thuyet minh tinh mong cau thap dai coc

THUYT MINH TNH TON MNG CU THP.

I./ Cn c thit k:

I.1/ Bn v:

B bn v thit k kt cu, kin trc D n xy dng 2.220 cn h ti nh c (khu 1), phng Bnh

Khnh, qun 2, khu th mi Th Thim c Ch u t Lin danh Vietinbank -Thun Vit - Coseco -

Cofico - Trng Sn ph duyt ngy 19/2/2013 .

I.2/ Cc quy phm v tiu chun thit k:

- Ti trng v tc ng - Tiu chun thit k : TCVN 2737 : 1995

- Ch dn tnh ton thnh phn ng ca ti trng gi

theo tiu chun TCVN 2737 1995 : TCXD 229 : 1999

- Tiu chun thit k nn nh v cng trnh : TCVN 9362 : 2012

- Kt cu b tng v b tng ct thp - Tiu chun thit k : TCXDVN 356 : 2005

- Tiu chun thit k kt cu thp : TCXDVN 338 : 2005

- Mng cc Tiu chun thit k : TCXD 205 : 1998

II./Cc thng s cu thp tnh ton:

Thng s cu thp i din tnh ton:

Tr thp: kch thc L x W x H = 1600x1600 x2500

Thanh ng: L 160x160x10

Thanh ging ng: L 100x100x8

Cn thp:

Thanh ngang: L 100x100x8

Thanh ging ngang: L 75x75x6

Bn knh cu ln nht s dng: Rmaxsd = 55 (m)

Trng lng ti trng cu ng vi trng hp Rmaxsd : Q = 1,6 (T)

Trng lng ti trng cu ln nht: Q = 8.0(T)

Bn knh tng ng ti trng cu ln nht: Rmax = 13,5 (m)

Bn knh ui cn cu: R = 14,3 (m)

III./M HNH, TI TRNG & T HP TI TRNG TNH MNG CU THP TRONG ETABS:

III.1/ Cc trng hp ti v cc t hp ti trng Cc trng hp ti:

1. Ti trng bn thn cu thp 2. Hot ti s dng. 3. Gi tri theo phng X. 4. Gi phi theo phng X. 5. Gi tri theo phng Y. 6. Gi phi theo phng Y.

Cc t hp ti trng: Trng hp 1: tnh ti + hot ti Trng hp 2: tnh ti + hot ti + gi tri phng X Trng hp 3: tnh ti + hot ti + gi phi phng X Trng hp 4: tnh ti + hot ti + gi tri phng Y Trng hp 5: tnh ti + hot ti + gi phi phng Y Trng hp 6: tnh ti + gi tri phng X Trng hp 7: tnh ti + gi phi phng X Trng hp 8: tnh ti + gi tri phng Y Trng hp 9: tnh ti + gi phi phng Y

5,2

M

M

5,2

M

M

4,0

M 4,0

M

III.2/ Cc c s tnh ton thit k cng trnh. III.2.1/ M hnh tnh : m bo tnh ton chnh xc lc tc dng xung cc cc ca cng trnh, y s dng m hnh tnh ton h kt cu khung khng gian ngm vo h mng cc.

III.2.2/ Tnh ton trn my tnh: S dng phn mm tnh ton kt cu ETABS V 9.0.7.Vic tnh ton cc cu kin c ly ni lc t m hnh trn ETABS, cch tnh tun theo cc cng thc v quy phm Vit Nam hin hnh.

III.3/ Xc nh ti trng do gi:

III.3.1/ Ti trng do gi tnh gy ra theo phng X:

Tnh ton theo cng thc: Q

tt = qo

tc x n x c x k x B

Ti trng gi tiu chun vng: IIA qo

tc = 83 KG/m

2 : Gi tr p lc gi tiu chun.

n = 1,2 H s tin cy.

Din tch n gi 2x 0,16x1 1,6x0,1 1,887x0,1 0,67iA Din tch gii hn bi ng bao ngoi: A = 1,6 H s kh ng Ct

1(1 )t xC C k , vi 1 1,4 0,67

0,5861,6

x xi iC C AA

0,586 (1 0,95) 1 1,143tC : H s kh ng.

K: H s k n nh hng ca cao n ti trng gi. B = Ai = 0,67 (m

2) Din tch n gi ca cc thanh thp tr thp.

Loi a hnh n gi : A Kt qu tnh ton cho bng sau:

Cao qotc Cao c k B

Qtc

(Kg/m2) Fx (KG)

(m) Kg/m2 Htt(m)

