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Tuyin tap cong trinh Hpi nghi Ca hge todn qudc Ky niem 30 ndm Vien Ca hoc vd 30 ndm Tgp chi Co' hoc Hd Npi, ngdy 8-9/4/2009 '
Tinh toan thiet ke ket cau thep can true thap xay dyng theo TCVN 4244-2005
Duong Tru'trng Giang, Pham Quang Diing
Khoa Co khi Xdy dimg - DHXD. Email: [email protected] TrSn Nhat Dung
Khoa XDCT Qudc phdng - Hge vien KT Qudn su. EmaU: [email protected]
Tdm tit: Bdi bdo trinh viic nghiin cu-u tinh todn thiit ke kit cdu thep cdn true thdp vd chieo'ng trinh chuyen dung tinh todn kit cdu thep cdn trite thdp theo tieu chudn thiit ke, chi tgo, kiim dinh thiit bi ndng TCVN 4244-2005. Chuang trinh ndy thiit ldp tren ca sd chuang trinh ciia cdc tdc gid da xd)' dung tie trudc theo tieu chudn thiet ke cdn true thdp COST 13994-81.
1. Dat van de
Can true thap la thiet bj nang chu luc, khong the thieu trong xay dung, dac biet la cac cong trinh co do eao lan. Cung vai su phat trien nhanh cua cac khu do thi thi nhu eau ve can true thap de xay dung nha cao tang la rat Ion va ngay cang tang. Ket eau thep can trvic thap la mot ket cau dan khong gian phuc tap dang thap - can vai hang ngan phan tii', kich thuoc rat Ion, do cung nho va trong luong chiem tai 80% trong lugng can true thap. Vi vay viec tinh toan ket cau can true thap la rat phuc tap va ton nhieu cong, doi hoi phai eo su trg giiip eua may tinh voi chuong trinh tinh toan chuyen dung moi dam bao duge do chinh xac can thiet va dap ii'ng dugc yeu cau thire te ve thai gian tinh cung nhu tinh da dang ciia cong viec nhu thiet ke moi, thiet ke cai tao, tham dinh thiet ke...
Trong giai doan truoc Viet Nam chua ban hanh tieu chuan tinh toan thiit k§ cKn true thap, tai lieu ky thuat ve tinh toan thiet ke ket eau thep can true thap hau nhu chua dugc nghien cuu pho bien. De phuc vu eho nhu cau thuc te, hge tap nghien eiiu ehiing toi da xay dung thuat toan va lap trinh de xay dung cbuo'ng trinh chuyen dung tinh toan ket cku thep can true thap theo tieu chuan GOST 13994-81 eiia Cong hoa lien bang Nga [1] va da bao cao tao Hgi nghi co bgc toan quoc thang 10 nam 2006.
Til' cuoi nam 2006 Viet Nam da ban hanh tieu chuSn thiet k§, che tao kiem djnh thiit bi nang TCVN 4244-2005. Day la tieu chuan duge ap dung chung cho hau bet eae thiit bj nang ngoai tru cae thiet bj dugc lap tren tau thuy va cae cong trinh tren biin, no dugc bien soan tren CO so quy pham thiet ke, che tao thiet bi nang cua Chau Au FEM 1.001 [3]. Dieu nay doi hoi ehiing ta phai ap dung trien khai, nghien cuu theo dac diem tinh toan ciia kit cau thep cSn true thap va phat trien chuong trinh chuyen dung tinh toan kit cku thep can true thap theo quy djnh moi.
