# TT M“NG C»ŒC

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TCVN 5574/1991 Mac Betong Rn(KG/cm2) Rk(KG/cm2) 150 65 6 200 90 7.5 250 110 8.8 300 130 10 350 155 11 400 170 12 500 215 13.5 600 250 14.5

Ao 0.428 0.428 0.412 0.412 0.399 0.399 0.385 0.365

ao 0.62 0.62 0.58 0.58 0.55 0.55 0.52 0.48

Eb(KG/cm2) 210,000 240,000 265,000 290,000 310,000 330,000 360,000 380,000

Loai thep Ra(KG/cm2)Ra(KG/cm2) AI 2100 1680 AII 2800 2240 AIII 3600 2880 CI 2000 1600 CII 2600 2080 CIII 3400 2720 CIV 5000 4000

Ea(KG/cm2) Gii han chay(KG/cm2) 2,100,000 2400 2,100,000 3000 2,100,000 4000 2,100,000 2000 2,100,000 2600 2,000,000 3400 2,000,000 5000

TNH TOAN O LUN CHO MONG COC BTCT. TEN MONG: M1

Mo hnh tnh toan o lun la na khong gian bien dang tuyen tnh vi ha mong en o sau tai o ng suat gay lun bang 20% ng suat do trongCong thc tnh o lun n

S =i =1

e1i e2i h 1e 1i i

ng suat gay lun tai trong tam e mong :

gl 0= tc h i i z= tbTrong o : s tctb higi Bmq Lmq gmq Vay sgl z =0

= 35.76 (T/m2) = 25.7 (T/m2) = 2.37 (m) - Be rong mong khoi quy c. = 2.37 (m) - Chieu dai mong khoi quy c. = 0.88 (T/m3) -Dung trong at ay mong khoi quy c. (co ke en ay noi khi lp at nam di mc nc = 10.01 (T/m2)

Chia chieu day lp at thanh cac lp co chieu(m) hi = Bmq/5 = 0.47 day BANG TNH NG SUAT DO TRONG LNG BAN THAN VA TAI TRO s i gl = Ko x sz =0 gl 2) (T/m si IEM0 1 2 3 4bt

= g zigi h +

(T/m2)Ko 1.000 0.960 0.800 0.606 0.449 igl

z(m) Lmq/Bmq 2*z/Bmq 0.00 0.47 0.95 1.42 1.89 1.00 1.00 1.00 1.00 1.00 0 0.4 0.8 1.2 1.6

i

bt

i

bt

/ i

gl

10.0 9.6 8.0 6.1 4.5

25.7 26.2 26.6 27.0 27.4

2.6 2.7 3.3 4.4 6.1

Vung hoat ong nen lun cua at nen lay en o sau z = 4.45m BANG TNH O LUN bt hi P1i LP AT(cm)1 47 2.575 2.616 2.595

gl 1.001 0.961

tb

gl

P2i 3.576

e1i 0.580

e2i 0.570

Si(cm) 0.30

0.981

2 3 4

47 47 47

2.616 2.657 2.657 2.699 2.699 2.740

2.637 2.678 2.720

0.961 0.801 0.801 0.607 0.607 0.449

0.881 0.704 0.528

3.518 3.382 3.248

0.577 0.576 0.000

0.569 0.569 0.000

0.24 0.21 0.00 0.75

TONG O LUN S (cm)

Ghi chu: 1. Cac gia tr ng suat trong bang tnh o lun co n v tnh ( KG/cm 2. Cac cong thc tnh :P 1i = bt bt i 1 i 2g l tb

=

igl gl 1 i 2

gl P 2i = P 1i tb

Ket luan : Ta co S < Sgh = 8cm, do o thoa man yeu cau bien dang

ang tuyen tnh vi han che quy c nen co chieu day t e 0% ng suat do trong lng ban than at gay ra.

g khoi quy c. am di mc nc ngam)

HAN VA TAI TRONG NGOAI

au z = 4.45m so vi e mong .

co n v tnh ( KG/cm2)

bien dang

TNH TOAN MONG COC BE TONG COT THEP

TNH KET CAU AI COC TEN MONG: M1 ng knh coc 0.25 (m) d= Vat lieu ai coc : + Be tong mac : , 200 Rn = 90 (KG/cm2) + Thep : CII , Ra = 2600 (KG/cm2) Kch thc mong: + Canh dai : 2.2 (m) + Canh ngan: 2.2 (m) Kch thc co cot: + Canh dai : 0.8 (m) + Canh ngan: 0.8 (m) I. CHON O CAO AI COC h : h = 1 (m) Ta co thap xuyen thung bao trum cac au coc nen kha nang x II. BANG TNH LC TAC DUNG LEN AU COC Q :

