bnbc wind pressure

8/13/2019 BNBC Wind Pressure

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B y

L x

L

Inpu t zone

Please don ot try to input any value outs ide this box , i t may cause col laspe of the syst

Unit selection 2

No of bays in X- dir 5 (B) No of Storey 25

Spacing in X-dir 20 ft Typical storey height 3No of bays in Y- dir 4 (L) Bottom storey height 3Spacing inY-dir 15 ft

Exposure A

Stru. Imp. Categoy 1

Basic Wind Speed 210 mph

For help Explore HELP-1and HELP-2

B 100 L 60 60

Output

L/B 0.6 H/B 0.75 H/Bmin 1.25

Storey Elevation Cz Gz p zz(ft) psf

1 3.00 0.368 1.34998 84.8372 6.00 0.368 1.34998 84.8373 9.00 0.368 1.34998 84.8374 12.00 0.368 1.34998 84.837 Prepared b y5 15.00 0.370256 1.34998 85.3586 18.00 0.398908 1.34998 91.963 Md. Nazmul Hassan7 21.00 0.425956 1.34998 98.198 Student no.# 00040768 24.00 0.450949 1.34998 103.960 Level-4, Term-1

9 27.00 0.475943 1.34998 109.722 Department of Civil Engineeri

10 30.00 0.500264 1.34998 115.329 BUET11 33.00 0.520991 1.34998 120.10712 36.00 0.541717 1.34998 124.88513 39.00 0.562444 1.34998 129.66414 42.00 0.580765 1.34998 133.88715 45.00 0.598749 1.34998 138.03316 48.00 0.616732 1.34998 142.17917 51.00 0.633625 1.34998 146.07418 54.00 0.64978 1.34998 149.798


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19 57.00 0.665934 1.34998 153.52220 60.00 0.681609 1.34998 157.13521 63.00 0.696239 1.34998 160.508

22 66.00 0.710869 1.34998 163.88123 69.00 0.725458 1.34998 167.24424 72.00 0.738869 1.34998 170.336

25 75.00 0.752281 1.34998 173.428

Height Pressure

0 0 84.8371 4.5 84.8371 4.5 84.8372 7.5 84.8372 7.5 84.8373 10.5 84.8373 10.5 84.8374 13.5 84.837

4 13.5 85.3585 16.5 85.3585 16.5 91.9636 19.5 91.9636 19.5 98.1987 22.5 98.1987 22.5 103.9608 25.5 103.9608 25.5 109.722


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9 28.5 109.7229 28.5 115.329

10 31.5 115.329

10 31.5 120.10711 34.5 120.10711 34.5 124.885

12 37.5 124.88512 37.5 129.66413 40.5 129.66413 40.5 133.88714 43.5 133.88714 43.5 138.03315 46.5 138.03315 46.5 142.179

16 49.5 142.17916 49.5 146.07417 52.5 146.07417 52.5 149.798

18 55.5 149.79818 55.5 153.52219 58.5 153.52219 58.5 157.13520 61.5 157.13520 61.5 160.508

21 64.5 160.50821 64.5 163.88122 67.5 163.88122 67.5 167.24423 70.5 167.24423 70.5 170.33624 73.5 170.336

24 73.5 173.42825 75 173.42825 75 173.42826 75 173.428

26 75 173.42827 75 173.42827 75 173.42828 75 173.42828 75 173.42829 75 173.42829 75 173.42830 75 173.428

30 75 173.42831 75 173.42831 75 173.42832 75 173.42832 75 173.42833 75 173.42833 75 173.42834 75 173.42834 75 173.428


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35 75 173.42835 75 173.42836 75 173.428

36 75 173.42837 75 173.42837 75 173.428

38 75 173.42838 75 173.42839 75 173.42839 75 173.42840 75 173.42840 75 173.42841 75 173.42841 75 173.428

42 75 173.42842 75 173.42843 75 173.42843 75 173.428

44 75 173.42844 75 173.42845 75 173.42845 75 173.42846 75 173.42846 75 173.428

47 75 173.42847 75 173.42848 75 173.42848 75 173.42849 75 173.42849 75 173.42850 75 173.428


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H z

x

m

ftft

g


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0

100

0.000 20.000 40.000 60.000 80.000 100.000 120.000 140.000 160.000 180.000 200.000

Height,

ft

Pressure, psf

Graphical representation of design wind pressure for multistoried building (BNBC-1993)


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Combined Height and Exposure Coefficient, Cz

Ht. above GL Exposure

z,m A B C

0-4.5 - 0.368 0.801 1.1962 6 - 0.415 0.866 1.2633 9 - 0.497 0.972 1.374 12 - 0.565 1.055 1.451