Vi nhirng ly do neu tren de phat triln chuong trinh chuyen dung tinh toan ket cau thep e4n true thap theo TCVN 4244-2005 cin thiit xay dung quy trinh tinh toan chung, thuat toan cho
Tinh todn thiit ki kit cdu thep cdn true thdp xdy dieng theo TCVN 4244-2005 41
viec tinh toan tai trgng, chia nhom tai va thiet lap to hgp tai trgng, kiem tra kit cau theo yeu eau ciia tieu chuan, lap trinh may tinh va ap dung tinh toan thu nghiem. Trong pham vi bai bao nay khong eho phep ehiing toi trinh bay toan bg noi dung tren ma ehi gioi thieu quy dinh tinh toan tai trgng, kiem tra kit c4u thep thiet bi nang theo TCVN 4244-2005, thiit lap to hgp tai trgng trong quy trinh tinh va dac biet kiem tra truang hgp ket eau chju biin dang Ion cho chuong trinh mai, giai thieu chuong trinh chuyen dung tinh toan ket eau thep eSn true thap (ten ggi Cranevn V 1.02) duge phat triln theo tieu ehu4n TCVN 4244-2005.
2. Quy dinh tinh tosin, Idem tra ket can thep thiit bi nang theo TCVN 4244-2005 2.L Tdi trgng tinh todn vd trudng hap tdi trgng
Tieu chuan TCVN 4244-2005 q'uy dinh khi tinh toan thi vi tri tuong dii giu'a cae bg phan ket cau can true phai a trang thai nguy hiem nhat trong so cac trang thai eho phep trong boat dgng eiia can true va trong lap dung. Doi voi can true trong trang thai khong lam viec can co the quay tu do theo huang gio va xac djnh trang thai tinh toan khi khong lam viec a vj tri gio thoi theo dgc can. Theo quy dinh can true thap phai dugc tinh toan kiem tra trong trang thai lam viec va khong lam viec, huong ciia tai trgng trong moi to hgp phai la nguy hilm nhSt.Tbeo quy dinh khi tinh toan ket cau cac thiet bi nang phai xet eae thanh phan tai trong sau
- Tai trgng thuong xuyen gom: tai trgng gay ra boi trgng.lugng ban than SQ, tai trgng dgng khi nang vat IJ/SL , vai MJ la he so dgng luc phu thuoc vao toe do nang tai, tai trgng do cae luc quan tinh va ly tam khi can true lam viec SH.
- Tai trgng khong thuang xuyen gom: tai trgng gio trong trang thai lam viec Sw , tai trgng do nhiet do duge tinh khi yeu cau dac bjet.
- Tai trgng bat thudng gom: tai trgng gio trong trang thai khong lam viec Swmix, tai trgng thu tai kiem djnh, do tac dung do va giam chan ST.
Trong tinh toan ket eau thiet bi nang, tieu chuan TCVN4244-2005 chia lam 3 truong hgp tai trgng co ban:
- Truong hgp tai trgng I khi thiet bj nang lam viec khong eo gio, cac thanh phan tai trgng duge xet den gom: trgng lugng ban than S c j a i trgng dgng khi nang V|;SL, cac tai trgng quan tinh va ly tam, phan lire ngang SH tat ca duge nhan vai he so Yc dirge chgn theo nhom thiet bj nang.Dugc bieu dien bang bieirthiie
TT1=YC(SG+VKSL+SH) (1)
- Truong hgp tai trgngJI khi can true lam viec vai ap lire gio thiet ke, eae thanh phan tai trong dugc xet den gom: truang hgp tai trgng I va gio trong trang thai lam viec. Dugc bieu dien bang bieu thiic
TT2=Ye(SG+VSL+SH) + S,v (2) - Truang hgp tai trgng bat thuong III gom cae truong hgp tai trgng
Can true khong lain yiee chju tae dung gio Ion nhat trong trang thai khong lam viec:
TT3I=SG+S„,„nx (3) Can true dang lam viec chju tac dung lire do va vao giam chan (voi can true di chuyen tren
ray):
T T 3 2 = S G + S L + S T (4)
Can true duoi tac dung ciia tai trgng thii tai:
42 Dieo-ng Tnedng Giang, Phgm Quang Dimg, Trdn Nhat Dimg
T T 3 3 = S G + PIM^SL hoac
T T 3 3 = S G + P2SL (5)
trong do Pl =1,1 trong truang hgp thu tai dgng, p2 = 1,25 trong truong hgp thii tai tTnh.