N tt M tt y Q= 2 n xi2 Tong so x i

M tt x xi 2 yi0.75 -0.75 0.9 0.9

yiNtt Mttx (T.m)2.8 2.8 2.8 2.8

y2i (m2)1.28 1.28 1.28 1.28

coc n8 8 8 8

(m2)1.28 1.28 1.28 1.28

V tr coc xd(m) yn(m)0.75 -0.75 0.75 -0.75

Mtty (T.m)33 33 33 33

Q (T)30.9 -11.0 31.3 -7.4

(T)79.7 79.7 79.7 79.7

III. TNH COT THEP AI COC Fa : 1. S o tnh : Xem ai coc la ban consol ngam tai mep cot con au t do tai mep 2. Tai tac dung: La phan lc cac au coc 3.Bang tnh toan :

Fa =

M 0 . 9 Rah O

(Vi ho = h -15cm)

Xet mat ngam M(T.m)Fa (cm2) Chon thep Fa (cm2)a (mm) theo phng S.thanh .knh (chon) Canh ngan 37.1 18.7 18 16 36.2 120 Canh dai37.1 18.7 18 16 36.2 120 .

THIET KE : KS. NGUYEN TRAN KHOA

TNH TOAN MONG COC BE TONG COT THEP

Yeu cau ky thuat : 1.au coc ngam vao ai coc toi thieu 15cm. ho = h -15cm

THIET KE : KS. NGUYEN TRAN KHOA

TNH TOAN MONG COC BE TONG COT THEP

nen kha nang xuyen thung khong co.

Ghi chu Coc bien Coc bien

au t do tai mep mong.

THIET KE : KS. NGUYEN TRAN KHOA

TNH TOAN MONG COC BE TONG COT THEP

THIET KE : KS. NGUYEN TRAN KHOA

KIEM TRA COT THEP DOC TRONG COC BTCT KHI VAN CHUYEN VA Cac thong so ve coc: + Chieu dai oan coc L= 10 (m) + Canh coc d= 25 (cm) + Be tong coc mac : 300 , Rn = 130 (KG/cm2) + Thep coc : CII , Ra = 2600 (KG/cm2) + S.thanh thep 1 canh coc : 2 + .knh thep doc trong coc : 16 I. KHI VAN CHUYEN COC: 1. S o tnh :dam n gian, goi ta tai v tr moc cau khi van chuyen 0.207L (L: chieu dai oan coc), nham tao momen goi va momen nhp ban 2. Tai trong q(T/m) :la trong lng ban than coc ke them he so o q = 1.5 (d/100)2 gbt = 0.23 (T/m) 3. Momen M(T.m) : M = 0.502 (T.m) 4. Dien tch cot thep can thiet Fa(cm2) : Fa = M / 0.9*Ra*ho = 1.073 (cm2) 5. Ket luan : am bao an toan khi van chuyen II. KHI LAP DNG COC: 1. S o tnh :dam n gian, goi ta tai v tr moc cau khi lap dng va coc 1 oan 0.297L (L: chieu dai oan coc), nham tao momen goi va mome 2. Tai trong q(T/m) :la trong lng ban than coc ke them he so o q = 1.5 (d/100)2 gbt = 0.23 (T/m) 3. Momen M(T.m) : M = 1.034 (T.m) 4. Dien tch cot thep can thiet Fa(cm2) : Fa = M / 0.9*Ra*ho = 2.209 (cm2) 5. Ket luan : am bao an toan khi lap dng

THIET KE:KS.NGUYEN TRAN KHOA

CHUYEN VA LAP DNG

khi van chuyen. V tr moc cau cach moi au coc 1 oan momen nhp bang nhau em he so ong khi van chuyen la 1.5

khi lap dng va v tr dng coc. V tr moc cau cach au n goi va momen nhp bang nhau em he so ong khi van chuyen la 1.5

THIET KE:KS.NGUYEN TRAN KHOA

TNH TOAN MONG COC TEN MONG : M1 I.- XAC NH S BO KCH THC AI COC - Lc doc tnh toan tai co mong Ntto = 70 (T) - Sc chu tai cua coc c chon e tnh mong Qc = 50.6 (T) - Dung trong trung bnh at va be tong mong(T/m3) 2 g - o sau chon mong D 1.1 (m) - Tong chieu dai coc L 4 (m) - Canh coc d = 25 (cm) - Khoang cach cac coc bo tr trong ai la 3d (m) 0.8 = - Ap lc dnh gia nh do phan lc au coc gay ra: Ptt = Qc / ( 3d)2 = 89.9 (T/m2) - Dien tch s bo ai coc : F = Ntto /(Ptt -1.1g tb Df)= 0.8 (m2) - Trong lng cua ai va at tren ai : N = 1.1F Df gtb = 1.9 (T) - Lc doc tnh toan tai cao trnh ay ai Ntt : Ntt = Ntto + N = 71.9 (T) II.- XAC NH SO LNG COC nc & BO TR HE COC TRONG AI. nc = 1.2*Ntt /Qc = - So coc chon: - nhx= - nhy= - L= - B= 1.7 (coc) 8 (coc) 3 (So hang coc theo phng x) 3 (So hang coc theo phng y) 2.0 (m - Canh dai cua ai mong) 2.0 (m - Canh ngan cua ai mong)