1 83 1 1,143 1,000 0,67 94,87 76,275

2 83 1 1,143 1,000 0,67 94,87 76,275

3 83 1 1,143 1,000 0,67 94,87 76,275

4 83 1 1,143 1,035 0,67 98,19 78,944

5 83 1 1,143 1,070 0,67 101,51 81,614

6 83 1 1,143 1,092 0,67 103,60 83,292

7 83 1 1,143 1,114 0,67 105,68 84,970

8 83 1 1,143 1,136 0,67 107,77 86,648

9 83 1 1,143 1,158 0,67 109,86 88,326

10 83 1 1,143 1,180 0,67 111,95 90,004

11 83 1 1,143 1,192 0,67 113,08 90,919

12 83 1 1,143 1,204 0,67 114,22 91,835

13 83 1 1,143 1,216 0,67 115,36 92,750

14 83 1 1,143 1,228 0,67 116,50 93,665

15 83 1 1,143 1,240 0,67 117,64 94,581

16 83 1 1,143 1,250 0,67 118,59 95,343

17 83 1 1,143 1,260 0,67 119,53 96,106

18 83 1 1,143 1,270 0,67 120,48 96,869

19 83 1 1,143 1,280 0,67 121,43 97,632

20 83 1 1,143 1,290 0,67 122,38 98,394

21 83 1 1,143 1,298 0,67 123,14 99,005

22 83 1 1,143 1,306 0,67 123,90 99,615

23 83 1 1,143 1,314 0,67 124,66 100,225

24 83 1 1,143 1,322 0,67 125,42 100,835

25 83 1 1,143 1,330 0,67 126,18 101,445

26 83 1 1,143 1,338 0,67 126,93 102,056

27 83 1 1,143 1,346 0,67 127,69 102,666

28 83 1 1,143 1,354 0,67 128,45 103,276

29 83 1 1,143 1,362 0,67 129,21 103,886

30 83 1 1,143 1,370 0,67 129,97 104,496

31 83 1 1,143 1,376 0,67 130,54 104,954

32 83 1 1,143 1,382 0,67 131,11 105,412

33 83 1 1,143 1,388 0,67 131,68 105,869

34 83 1 1,143 1,394 0,67 132,25 106,327

35 83 1 1,143 1,400 0,67 132,82 106,785

36 83 1 1,143 1,406 0,67 133,39 107,242

37 83 1 1,143 1,412 0,67 133,96 107,700

38 83 1 1,143 1,418 0,67 134,52 108,157

39 83 1 1,143 1,424 0,67 135,09 108,615

40 83 1 1,143 1,430 0,67 135,66 109,073

41 83 1 1,143 1,434 0,67 136,04 109,378

42 83 1 1,143 1,438 0,67 136,42 109,683

43 83 1 1,143 1,442 0,67 136,80 109,988

44 83 1 1,143 1,446 0,67 137,18 110,293

45 83 1 1,143 1,450 0,67 137,56 110,598

46 83 1 1,143 1,454 0,67 137,94 110,903

47 83 1 1,143 1,458 0,67 138,32 111,208

III.3.2/ Ti trng do gi ng gy ra theo phng X:

Tnh tan cho dng dao ng th : 1 Tn s f1 = 0,415 Lai a hnh n gi: A Thnh phn ng ca ti trng gi tnh ton theo cng thc: Wp(ij) = Mj * i * i * ij Mj : Khi lng tp trung ca phn t th j i : H s ng lc ng vi dao ng th i, khng th nguyn ij : Chuyn v ngang t i ca trng tm phn cng trnh th j i vi dao ng th I i : H s khng th nguyn

Xc nh WFj theo cng thc: WFj = Wj * j * * Dj * hj Wj : Ti trng gi tnh j : H s p lc ng ca ti trong gi Dj : B rng n gi tng th j hj : Chiu cao n gi tng th j D = 1,6 (m) Chiu rng cng trnh H = 47 (m) Chiu cao cng trnh = 0,75 H s tng quan khng gian ca ti trng gi. Bng xc nh thnh phn ng WFj

Cao Wj (Kg/m2) i Dj hj WFj (KG)

(m) (m) (m)

1 94,87 0,318 0,750 1,60 1,00 36,202

2 94,87 0,318 0,750 1,60 1,00 36,202

3 94,87 0,318 0,750 1,60 1,00 36,202

4 98,19 0,318 0,750 1,60 1,00 37,469

5 101,51 0,318 0,750 1,60 1,00 38,736

6 103,60 0,315 0,750 1,60 1,00 39,160

7 105,68 0,312 0,750 1,60 1,00 39,568

8 107,77 0,309 0,750 1,60 1,00 39,962

9 109,86 0,306 0,750 1,60 1,00 40,340

10 111,95 0,303 0,750 1,60 1,00 40,703

11 113,08 0,302 0,750 1,60 1,00 40,927

12 114,22 0,300 0,750 1,60 1,00 41,147

13 115,36 0,299 0,750 1,60 1,00 41,364

14 116,50 0,297 0,750 1,60 1,00 41,576

15 117,64 0,296 0,750 1,60 1,00 41,785

16 118,59 0,295 0,750 1,60 1,00 41,923

17 119,53 0,293 0,750 1,60 1,00 42,057

18 120,48 0,292 0,750 1,60 1,00 42,189

19 121,43 0,290 0,750 1,60 1,00 42,317

n

j

jji

n

j

Fjij

i

My

Wy

1

2

1y

20 122,38 0,289 0,750 1,60 1,00 42,442

21 123,14 0,288 0,750 1,60 1,00 42,602

22 123,90 0,288 0,750 1,60 1,00 42,760

23 124,66 0,287 0,750 1,60 1,00 42,917

24 125,42 0,286 0,750 1,60 1,00 43,073

25 126,18 0,286 0,750 1,60 1,00 43,228

26 126,93 0,285 0,750 1,60 1,00 43,381

27 127,69 0,284 0,750 1,60 1,00 43,533

28 128,45 0,283 0,750 1,60 1,00 43,684

29 129,21 0,283 0,750 1,60 1,00 43,834

30 129,97 0,282 0,750 1,60 1,00 43,982

31 130,54 0,281 0,750 1,60 1,00 44,065

32 131,11 0,281 0,750 1,60 1,00 44,147

33 131,68 0,280 0,750 1,60 1,00 44,228

34 132,25 0,279 0,750 1,60 1,00 44,308

35 132,82 0,279 0,750 1,60 1,00 44,387

36 133,39 0,278 0,750 1,60 1,00 44,465

37 133,96 0,277 0,750 1,60 1,00 44,543

38 134,52 0,276 0,750 1,60 1,00 44,619

39 135,09 0,276 0,750 1,60 1,00 44,694

40 135,66 0,275 0,750 1,60 1,00 44,769

41 136,04 0,275 0,750 1,60 1,00 44,841

42 136,42 0,274 0,750 1,60 1,00 44,913

43 136,80 0,274 0,750 1,60 1,00 44,984

44 137,18 0,274 0,750 1,60 1,00 45,056

45 137,56 0,273 0,750 1,60 1,00 45,127

46 137,94 0,273 0,750 1,60 1,00 45,197

47 138,32 0,273 0,750 1,60 0,50 22,634

Bng xc nh thnh phn ng h s i

Cao Wpj Mj y1j y1j . Wpj y1j2

. Mj

(m) n (KG)