2.2. Kiim tra kit cdu
Trong tieu chuan khong quy djnh viec kiem tra chuyen vj eiia ket ciu ma chi quy djnh tinh toan ung suat trong ket cau va kiem tra theo phuong phap ii'ng suat cho phep. Viec kiem tra dam bao dii ben on djnh vai be so an toan doi voi cac truang hgp tai trgng I, II, III.
Trong truang hgp ket cau co do manh lan khi lam viec chiu bien dang Ion lam thay doi gia trj lue tae dung vao ket cau, TCVN 4244-2005 quy djnh phuong phap tinh toan kiem tra nhu sau:
1. Kiem tra trong cac truang hgp tai trgng I, II va 111 dam bao ling suat nho hon iing suat cho phep (theo dieu kien ben, on djnh).
2. Kiem tra tiep theo cung dugc thuc hien bang each tinh toan cae ung suat gay ra do tae diing ciia tai trgng dugc nhan vai he so an toan v eua truang hgp tai trgng xet den va eo xet den bien dang gay ra boi tac dimg eua tai trgng da duge tang len dam bao ung suat nho bon iing suat tai han (theo dieu kien ben, on djnh). Viec kiem tra bang each xem xet hai truang hgp :
- Khi tae dgng cua trgng lugng ban than SG va cae tai trgng biin doi Sv (vj^St, SH, S„, ^mm^) dan tai bien dang nguge buong thi viec kiem tra can dain bao dieu kien
<^gay boi ( S G + v . S v ) < On, ( 6 )
- Khi tac dgng eiia trgng lugng ban than SG va cae tai trgng biin dii Sv (V|7SL, SH, S „ , Swmnx) dan tai bien dang cung huong thi viec kiem tra can dam bao dilu kien.
CTi;aybc,i(vSG+V.Sv)<a,h (7)
v ' = R ( v - l ) r (8) a,. , ,
r = — (du'o'c tinh a giai doan dau eiia bien dang) (9) Cac he so duo'c lay nhu sau:
- v=] ,55 cho truong hgp tai trong 1;
- v= 1,33 cho truang hgp tai trong II;
- v= 1,1 eho truang hgp tai trgng III.
3. Tinh toan ket cau thep can true thap theo TCVN 4244-2005
Quy trinh tinh toan kit cau thep can true thap theo tieu chuin TCVN 4244-2005 dugc thiit lap eho a hinh 3. Doi tugng nghien cuu dl xay dung chuong trinh la loai cin true thap duge sii dyng pho bien nhat hien nay can true thap loai diu quay voi can nim ngang thay doi tim voi bang xe eon cap keo co dac tinh ky thuat nhu hinh 1.
3.L Nhdm tdi trgng tinh todn thiet ki
Ket cau thep can true thap phai tinh toan kiim tra trong trang thaiiam viec va khong lam viec, theo quan he tuong doi giiia cin va thap, dilu kien lip dat chiing toi thiy cin phai tinh toan trong toi thieu 04 so' do nhu sau:
- So d6 Al: cin true thap eao nhit diing tu do va cin vuong goe voi canh thap
Tinh todn thiit ki kit cau thep cdn true thdp xdy dung theo TCVN 4244-2005 43
Sa do A2: can true thap cao nhat diing tu do va can theo duong cheo thap
So d l Bl: can true thap cao nhat giang vao ket eau cong trinh va cin vuong goc voi canh thap
So do B2: can true thap eao nhat giang vao ket eau cong trinh va cin theo duang cheo thap
R(m)
Hinh 1: So do dac tinh ky thuat can true thap
Tai trgng nang thay doi theo tain vai va gia trj tai trgng do vat nang dirge xac djnh tu duang dac tinh tai trgng, do do tuo'ng ii'ng tam vai khac nhau thi tai trgng tac dung vao ket can la khac nhau. Xac dinh eae vj tri tai trgng tuo'ng ii'ng tam voi phu thuge vao nhieu yeu to nhu so thanh neo can, duong dae tinh tai trgng, tam voi Ion nhat... de xac djnh chinh xac la viec rat kho khan.
