 7.02 MN/m - 6.73 MN/m 6.23 MN
- 0 . 1 0 M N
Dfi CLfng CQC tang (+ 40%) 2.67 MNm/m - 0 86 MNm/m 3.26 MNm/m - 1 11 MNm/m 0 84 MNm/m - 0 75 MNm/m 759 MN/m - 7.10 MN/m 702 MN/m - 6.73 MN/m 6.22 MN
- 0 1 0 M N
Dfl CLing coc giim (-40%) 2.67 MNm/m - 086 Ml\lm/m 3 26 MNm/m - 1.11 MNm/m 0 84 MNnfi/m - 0.75 MNm/m 7.59 MN/m - 7 1 0 MN/m 7.02 MN/m - 6.73 MN/fn 6.22 MN
- 0.10 MN
Chu thieh *Tdi trpng tinh todn eho cpc chl dua trdn ly thuyit ddn hdi.
Anh 4:
Shanghai Center Tower, cao 580m, cao hfln Kim Mau 160m cao hflti TTTCTG 88m ; thi§t ke (29/11/2008 ~ hoan thanh 2014).
NGUdi XAY mfiiG S6 THANG 12 • 2009
I
TIEN TRINH THIET KE M6NG BE - COC.
Sy phan phii Igi moment va lye d t d nhung tnjd-ng hgp tai trgng gidi hgn do tdc dpng kit d u bj lun chenh Ipeh nho han gia tri da danh gia. Sy chenh Ipeh giu-a trudng hap dp d n g cpc tieu chuan vdi dp cCmg cpc tang hogc giam nho han cd the dugc phan bo Igi anh hudng eua lye va Cpnp suit eua be day 0,8m. Tai trpng tae dpng Idn nhat len cpc bang kha nang mang tai thilt k l Idn nhit da dy bao la: 4,2MN (=420tln)
6. K^T LUAN
Phan tich tien trinh phat trien thu tyc danh gia
Anh 5: Toa nha Tameer Towers -Abu Dhabi, UAE cao 314m CO 4 tang ham (khdi cong 11/2007 thi cong 18
thang)
thiet k l mdng vdi be-cgc md rgng be gom ba giai dogn: ddnh gia ban dau kha nang thye hipn thilt kl, giai dogn trung gian lya ehgn logi cgc va dp sau 6\a ting dgt epe, d^nh gig thiet ke chi tilt ve Cmg xu- mong trong eae trLPdng hgp tai trgng cue dgi ehl tae dpng trong thdi gign ngin hogc ehi xiy rg mpt lin trong suit thdi gian lam vipe cua d n g trinh.
Chuang trinh phin mem GARP giai bai toan hipu qua dli vdi dia ky thugt d n g trinh phCpc tgp, no minh hog sy phu hgp giCi-g phan tieh thilt k l kit d u mong be-cpc va trgng thgi lam viee thye tiln theo kit qua tinh toan eua ky su kit clu cong trinh lam eong tac thilt ke nen mong.
Be - cpc lien hgp thfch hgp nhit eho cdng trinh kit d u manh chju tai eye dgi, qui mo be rpng vg sau, cac dieu kipn dudi mgt dit phCpc tgp va gia thanh mong so vdi kit d u phin tren.
Su- dyng logi mong trien vpng ngy dudi tai trpng sO- dyng, cpc ed chCpc nang giam lun chenh Ipeh
khong dona diu, udc tinh tiet kipm 30% gia thanh xay dyng mong.Q
Anh 6: Toa nha Burj Dubai 162 ting, cao 850m (type IV) -2008;
-5-
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^ (a) Tam nhin cac
phan tCr mo hinh
4 (b) Sci do cac phan tiJI dat - be - cpc
. M ' V I A V
" • I I > — m — n - i — m V.=HC|t*P: »!lS»!M^nf q;=Sftl **=5 On
I I < I I I 111 I I I Vi-)!KW< P.L J dbwM' ^.M l=i mr.
_ - C ' J - U i _ I J L J i U - . pilc-'jp depth level
(c) Cung cap so lieu ho dao dat vao chUdng trinh va dac trUng mat cat dia chat de cot dau cpc Mpt VI du thUc t i i n : Fig 2 - Sd do mo hinh he 3D - PGSS
©Phan tiJ coc-cpt 9 Phan tCr cpc khdng cpt •Phan tCf be - dat -Phan ttJld XP vay quanh Chl#u cao tang thong thuy van phong : 2,5 ~ 2,9m; Chieu cao can ho dien hmh: 2,3 ~ 2,75mg
NGUdi XAY DUMG sd THANG 12 • 2009