- Dien tch thc cua ai sau khi bo tr he coc (m2): F = 4 - Trong lng cua ai va at tren ai : Nt = 1.1F Df gtb = 9.7 (T) - Lc doc tnh toan tai cao trnh ay ai Ntt : Ntt = Ntto + Nt = 79.7 (T) - Momen tnh toan tai tam ay ai Mtt : Mtt y= 33.0 (Tm) tt M x= 2.8 (Tm) III.- KIEM TRA TAI TRONG TAC DUNG LEN COC Lc truyen xuong 1 coc hang bien: Qttmax= Ntt /nc + Mtty* xmaxnen/ x2i+ Mttx* ymaxnen/ y2i Qttmin= Ntt /nc - Mtty* xmaxnen/ x2i- Mttx* ymaxnen/ y2i

THIET KE:KS. NGUYEN TRAN KHOA

Trong o : xmaxnen = ymax nen 2 2

0.75 (m) - khoang cach t tam hang coc chu nen l

=

0.75 (m) - khoang cach t tam hang coc chu nen l

x i= y i= Vay Q Qtt tt max min

1.28 (m) - Tong bnh phng khoang cach theo phng x 30.94 (T)

1.28 (m) - Tong bnh phng khoang cach theo phng y

= =

-11.02 (T) Ta co :Qttmax > Qc .Nen dieu kien kiem tra khong thoa man III.- KIEM TRA ON NH NEN DI MONG KHOI QUY C. Bang tnh goc ma sat trong trung bnh. h hi * j jtb (o) Lp at i (m) j (o) 2 8 17.27 ### 17.6 3 2 18.84 37.680 0 0 8.59 0.000 0 0 27.99 0.000 Tong 10 ### Ghi chu: hi : chieu day cua lp at th i tnh t ay ai mong. Goc truyen lc : a = jtb /4 =4.4 (o) Chieu dai ay mong khoi quy c Lmq = (L - d) + 2Lp tga = 2.37 (m) ( Canh dai mong L: .0 (m) ) 2 Chieu rong ay mong khoi quy c Bmq = (B - d) + 2Lp tga = 2.37 (m) ( Canh ngan mong B: (m) ) 2 Dien tch ay mong khoi quy c : Fmq = 5.59 (m2)

Xac nh trong lng mong khoi quy c: h hi T.lng lp i ( T) g Lp at i (m) g (T/m3) 1 3 2 6 33.6 2 8 1.97 15.74 80.2 3 2 2.01 4.01 20.4 0 0 0.86 0 0.0 0 0 0.88 0 0.0 Tong 25.7 134.1 Ghi chu: lp at th 1 tnh t ay ai mong tr len va dung trong la dung t la 2 T/m3.THIET KE:KS. NGUYEN TRAN KHOA

Trong lng ban than he coc: Nc = 5 (T) Trong lng mong khoi quy c : Nmq = 139.1 (T) Lc doc tieu chuan tam ay mong khoi quy c: Ntcmq = 200 (T) Momen tieu chuan tam ay mong khoi quy c: Mtcmq = Mtco + Qtco (cao trnh ay MKQ -cao trnh nh ai) Mtcmq = 169 (T.m) o lech tam tieu chuan e = 0.84 (m) Ap lc tieu chuan ay mong khoi quy c: smax = ### (T/m2) smax = ### (T/m2) stb = 35.76 (T/m2)R tc = m1 m2 n AB mq mq B 1 hi i Dc k tc

Cng o tieu chuan cua at nen di mong khoi quy c :mq

Trong o : m1 m2 ktctc

= = =

1.3 1.1 1

(V cac ac trng lay t phong th nghie

j =jmq=

18.84 0 A, B, D : cac he so phu thuoc jtc A = 0.465 B = 2.861 D = 5.454 Be rong mong khoi quy c : Bmq = 2.37 (m) Dung trong at ay mong khoi quy c gmq = 0.88 (T/m3) (hi x g i) = cmq

25.7 (T/m3)

0.28 (T/m2) Rtc = 108.92 (T/m2) Ket luan : Khong thoa man

=

THIET KE:KS. NGUYEN TRAN KHOA

Yeu cau ve cach bo tr coc : - Khoang cach gia cac truc coc l - oi vi mong nha khoang cach t

COC TRONG AI.

THIET KE:KS. NGUYEN TRAN KHOA

hang coc chu nen ln nhat theo phng x en tam ai

hang coc chu nen ln nhat theo phng y en tam ai

ng cach theo phng x t tam cac hang coc en tam ai

ng cach theo phng y t tam cac hang coc en tam ai

khong thoa man HOI QUY C.

dung trong la dung trong trung bnh gia at va be tong

THIET KE:KS. NGUYEN TRAN KHOA

ong khoi quy c :

y t phong

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