Vdi can true thap loai dau quay cd 2 thanh neo can va eo dudng dae tinh tai trgng dien hinh nhu hinh 1 chiing toi de xuat sii' dung 7 vj tri tai trgng tren can tuo'ng ung cae vj tri ed the gay nguy hiem cho chdt chan can, thap, can,neo can:
Bang 1: Cae vi tri tai trong tren can Tam
vdi RI R2 R3 R4 R5 R6 R7
Vj tri tai tren can Tam vdi nho nhat R|= Rmin , tai trgng Qmax Vi tri giua chot chan can va vi trf neo can thu nhat Vj tri tren can co mo men tai la Ion nhat M=R3. Qmax Vi tri neo can thu nhat
Vj tri giua neo can thu nhat va thu 2 Vi tri neo can thu hai
Tam voi Ion nhat R7= Rmax, tai trong Qmin
Muc dich Kiem tra chot chan can Kiem tra can
Kiem tra thap
Kiem tra neo can, dau thap Kiem tra can
Kiem tra neo can, dau thap . Kiem tra can, kiem tra thap Tu dae diem lam viec nay ciia can true ap dung eae quy djnh ciia tieu chuan chiing toi chia ra cac nhom tai trong co ban eho mdt so dd tinh nhu sau:
44 Dieang Tnedng Giang, Pham Quang Dung, Trdn N'nii Dung
- Dac tinh ky thuat can true - Kieu dang ket cau, chon ki'ch thirde hinh hoc, tiet dien
i r
Xac djnh so do, trang thai tinh toan cua can true
• "
Xac djnh cae vi tri tai trgng tren can hoac tam vdi tinh
• "
Tinh cae tai trgng theo trang thai can true
1 r
Thiet lap cae td hgp tai trgng co ban khong ke den bien dang va
tinh ndi lire
J -
Thiet lap cac td hgp tai trgng CO ban xet den bien dang
\ a tinh ndi lue
Klidng dat
Khdna dat
Hinh 3: Quy trinh tinh toan ket cau thep can true thaptheo TC\7\4244- 2005 Cac tai trgng thudng xuyen
- Trgng lugng ban than ket cau va cae bd phan dat tren nd SG
- Tai trgng dgng khi nang vat gom n nhdm tai QRi (i = R n) vdi n sd \ j tri tai trgng nang tren can.
- Tai trgng do cae lire quan tinh \ a 1\' tam SH gdm: tai trgng dgng khi quay ciia vat nang gdm n nhdm tai TDR, ;tai trgng dgng khi quay ciia trgng lugng ban than ket eau va cac bd phan dat
Tinh todn thiit ki kit cau thep cdn true thdp xdy dung theo TCVN 4244-2005 45
tren nd TD;tai trgng ly tam ciia vat nang gdm n nhdm tai LTR,;tai trgng ly tam khi quay ciia trgng lugng ban than ket cau va cae bg phan dat tren nd LTQ.
Cac tai trgng khdng thudng xuyen ehi xet gid trong trang thai lam viec Swglm:
- Tai trgng gid tac tiling vao tai trgng nang trong trang thai lam viec phuong song song vdi can gom n nhom tai WQSRj
- Tai trgng gid tac dung vao may trong trang thai lam viec phuong song song vdi cin WSL - Tai trgng gid tac dung vao tai trgng nang trong trang thai lam viec phuong vudng gdc vdi
can gom n nhdm tai WQVRj
- Tai trgng gid tac dung vao may trong trang thai lam viec phuong vudng gdc vdi can WVL Cac tai trgng bat thirdng
- Tai trgng thii tai gdm m nhdm tai QRT^ = Pi-QRk (k = 1 ^ m), vdi m- sd vj tri thu tai tren can - Tai trgng gid tae dung vao may trong trang thai khong lam viec Sv/ma.x la WKLV
Do dd vdi can true thap tinh toan ma vj tri tai trgng tren can n=7, vj tri thu tai m= 2 va cd dudng dae tinh tai trgng nhu hinh 1 can thiet phai tinh tdi thieu 43 nhdm tai trgng trong mgt so do tinh.