1 36,202 200 0,0012 0,04344 0,00029

2 36,202 200 0,0044 0,1593 0,0039

3 36,202 200 0,0095 0,3439 0,0181

4 37,469 200 0,0163 0,6107 0,0531

5 38,736 200 0,0249 0,9645 0,1240

6 39,160 200 0,0352 1,3784 0,2478

7 39,568 200 0,0471 1,8637 0,4437

8 39,962 200 0,0606 2,4217 0,7345

9 40,340 200 0,0757 3,0537 1,1461

10 40,703 200 0,0922 3,7528 1,7002

11 40,927 200 0,1101 4,5061 2,4244

12 41,147 200 0,1295 5,3286 3,3541

13 41,364 200 0,1501 6,2087 4,5060

14 41,576 200 0,1721 7,1553 5,9237

15 41,785 200 0,1952 8,1564 7,6206

16 41,923 200 0,2195 9,2020 9,6361

17 42,057 200 0,245 10,30401 12,00500

18 42,189 200 0,2715 11,4542 14,7425

19 42,317 200 0,299 12,6527 17,8802

20 42,442 200 0,3275 13,8997 21,4513

21 42,602 200 0,357 15,2087 25,4898

22 42,760 200 0,3872 16,5567 29,9848

23 42,917 200 0,4183 17,9523 34,9950

24 43,073 200 0,4502 19,3915 40,5360

25 43,228 200 0,4828 20,8704 46,6192

26 43,381 200 0,516 22,3847 53,2512

27 43,533 200 0,5499 23,9390 60,4780

28 43,684 200 0,5843 25,5247 68,2813

29 43,834 200 0,6193 27,1462 76,7065

30 43,982 200 0,6547 28,7950 85,7264

31 44,065 200 0,6906 30,4313 95,3857

32 44,147 200 0,7269 32,0905 105,6767

33 44,228 200 0,7635 33,7681 116,5865

34 44,308 200 0,8004 35,4643 128,1280

35 44,387 200 0,8376 37,1788 140,3148

36 44,465 200 0,875 38,9073 153,1250

37 44,543 200 0,9125 40,6452 166,5313

38 44,619 200 0,9502 42,3970 180,5760

39 44,694 200 0,988 44,1580 195,2288

40 44,769 229 1,0258 45,9237 240,9688

41 44,841 3544 1,0258 45,9977 3729,2294

42 44,913 146 1,1012 49,4579 177,0457

43 44,984 139 1,139 51,2371 180,3276

44 45,056 133 1,1768 53,0214 184,1861

45 45,127 127 1,2148 54,8198 187,4189

46 45,197 104 1,2528 56,6231 163,2288

47 22,634 83 1,291 29,2203 138,3345

1042,57061 6908,37597

H s i = 0,1509 Xc nh h s i: Ph thuc thng s i v gim loga ca dao ng

i = 0,081 = 0,15 Cng trnh hnh thp, tr thp. Tra thi xc nh h s ng lc i = 2,325

Bng ti trng gi ng gy ra theo phng X

Cao Mj i i y1j n Wpj

(m) KG

1 200 2,325 0,1509 0,00120 1,20 0,101

2 200 2,325 0,1509 0,00440 1,20 0,371

3 200 2,325 0,1509 0,00950 1,20 0,800

4 200 2,325 0,1509 0,01630 1,20 1,373

5 200 2,325 0,1509 0,02490 1,20 2,097

6 200 2,325 0,1509 0,03520 1,20 2,965

7 200 2,325 0,1509 0,04710 1,20 3,967

8 200 2,325 0,1509 0,06060 1,20 5,104

9 200 2,325 0,1509 0,07570 1,20 6,376

10 200 2,325 0,1509 0,09220 1,20 7,766

11 200 2,325 0,1509 0,11010 1,20 9,273

12 200 2,325 0,1509 0,12950 1,20 10,907

13 200 2,325 0,1509 0,15010 1,20 12,642

14 200 2,325 0,1509 0,17210 1,20 14,495

15 200 2,325 0,1509 0,19520 1,20 16,441

16 200 2,325 0,1509 0,21950 1,20 18,487

17 200 2,325 0,1509 0,24500 1,20 20,635

18 200 2,325 0,1509 0,27150 1,20 22,867

19 200 2,325 0,1509 0,29900 1,20 25,183

20 200 2,325 0,1509 0,32750 1,20 27,584

21 200 2,325 0,1509 0,35700 1,20 30,068

22 200 2,325 0,1509 0,38720 1,20 32,612

23 200 2,325 0,1509 0,41830 1,20 35,231

24 200 2,325 0,1509 0,45020 1,20 37,918

25 200 2,325 0,1509 0,48280 1,20 40,664

ioi fW 940

26 200 2,325 0,1509 0,51600 1,20 43,460

27 200 2,325 0,1509 0,54990 1,20 46,315

28 200 2,325 0,1509 0,58430 1,20 49,212

29 200 2,325 0,1509 0,61930 1,20 52,160

30 200 2,325 0,1509 0,65470 1,20 55,142

31 200 2,325 0,1509 0,69060 1,20 58,166

32 200 2,325 0,1509 0,72690 1,20 61,223

33 200 2,325 0,1509 0,76350 1,20 64,306

34 200 2,325 0,1509 0,80040 1,20 67,413

35 200 2,325 0,1509 0,83760 1,20 70,547

36 200 2,325 0,1509 0,87500 1,20 73,697

37 200 2,325 0,1509 0,91250 1,20 76,855

38 200 2,325 0,1509 0,95020 1,20 80,030

39 200 2,325 0,1509 0,98800 1,20 83,214

40 229 2,325 0,1509 1,02580 1,20 98,925

41 3544 2,325 0,1509 1,02580 1,20 1530,967

42 146 2,325 0,1509 1,10120 1,20 67,706

43 139 2,325 0,1509 1,13900 1,20 66,673

44 133 2,325 0,1509 1,17680 1,20 65,912

45 127 2,325 0,1509 1,21480 1,20 64,971

46 104 2,325 0,1509 1,25280 1,20 54,869

47 83 2,325 0,1509 1,29100 1,20 45,125

Bng tng hp ti trng gi tnh v gi ng tc dng ln cu thp theo phng X:

