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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)
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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
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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
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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:
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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
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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
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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
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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
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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
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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
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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
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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
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Page 13
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
-
Page 14
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
-
Page 15
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
-
Page 16
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
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Page 17
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
-
Page 18
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:
-
Page 19
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.
-
Page 20
- 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
-
Page 21
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
-
Page 22
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:
-
Page 23
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 :
-
Page 24
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
-
Page 25
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.