3.2. To hop tdi trgng vd phirong phdp kiem tra kit can thep cdn true thdp xet din bien thing Idn
Theo tieu chuan TCVN 4244-2005 thi ket eau can true thap phai kiem tra trong 3 trudng hgp tai trgng co ban la can true lam viec khdng ed gid, can true lam viec co gio va trudng hgp tai trgng bat thudng. Rd rang la d moi trirdng hgp nay phai tinh rat nhieu to hgp tai trgng khac nhau do phu thude vao trang thai can true, sd vi tri tai tren can, hudng gio.
Trudng hgp tai trgng I bieu dien theo cong thiie (1) so td hgp tai trgng bang sd vj tri tai trgng tren can n, trudng hgp tai trgng II bieu dien theo cdng thiic (2) xet den kha nang 2 phuang gid khac nhau thi sd to hop tai trgng bang 2n, trudng hgp tai trgng III (khi can true diing ed djnh) bieu dien theo cdng thiie (3).va (5) sd td hgp tai trgng phai xet bang m vj tri thu tai va 01 to hgp tai trgng trong trudng hgp can true khong lam viec.Vdi loai can true pho bien ma n =7, m
=2 thi trong 01 so do phai tinh 24 td hgp tai trgng, nhu vay tdng cdng ea 04 so dd Al, A2, Bl, B2 phai tinh tdi thieu 96 td hgp tai trgng kiem tra ket eau ma chua xet den dac diem ket cau chju bien dang Idn.
Khi xet den yeu td ket cau chju bien dang Idn tieu chuan TCVN 4244-2005 tfnh toan bang each nhan them he sd an toan vdi nhdm tai trgng gay bien dang va tinh toan iing suat dudi tac dung ciia tai trgng dugc nhan them nay. Bdi vay ma ngoai cac to hgp tai trgng da neu tren phai xet rieng va thiet lap eae td hgp tai trgng de tfnh toan ke den yeu to nay, ta de rang nhan thay:
- Thdng thudng khi thiet ke can true thi trgng lugng ban than ket eau gay bien dang ngugc hudng vdi tac dung do tai trgng nang. Trong trang thai lam viec he sd an toan theo tieu chuan duge nhan vdi cae tai trgng bien ddi la v = 1,5 (trudng hgp tai trgng I), v = l,33 (trudng hgp tai trgng II), trong trang thai thii tai he sd an toan v = 1,1 (trudng hgp tai trgng III). Ta thay cac tai trgng biin ddi cd phuong ngang vuong goc vdi can anh hudng khong nhieu den su tang them ling suat theo phuong bien dang can true do do eo the bd qua va lay be so an toan la 1. Cae trudng hgp nay dugc kiem tra thoa man theo he thiie (6).
- Trong trang thai khdng lam viec thi trgng lugng ban than gay bien dang eung hudng vdi tai trgng gid, ket cau thep can true thap phai thoa man theo he thiic (7) va do do ap dung cong thiie (8), (9) tai trgng gid dirge nhan vdi he so an toan la v = 1,1 va trgng lugng ban than dugc nhan vdi he sd v = 1 +0,1 r, gia trj he sd r dugc tinh theo to hgp chua xet den bien dang
46 Dieong Tnedng Giang, Phgm Quang Dung, Trdn Nhdt Dung
' a° ^ /' = max
v^-
KW (10)
Vdi: Oi" - li'ng suit tai phin tu thu i do trgng lugng ban than gay ra
OiKVL - ling suit tai phin tu thu i duge tfnh d td hgp tai trgng d trang thai khdng lam viec trong trudng hgp tai trgng III khi chua xet tdi bien dang (to hgp nay bao gom nhom tai WKLV va trgng lugng ban than Sc).