Cao

(m)

Tnh (Fx)-(KG)

ng (Wpj)-(KG)

Tnh + ng (T)

1 76,275 0,101 0,076

2 76,275 0,371 0,077

3 76,275 0,800 0,077

4 78,944 1,373 0,080

5 81,614 2,097 0,084

6 83,292 2,965 0,086

7 84,970 3,967 0,089

8 86,648 5,104 0,092

9 88,326 6,376 0,095

10 90,004 7,766 0,098

11 90,919 9,273 0,100

12 91,835 10,907 0,103

13 92,750 12,642 0,105

14 93,665 14,495 0,108

15 94,581 16,441 0,111

16 95,343 18,487 0,114

17 96,106 20,635 0,117

18 96,869 22,867 0,120

19 97,632 25,183 0,123

20 98,394 27,584 0,126

21 99,005 30,068 0,129

22 99,615 32,612 0,132

23 100,225 35,231 0,135

24 100,835 37,918 0,139

25 101,445 40,664 0,142

26 102,056 43,460 0,146

27 102,666 46,315 0,149

28 103,276 49,212 0,152

29 103,886 52,160 0,156

30 104,496 55,142 0,160

31 104,954 58,166 0,163

32 105,412 61,223 0,167

33 105,869 64,306 0,170

34 106,327 67,413 0,174

35 106,785 70,547 0,177

36 107,242 73,697 0,181

37 107,700 76,855 0,185

38 108,157 80,030 0,188

39 108,615 83,214 0,192

40 109,073 98,925 0,208

41 109,378 1530,967 1,640

42 109,683 67,706 0,177

43 109,988 66,673 0,177

44 110,293 65,912 0,176

45 110,598 64,971 0,176

46 110,903 54,869 0,166

47 111,208 45,125 0,156

III.3.3/ Ti trng do gi tnh gy ra theo phng Y:

Tnh ton theo cng thc: Q

tt = qo

tc * n * c * k * B

Ti trng gi tiu chun vng : IIA qo

tc = 83 KG/m

2 : Ga tr p lc gi tiu chun.

n = 1,2 H s tin cy. c = 1,143 : H s kh ng. K: H s k n nh hng ca cao n ti trng gi. B = 0,67 (m) Din tch n gi. Loi a hnh n gi : A Bng kt qu tnh ton gi tnh cho bng sau:

Cao qotc

Chiu di on c k B Qtc Fx

(m) KG/m2 Htt(m) m

2 (KG/m2) (KG)

1 83 1 1,143 1,000 0,67 94,87 76,275

2 83 1 1,143 1,000 0,67 94,87 76,275

3 83 1 1,143 1,000 0,67 94,87 76,275

4 83 1 1,143 1,035 0,67 98,19 78,944

5 83 1 1,143 1,070 0,67 101,51 81,614

6 83 1 1,143 1,092 0,67 103,60 83,292

7 83 1 1,143 1,114 0,67 105,68 84,970

8 83 1 1,143 1,136 0,67 107,77 86,648

9 83 1 1,143 1,158 0,67 109,86 88,326

10 83 1 1,143 1,180 0,67 111,95 90,004

11 83 1 1,143 1,192 0,67 113,08 90,919

12 83 1 1,143 1,204 0,67 114,22 91,835

13 83 1 1,143 1,216 0,67 115,36 92,750

14 83 1 1,143 1,228 0,67 116,50 93,665

15 83 1 1,143 1,240 0,67 117,64 94,581

16 83 1 1,143 1,250 0,67 118,59 95,343

17 83 1 1,143 1,260 0,67 119,53 96,106

18 83 1 1,143 1,270 0,67 120,48 96,869

19 83 1 1,143 1,280 0,67 121,43 97,632

20 83 1 1,143 1,290 0,67 122,38 98,394

21 83 1 1,143 1,298 0,67 123,14 99,005

22 83 1 1,143 1,306 0,67 123,90 99,615

23 83 1 1,143 1,314 0,67 124,66 100,225

24 83 1 1,143 1,322 0,67 125,42 100,835

25 83 1 1,143 1,330 0,67 126,18 101,445

26 83 1 1,143 1,338 0,67 126,93 102,056

27 83 1 1,143 1,346 0,67 127,69 102,666

28 83 1 1,143 1,354 0,67 128,45 103,276

29 83 1 1,143 1,362 0,67 129,21 103,886

30 83 1 1,143 1,370 0,67 129,97 104,496

31 83 1 1,143 1,376 0,67 130,54 104,954

32 83 1 1,143 1,382 0,67 131,11 105,412

33 83 1 1,143 1,388 0,67 131,68 105,869

34 83 1 1,143 1,394 0,67 132,25 106,327

35 83 1 1,143 1,400 0,67 132,82 106,785

36 83 1 1,143 1,406 0,67 133,39 107,242

37 83 1 1,143 1,412 0,67 133,96 107,700

38 83 1 1,143 1,418 0,67 134,52 108,157

39 83 1 1,143 1,424 0,67 135,09 108,615

40 83 1 1,143 1,430 0,67 135,66 109,073

41 83 1 1,143 1,434 31,2 160,68 6015,848

42 83 1 1,143 1,438 0,67 136,42 109,683

43 83 1 1,143 1,442 0,67 136,80 109,988

44 83 1 1,143 1,446 0,67 137,18 110,293

45 83 1 1,143 1,450 0,67 137,56 110,598

46 83 1 1,143 1,454 0,67 137,94 110,903

47 83 1 1,143 1,458 0,67 138,32 111,208

III.3.4/ Ti trng do gi ng gy ra theo phng Y:

Tnh tan cho dng dao ng th : 1 Tn s f1 = 0,415 Lai a hnh n gi: A Thnh phn ng ca ti trng gi tnh tan theo cng thc: Wp(ij) = Mj * j * i * ij Mj : Khi lng tp trung ca phn t th j i : H s ng lc ng vi dao ng th i, khng th nguyn ij : Chuyn v ngang t i ca trng tm phn cng trnh th j i vi dao ng th I i : H s khng th nguyn

Xc nh WFj theo cng thc:

n

j

jji

n

j

Fjij

i

My

Wy

1

2

1y

WFj = Wj * j * * Dj * hj Wj Ti trng gi tnh j H s p lc ng ca ti trong gi Dj B rng n gi tng th j hj Chiu cao n gi tng th j D = 1,6 (m) Chiu rng cng trnh H = 47 (m) Chiu cao cng trnh = 0,75 H s tng quan khng gian ca ti trong gi. Bng xc nh thnh phn ng WFj

Cao Wj (Kg/m2) i Dj hj WFj (KG)

(m) n (m) (m)

1 94,87 0,318 0,750 1,60 1,00 36,202

2 94,87 0,318 0,750 1,60 1,00 36,202

3 94,87 0,318 0,750 1,60 1,00 36,202

4 98,19 0,318 0,750 1,60 1,00 37,469

5 101,51 0,318 0,750 1,60 1,00 38,736

6 103,60 0,315 0,750 1,60 1,00 39,160

7 105,68 0,312 0,750 1,60 1,00 39,568

8 107,77 0,309 0,750 1,60 1,00 39,962

9 109,86 0,306 0,750 1,60 1,00 40,340

10 111,95 0,303 0,750 1,60 1,00 40,703

11 113,08 0,302 0,750 1,60 1,00 40,927

12 114,22 0,300 0,750 1,60 1,00 41,147

13 115,36 0,299 0,750 1,60 1,00 41,364

14 116,50 0,297 0,750 1,60 1,00 41,576

15 117,64 0,296 0,750 1,60 1,00 41,785

16 118,59 0,295 0,750 1,60 1,00 41,923

17 119,53 0,293 0,750 1,60 1,00 42,057

18 120,48 0,292 0,750 1,60 1,00 42,189

19 121,43 0,290 0,750 1,60 1,00 42,317

20 122,38 0,289 0,750 1,60 1,00 42,442

21 123,14 0,288 0,750 1,60 1,00 42,602

22 123,90 0,288 0,750 1,60 1,00 42,760

23 124,66 0,287 0,750 1,60 1,00 42,917

24 125,42 0,286 0,750 1,60 1,00 43,073

25 126,18 0,286 0,750 1,60 1,00 43,228

26 126,93 0,285 0,750 1,60 1,00 43,381

27 127,69 0,284 0,750 1,60 1,00 43,533

28 128,45 0,283 0,750 1,60 1,00 43,684

29 129,21 0,283 0,750 1,60 1,00 43,834

30 129,97 0,282 0,750 1,60 1,00 43,982

31 130,54 0,281 0,750 1,60 1,00 44,065

32 131,11 0,281 0,750 1,60 1,00 44,147

33 131,68 0,280 0,750 1,60 1,00 44,228

34 132,25 0,279 0,750 1,60 1,00 44,308

35 132,82 0,279 0,750 1,60 1,00 44,387

36 133,39 0,278 0,750 1,60 1,00 44,465

37 133,96 0,277 0,750 1,60 1,00 44,543

38 134,52 0,276 0,750 1,60 1,00 44,619

39 135,09 0,276 0,750 1,60 1,00 44,694

40 135,66 0,275 0,750 1,60 1,00 44,769

41 160,68 0,275 0,750 63,00 1,00 2085,364

42 136,42 0,274 0,750 1,60 1,00 44,913

43 136,80 0,274 0,750 1,60 1,00 44,984

44 137,18 0,274 0,750 1,60 1,00 45,056

45 137,56 0,273 0,750 1,60 1,00 45,127

46 137,94 0,273 0,750 1,60 1,00 45,197

47 138,32 0,273 0,750 1,60 0,50 22,634

Bng xc nh thnh phn ng h s i

Cao Wpj Mj y1j y1j . Wpj y1j2

. Mj

(m) n (KG)