Tren co sd phan tfch tren thi cac td hgp tai trgng cho tinh toan kit cau thep cin true thap cd xet tdi bien dang Idn chung tdi thiet lap nhu sau:
(11) TTl,=SG+TD+TDRi-f l,5.(QRi+LTRi);i = H n
TT21i=SG+TD+TDRi+l,33.(QR,+LTRi+ WSL); i = H n TT22i=SG+TD-HTDRi-fWVL+WQVR, -H,33.(QR, +LTRi); i ^ TT31 k = So-<-l, 1 .QRTK ; k= H m
TT33 = ( l + 0 , l r ) = 1,1. WKLV
1-^n
(12) (13) (14) (15) Bang 2: So sanh sd lugng tai trgng va to hgp tai trgng khi tfnh toan theo tieu chuan Gost 13994
-81 va TCVN 4244-2005 (khi ap dung cho cin true nhu hinh 1)
So lugng tai trong /I so' do tfnh Trudng hgp tai trgng yeu eau xet So to hgp tai trgng/lso' do
GOST 13994-81 36 02 34
TCVN 4244-2005 43 03 48
4. Chuong trinh chuyen dung tinh toan ket cau thep can true thap theo tieu chuan TCVN 4244-2005.
De xay dung chuong trinh chiing toi da nghien cuu tieu chuan va de ra quy trinh tmh toan ket cau thep can true thap (hinh 3) lam co sd thiet lap thuat toan va lap trinh. Khi thiit lap lai chuong trinh nay chung toi da phai xay dung lai thuat toan va lap trinh phin tinh toan tai trgng, nhom tai trgng, td hgp tai trgng, kiem tra ket eau. Cae tai trgng duge chuong trinh chia mac djnh thanh 43 nhom tai rieng biet va 48 to hgp tai trgng eho mdt so dd tinh (24 to hgp khdng xet din bien dang, 24 to hgp xet den biin dang) nhu da neu tren, eho phep thay doi he sd lien quan den nhom tai va td hgp tai (hinh 4).Dae biet d day khac vdi chuong trinh cu thi tai trgng gid duge tu dgng tinh toan va dat vao so do tfnh ma khong phai tuang tac true tilp tren man hinh dd boa.
Chuong trinh chuyen dung dl tinh toan kit cau thep cin true thap theo TCVN4244-2005 (vdi ten ggi Cranevn VI.02) duge l|p trinh vdi ngdn ngu MS Visual C++, ndi lire tinh bing phirong phap phan tii huu ban, ed diy dii cae uu diim ma chuong trinh cu da ed [1]. Co giao dien than thien hoan toan tieng Viet, cd he thong Menu, Toolbar tien dung, don gian, d l sir dung, eho ket qua tinh nhanh, ggn, true quan va dl hieu. Do la chuang trinh dung rieng cho tinh toan thiet ke ket eau thep can true thap nen qua trinh tinh toan duge tu ddng boa mgt each toi da (tu sinh can true thap, tinh tai trgng ya t l hgp tai trgng, tinh kiim tra... ), ngoai ra chuang trinh cho phep lien kit vdi mdt sd phin mlm khac nhu Autocad, Exel, Sap. Chuong trinh Cranevn da tu dgng boa toi da viec xu ly ket qua tinh.Kit xuit s6 lieu va kiim tra danh gia ngay kha nang
Tinh todn thiit ki kit cdu thep cdn true thdp xdy dimg theo TCVN 4244-2005 47