1 36,202 200 0,0001 0,00362 0,00000

2 36,202 200 0,0003 0,0109 0,0000

3 36,202 200 0,001 0,0362 0,0002

4 37,469 200 0,0014 0,0525 0,0004

5 38,736 200 0,0025 0,0968 0,0013

6 39,160 200 0,0031 0,1214 0,0019

7 39,568 200 0,0047 0,1860 0,0044

8 39,962 200 0,0055 0,2198 0,0061

9 40,340 200 0,0075 0,3025 0,0113

10 40,703 200 0,0085 0,3460 0,0145

11 40,927 200 0,0109 0,4461 0,0238

12 41,147 200 0,0121 0,4979 0,0293

13 41,364 200 0,0148 0,6122 0,0438

14 41,576 200 0,0161 0,6694 0,0518

15 41,785 200 0,0192 0,8023 0,0737

16 41,923 200 0,0207 0,8678 0,0857

17 42,057 200 0,024 1,00937 0,11520

18 42,189 200 0,0257 1,0842 0,1321

19 42,317 200 0,0292 1,2356 0,1705

20 42,442 200 0,0312 1,3242 0,1947

21 42,602 200 0,0349 1,4868 0,2436

22 42,760 200 0,037 1,5821 0,2738

23 42,917 200 0,0408 1,7510 0,3329

24 43,073 200 0,0431 1,8565 0,3715

25 43,228 200 0,047 2,0317 0,4418

26 43,381 200 0,0495 2,1474 0,4901

27 43,533 200 0,0535 2,3290 0,5725

28 43,684 200 0,0561 2,4507 0,6294

29 43,834 200 0,0602 2,6388 0,7248

30 43,982 200 0,063 2,7709 0,7938

31 44,065 200 0,0671 2,9568 0,9005

32 44,147 200 0,0701 3,0947 0,9828

33 44,228 200 0,0741 3,2773 1,0982

34 44,308 200 0,0773 3,4250 1,1951

35 44,387 200 0,0813 3,6087 1,3219

36 44,465 200 0,0846 3,7618 1,4314

37 44,543 200 0,0885 3,9420 1,5665

38 44,619 200 0,092 4,1049 1,6928

39 44,694 200 0,0958 4,2817 1,8355

40 44,769 229 0,0995 4,4545 2,2672

41 2085,364 3544 0,101 210,6218 36,1523

42 44,913 146 0,1068 4,7967 1,6653

43 44,984 139 0,1105 4,9708 1,6972

44 45,056 133 0,1142 5,1453 1,7345

45 45,127 127 0,1179 5,3204 1,7654

46 45,197 104 0,1215 5,4915 1,5353

47 22,634 83 0,1252 2,8338 1,3010

293,24572 65,97767

H s i = 4,4446 Xc nh h s i: Ph thuc thng s i v gim loga ca dao ng

i = 0,081 = 0,15 Cng trnh hnh thp, tr thp. Tra thi xc nh h s ng lc i = 2,325

Bng ti trng gi ng gy ra theo phng Y

ioi fW 940

Cao Mj i i y1j n Wpj

(m) KG

1 200 2,325 4,4446 0,00010 1,20 0,260

2 200 2,325 4,4446 0,00030 1,20 0,779

3 200 2,325 4,4446 0,00100 1,20 2,597

4 200 2,325 4,4446 0,00140 1,20 3,636

5 200 2,325 4,4446 0,00250 1,20 6,493

6 200 2,325 4,4446 0,00310 1,20 8,052

7 200 2,325 4,4446 0,00470 1,20 12,208

8 200 2,325 4,4446 0,00550 1,20 14,285

9 200 2,325 4,4446 0,00750 1,20 19,480

10 200 2,325 4,4446 0,00850 1,20 22,078

11 200 2,325 4,4446 0,01090 1,20 28,311

12 200 2,325 4,4446 0,01210 1,20 31,428

13 200 2,325 4,4446 0,01480 1,20 38,441

14 200 2,325 4,4446 0,01610 1,20 41,818

15 200 2,325 4,4446 0,01920 1,20 49,869

16 200 2,325 4,4446 0,02070 1,20 53,765

17 200 2,325 4,4446 0,02400 1,20 62,337

18 200 2,325 4,4446 0,02570 1,20 66,752

19 200 2,325 4,4446 0,02920 1,20 75,843

20 200 2,325 4,4446 0,03120 1,20 81,038

21 200 2,325 4,4446 0,03490 1,20 90,648

22 200 2,325 4,4446 0,03700 1,20 96,102

23 200 2,325 4,4446 0,04080 1,20 105,972

24 200 2,325 4,4446 0,04310 1,20 111,946

25 200 2,325 4,4446 0,04700 1,20 122,076

26 200 2,325 4,4446 0,04950 1,20 128,569

27 200 2,325 4,4446 0,05350 1,20 138,959

28 200 2,325 4,4446 0,05610 1,20 145,712

29 200 2,325 4,4446 0,06020 1,20 156,361

30 200 2,325 4,4446 0,06300 1,20 163,634

31 200 2,325 4,4446 0,06710 1,20 174,283

32 200 2,325 4,4446 0,07010 1,20 182,075

33 200 2,325 4,4446 0,07410 1,20 192,464

34 200 2,325 4,4446 0,07730 1,20 200,776

35 200 2,325 4,4446 0,08130 1,20 211,165

36 200 2,325 4,4446 0,08460 1,20 219,737

37 200 2,325 4,4446 0,08850 1,20 229,866

38 200 2,325 4,4446 0,09200 1,20 238,957

39 200 2,325 4,4446 0,09580 1,20 248,827

40 229 2,325 4,4446 0,09950 1,20 295,911

41 3544 2,325 4,4446 0,10100 1,20 4439,456

42 146 2,325 4,4446 0,10680 1,20 202,501

43 139 2,325 4,4446 0,11050 1,20 199,471

44 133 2,325 4,4446 0,11420 1,20 197,251

45 127 2,325 4,4446 0,11790 1,20 194,455

46 104 2,325 4,4446 0,12150 1,20 164,101

47 83 2,325 4,4446 0,12520 1,20 134,954

Tng ti trng gi tnh v gi ng tc dng ln cu thp theo phng Y:

Tng Tnh (Fx)-

(KG)

ng (Wpj)-(KG)

Tnh + ng (T)

1 76,275 0,248 0,077

2 76,275 0,744 0,077

3 76,275 2,481 0,079

4 78,944 3,473 0,082

5 81,614 6,201 0,088

6 83,292 7,690 0,091

7 84,970 11,658 0,097

8 86,648 13,643 0,100

9 88,326 18,604 0,107

10 90,004 21,085 0,111

11 90,919 27,038 0,118

12 91,835 30,014 0,122

13 92,750 36,712 0,129

14 93,665 39,937 0,134

15 94,581 47,626 0,142

16 95,343 51,347 0,147

17 96,106 59,533 0,156

18 96,869 63,750 0,161

19 97,632 72,432 0,170

20 98,394 77,393 0,176

21 99,005 86,571 0,186

22 99,615 91,780 0,191

23 100,225 101,206 0,201

24 100,835 106,911 0,208

25 101,445 116,585 0,218

26 102,056 122,786 0,225

27 102,666 132,708 0,235

28 103,276 139,158 0,242

29 103,886 149,328 0,253

30 104,496 156,273 0,261

31 104,954 166,444 0,271

32 105,412 173,885 0,279

33 105,869 183,807 0,290

34 106,327 191,745 0,298

35 106,785 201,667 0,308

36 107,242 209,853 0,317

37 107,700 219,527 0,327

38 108,157 228,209 0,336

39 108,615 237,635 0,346

40 109,073 282,601 0,392

41 6015,848 4439,456 10,455

42 109,683 193,392 0,303

43 109,988 190,499 0,300

44 110,293 188,379 0,299

45 110,598 185,709 0,296

46 110,903 156,720 0,268

47 111,208 128,883 0,240

IV/ PHN LC CHN THP V U CC CC

IV.1/ Ni lc di chn ct chu nn v chu ko ln nht nh sau:

1.1 Trng hp 8 : Tnh ti + gi phng Y

- Cp ni lc di chn ct chu nn:

N1 224 T

M1 1,18 Tm

Q1 -8,73 T

N2 223 T

M2 1,32 Tm

Q2 -10 T

- Cp ni lc di chn ct chu ko

N3 -213 T

M3 1,25 Tm

Q3 -0,57 T

N4 -200 T

M4 1,1 Tm

Q4 -0,6 T

IV.1/ Ni lc tc dng ln u cc :

- Phn lc u cc chu ko v nn trng hp 8 nh sau:

- Vy cc chu ko ln nht Pmax = 83,49 (T).

- Kh nng chu ko ca ct thp trong cc l:

)(49,83)(3,971275010004

9,014,312

4

22

TTRd

nP CC

ct thp tha iu kin cc chu

ko

Vy chn s lng ct thp b tr trong cc l 129, thp c cng RC = 12750 (KG/Cm2).

+ Tnh ton cc ngm vo i mng:

- Kh nng chu ko ca 8 thanh thp 18 AIII lin kt u cc vi i mng l: 2 23,14 1,8

8 3650 74,26( )4 4 1000

C C

dP n R T

(1)

- Lc ma st ca cc ngm vo i ng vi ng knh ngoi D600

1 0,8 0,8 3,14 0,6 0,8 90 108,5( ) 83,49( )ms kF D L R T T (2)

Vi cng chu ko ca b tng mc 250(B20) l : Rk = 9(KG/cm2) = 90(T/m2)

Vy chn chiu di phn cc ngm vo i mng l L = 0,8 (m).

Tng cng kh nng chu ko ca u cc do ct thp v ma st l:

(1) + (2) = 74,26 + 108,5 = 182,76 T > 83,49 T tha iu kin lin kt u cc vo i.

Tnh ton lc ma st ca phn b tng thm trong li cc ng knh trong D400 (t 8 18 AIII

lin kt u cc vi i mng) vi b tng cc :

Fms2 = 0,8 * * D * L * Rk = 0,8 * 3,14 * 0,4 * 0,85 * 90 = 76,82 T > 74,26 T

Vy phn li b tng (t 8 18 AIII lin kt u cc vi i mng) phi c chiu di > 0,85 m v

b tr ct thp 818 AIII (c cng chu ko l: Ra = 3650 KG/cm2).

VI. - XC NH SC CHU TI CA CC :

VI.1- SC CHU TI CA CC THEO VT LIU

Trong : B tong mc: 600

Rn = 250 (KG/cm2)

Rc = 12750 (KG/cm2) (Gii hn chy ca thp) Ra = 12750 (KG/cm2)

m = 0,9 (h s k n nh hng un dc cc) D = 60 (cm) - ng knh cc. S thanh thp: n = 12 ng knh thp: = 9 mm Aa = 7,63 (cm2)

Vy: QVL = 723,9 (T)

VI.2 - SC CHU TI CA CC THEO CH TIU C L CA T NN (Tiu chun XDVN 205:1998) Sc chu ti cho php ca cc n xc nh theo cng thc:

Trong : QTC :Sc chu ti tiu chun tnh ton theo t nn ca cc n.

KTC :H s an ton k n nh hng ca nhm cc (Ktc = 1.4 - 1.75), s b ta chn: KTC = 1,4

m = 0,9 (H s lm vic ca cc trong t ) + Xc nh sc chng mi cc Qp:

mR = 1 (H s lm vic ca t mi cc c k n nh hng phng php h cc ) qp (T/m2): Cng chu ti ca t nn mi cc .

Trong :cc h s a,b, Aok,Bok tra bng ph thuc gc ma st trong j, ng knh cc

b = 0,25

a = 0,67

Aok = 48,6

Bok = 87,6

)'

4

2(

aA

aR

pd

nR

VLQ

m

TCK

TCQ

aQ

)4

2(il

sif

fmud

Pq

Rmm

TCQ

4

2dP

qR

mp

Q

)'

(75.0o

kLB

I

o

kA

pd

Ipq ab

L = 35 (m) - Chiu di cc g

' I = 0,876 (T/m3) - Trng lng th tch t di mi cc (Khi no nc c k n s y ni trong

nc) g

I = 0,997(T/m3) - Tr tnh ton trung bnh(theo cc lp) ca trng lng th tch t pha trn mi cc

(Khi no nc c k n s y ni trong nc) dp = 0,6 (m) - ng knh cc qp = 518,4 (T/m2)

Vy sc chng mi cc: Qp= 146,6 (T) + Xc nh thnh phn ma st hng Qf:

Trong : + u: chu vi mt ct ngang cc,(m)

u = * 3,14*0,6 1,89D (m).

mf = 0,9 (H s lm vic ca t mt bn cc c k n nh hng phng php h cc) fsi : ma st bn cc, tra bng, ph thuc su trung bnh ca lp t, trng thi t.(T/m2) li : chiu dy lp t th i m cc i qua.(m)

Cn c vo mt bng b tr cu thp v h s bo co khoan thm d a cht ti v tr h khoan s BH10.