lam viec cua tirng phan tii. Xuat eae gia trj ndi luc Idn nhat - nho nhat, ehuyin v j Idn nhat - nho nhit, ung suat Idn nhat - nhd nhat cua toan ket eau bay bg phan ket cau.Kiem tra eae phan tir theo su lira chgn bat ky ciia ngudi su dung tren so do ket cau.Tim ddi tugng, vj trf cac phan tir CO noi lire va chuyen vj can quan tam tren so dd ket cau.Vdi kha nang ket xuat tren Cranevn mang lai nhieu tien ich cho ngudi sir dung eho phep xac djnh, danh gia nhanh chdng ket qua tinh can quan tam
Hinh 4: Phat sinh to hgp tai trgng chuong trinh chuyen dung tinh toan ket eau thep can true thap Cranevn theo TCVN 4244-2005
Chimg tdi da tiln hanh tfnh toan thir nghiem can true thap ViCOX CTM - 80 bang ehirong trinh chuyen dung tfnh toan ket eau thep can true thap theo tieu chuan GOST 13994-81, theo tieu chuin mdi TCVN 4244-2005 va so sanh vdi ket qua tinh ciia de tai thiet ke che tao can true thap - Bg xay dirng (Bang 3). Kit qua cho thiy tieu ehuin TCVN 4244-2005 co luc dgc l^nh Idn ho'n, yeu eau eao hon tieu chuan GOST 13994-81.
Bang 3: So sanh mgt sd kit qua khi tfnh theo GOST 13994-81 va TCVN 4244-2005 (so dd Al va A2)
Luc dgc
Luc dgc Idn nhat tai can (tan), thanh hop 85x85x10
Lire dgc Idn nhat bien thap (tin), thanh L175xl75xl5)
Theo dl tai RDN 14-01 [5] .
40,46 63,79
Theo Cranevn GOST 13994-81
41,08 66,7
Theo Cranevn TCVN 4244-2005
41,5 71,26
48 Duong Tnedng Giang, Phgm Quang Dimg, Trdn Nhdt Dimg
5.Ket luan
Qua tinh toan bing chuong trinh chuyen dung tinh toan ket eau thep cin true thap va phan tich neu tren ebo thay TCVN 4244-2005 cd yeu ciu eao hon tieu ehuin GOST 13994-81.
Chuong trinh chuyen dung tinh toan'ket cau thep can true thap Cranevn xay dung theo tieu chuin TCVN 4244-2005 dap iing dugc nhu cau da dang eua thue t l nhu thiit kl mdi, thiet ke cai tao, thim djnh thiet ke, hge tap nghien cuu giiip qua trinh tfnh toan duge nhanh ggn, chinh xac Chuong trinh ed tinh md, co the can thiep duge vao chuong trinh de thay doi, dieu chinh theo nhung yeu eau va quy djnh rieng khi can thiet'
Tai lieu tham khao
[1] . Pham Quang Dung, Tran Nhat Dung, Duong Truong Giang 'Phdn mim chuyin dung tinh todn kit cdu thep cdn true thdp " Tuyen tap Hdi nghi khoa hoc todn qudc vi Ca ki thudl vd Tu ddng hda , 10/2006, Hoi CO hoc va Trudng Dai hoc Bach khoa, trang 85H- 98
[2].TCVN 4244-2005: Thiit bi ndng thiit kl chi tgo, kiim dinh [3]. FEM 1.001(10.1998): Rules for the design of hoisting appliances [4]. fOCT 13994-81: Kpauu dauienubie cmpoume-bubie
[5]. Bao cao tong ket de tai NCKH ma so RDN 14 - 01 Nghien cieu thiit ki chi tgo cdn true thdp. Bp Xay dung 2006.
[6]. Tran Nhat Dung. Chuang trinh tinh todn kit cdu khdng gian bdng phicang phdp phdn tic hieu hgn Vn3D. Cong ty tin hpc Hai Hoa
[7]. Trucng Quoc Thanh, Pham Quang Dung. Mdy vd thiit bi ndng. Nha xudt ban KH-KT Ha noi 2004