LP T fsi (T/m2) li (m) fsi li (T) 2 0,700 15,3 10,7

3 5,600 9,7 54,3

4 6,800 4,4 29,9

5 6,800 5,6 38,1

7 7,000 2,0 14,0

TNG 37 147,0 Vy thnh phn ma st hng Qf: Qf = 249,5 (T) Do : QTC= 356,5 (T)

Vy sc chu ti ca cc xc nh theo ch tiu c l ca t nn: Qa = 254,6 (T) Kt lun: sc chu ti ca cc chn tnh ton mng: Qc= 255(T)

Tng t tnh ton sc chu ti ca cc ng vi ng knh cc 400 v 500 ta c bng tng hp sau: Bng tng hp sc chu ti ca cc n ng vi ng knh cc 400:

TN H CHIU SU MT

TRN

NG KNH

CHIU DI CC

SC CHU TI MA

ST

CU THP

KHOAN LP T TT (m) CC TNH TON

L (m)

CC N ( T)

CT - A1 HK1 37,4 400 39,4 209

CT - A2 HK3 37,6 400 39,6 209

CT - A3 HK11 39 400 41 221

CT - B1 HK6 37,5 400 39,5 209

CT - B2 HK4 37,4 400 39,4 209

CT - B3 HK9 39,3 400 41,3 221

CT - B4 HK10 35 400 37 192

Bng tng hp sc chu ti ca cc n ng vi ng knh cc 500:

TN H CHIU SU MT

TRN

NG KNH

CHIU DI CC

SC CHU TI MA ST

i l si f f m u

f Q

CU THP

KHOAN LP T TT (m) CC TNH TON

L (m)

CA CC N ( T)

CT - A1 HK1 37,4 500 39,4 280

CT - A2 HK3 37,6 500 39,6 280

CT - A3 HK11 39 500 41 296

CT - B1 HK6 37,5 500 39,5 280

CT - B2 HK4 37,4 500 39,4 280

CT - B3 HK9 39,3 500 41,3 296

CT - B4 HK10 35 500 37 258

VI. Thit k cho i mng cc:

Ni lc di chn ct:

Point Load QX QY N MX MY

1 BAO MAX 5,27 0,67 228,23 1,109 1,246

2 BAO MAX 1,79 0,68 218,39 1,09 1,107

3 BAO MAX 1,99 8,87 224,05 1,118 1,181

4 BAO MAX 2,08 9,69 222,78 1,147 1,319

Ni lc ti trng tm mng 11,13 19,91 893,45 4,464 4,853

- Chiu su chn i tnh t y i n mt i v phi tha mn iu kin: mindh h (hmin l chiu

cao ti thiu ca i tng cc lc ngang tc dng vo i c tip thu ht phn t i din, cc ch lm vic nh cc chu ko hoc nn ng tm)

0

min

2*0,7* 45

2 *

Hh tg

b

Vi: , l gc ma st trong v trng lng t nhin ca ct t y i tr ln 0 315 ; 1,8 /T m

H - tng ti trng ngang. T kt qu ni lc, c Q ti chn ct: 19,91YQ T

b cnh y di theo phng vung gc vi lc ngang Q, chn 5,2b m

0

0

min

15 2*19,910,7* 45 1,1

2 1,8*5,2h tg m

Chn chiu cao i tha iu kin:

min1,6 1,1dh m h m Tha mn yu cu v chc thng ca cc vo i.

S lng cc v b tr cc:

S lng cc c xc nh:

ttN 893,45n 3,5

c Q 255c , Chn nc = 4 cc.

Mt bng b tr cc nh hnh v:

Vy cc ca mng cu thp c chn l 4 cc ng knh 600 mi tha mn yu cu chu nn v chu

ko ca cu thp.

Ta c phn lc tc dng ln u cc l P1 = P2 = Pmin = 98,82 (T) v P3 = P4 = Pmax = 100,07 (T)

VII.Tnh ton ct thp cho i cc :

I

I

II II

Tnh ton moment v b tr thp cho i cc :

o Moment tng ng vi mt ngm I - I :

MI = r1 (P3 + P4 )

Vi P3 =P4 = Pmax = 100,07 (T)

MI = 1,2x (100,07 + 100,07) = 240,17 (Tm).

o Moment tng ng vi mt ngm II - II :

MII = r2 ( P1 + P4 )

Vi P1 = Pmin = 98,82 (T); P4 = Pmax = 100,07 (T)

MII = 1,2 (98,82 + 100,07) = 238,7 (Tm).

Ct thp :

5M 240,17*10IFa1 0,9*R *h 0,9*3650*145a 0

= 50,42 cm2.

Chn : 2716@200; c Fa = 54,26 cm2. B tr theo hai phng.

191,7f *b 2*5200aUF 54,26a

(mm); chn a = 200 (mm).

Kim tra kh nng xuyn thng ca cc vo i cc vi phn lc trn u cc l:

PCmax = 100,07 (T), Chu vi xuyn thng l: Utb = 4x(D+h0) = 4x(0,6+0,55)

0,75* *4( )* 0,75*90*4*(0,6 0,55)*0,55max cx k o o

P P R D h hc

100,07( ) 170,7( )max cx

P T P Tc

. Tha iu kin xuyn thng ca cc vo i.

Kim tra xuyn thng ca ct vo i mng:

Ti trng bnh qun tc dng ln cc893,45

223,36( )4

P Tc .

Lc xuyn thng: Pxt = 4x223.36 =893,45 (T)

Lc chng xuyn: Pcx = 0,75 x RK xUtb xh0 vi Chu vi xuyn thng l: Utb = 4x(ac+ho), vi ac = 1,6(m),

ho = 1,55(m)

Vy 893,45( ) 0,75 90 4 (1,6 1,55) 1,55 1318( )xt cxP T P T . Tha iu kin xuyn thng.

Tnh ton bu long neo chn cu thp s c tnh ton khi c chi tit chn cu thp c th.

thuyet minh tinh mong cau thap dai coc

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