1 5 15 - 0.624 1.125 1.517(0-30) 6 18 - 0.677 1.185 1.573

7 21 - 0.725 1.238 1.623

8 24 - 0.769 1.286 1.6679 27 - 0.81 1.33 1.706

10 30 - 0.849 1.371 1.7432 7 35 - 0.909 1.433 1.797

2 8 40 - 0.965 1.488 1.8462 9 45 - 1.017 1.539 1.89(35-50) 10 50 - 1.065 1.586 1.93

6 60 - 1.155 1.671 2.0027 70 - 1.237 1.746 2.065

3 8 80 - 1.313 1.814 2.12

(60-200) 9 90 - 1.383 1.876 2.17110 100 - 1.45 1.934 2.21711 110 - 1.513 1.987 2.2612 120 - 1.572 2.037 2.29913 130 - 1.629 2.084 2.33714 140 - 1.684 2.129 2.37115 150 - 1.736 2.171 2.404

16 160 - 1.787 2.212 2.43617 170 - 1.835 2.25 2.46518 180 - 1.883 2.287 2.49419 190 - 1.928 2.323 2.521

20 200 - 1.973 2.357 2.54711 220 - 2.058 2.422 2.59612 240 - 2.139 2.483 2.641

4 13 260 - 2.217 2.541 2.684(220-) 14 280 - 2.91 2.595 2.724

15 300 - 2.362 2.647 2.762

Gust Response Factors,Gz

z( m) A B C

0-4.5 1.654 1.321 1.1542 6 1.592 2 1.294 2 1.143 9 1.511 3 1.258 3 1.1214 12 1.457 4 1.233 4 1.107


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1 5 15 1.418 5 1.215 5 1.097(0-30) 6 18 1.388 6 1.201 6 1.089

7 21 1.363 7 1.189 7 1.082

8 24 1.342 8 1.178 8 1.0779 27 1.324 9 1.17 9 1.072

10 30 1.309 10 1.162 10 1.067

2 7 35 1.287 7 1.151 7 1.0612 8 40 1.268 8 1.141 8 1.0552 9 45 1.252 9 1.133 9 1.051

(35-50) 10 50 1.238 10 1.126 10 1.0466 60 1.215 6 1.114 6 1.0397 70 1.196 7 1.103 7 1.033

3 8 80 1.18 8 1.095 8 1.028(60-200) 9 90 1.166 9 1.087 9 1.024

10 100 1.154 10 1.081 10 1.0211 110 1.114 11 1.075 11 1.01612 120 1.134 12 1.07 12 1.01313 130 1.126 13 1.065 13 1.01

14 140 1.118 14 1.061 14 1.00815 150 1.111 15 1.057 15 1.00516 160 1.104 16 1.053 16 1.00317 170 1.098 17 1.049 17 1.00118 180 1.092 18 1.046 18 119 190 1.087 19 1.043 19 1

20 200 1.082 20 1.04 20 111 220 1.073 11 1.035 11 112 240 1.065 12 1.03 12 1

4 13 260 1.058 13 1.026 13 1(220-) 14 280 1.051 14 1.022 14 1

15 300 1.045 15 1.018 15 1

Overall Pressre coefficient,Cp for Rectangular Building with Flat Fo

H/B L/B

1 2 3 4 5 6

0.1 0.5 0.65

1


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oting

7 8 9 10 11

1 2 3

1.4 1.15 1.1

1.7 1.3 1.15

2 1.4 1.2

2.2 1.6 1.25


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z(m) Cz

1 0.914401829 0.368 0 02 1.828803658 0.368 0 03 2.743205486 0.368 0 04 3.657607315 0.368 0 05 4.572009144 0.370256 1 16 5.486410973 0.398908 1 17 6.400812802 0.425956 1 28 7.31521463 0.450949 1 2

9 8.229616459 0.475943 1 210 9.144018288 0.500264 1 311 10.05842012 0.520991 1 312 10.97282195 0.541717 1 3

13 11.88722377 0.562444 1 314 12.8016256 0.580765 1 415 13.71602743 0.598749 1 416 14.63042926 0.616732 1 417 15.54483109 0.633625 1 518 16.45923292 0.64978 1 5

19 17.37363475 0.665934 1 520 18.28803658 0.681609 1 621 19.2024384 0.696239 1 622 20.11684023 0.710869 1 623 21.03124206 0.725458 1 724 21.94564389 0.738869 1 725 22.86004572 0.752281 1 7

Note 2:Type 1 to use MKS and type 2 for FPS

Note 3:Type "A" , "B" ,"C" to input Expouser Category.

Exposure A:Urban and sub-u rban a reas , indus tr ia l a reas , wooded a reas , h il ly o r o ther te

cover ing a t leas t 20% of the area w ith obs truc ti ons of 6 meters o r mo re i n hei ght and e ten

the site at least 500 meters o r 10 times the height of th e structu re, whichever is greater.Exposure B:Open terra in wi th scattered obstruct ions having heights general ly less the\a

extending 800m or mo re from the si te in any fu ll quadrant. This category inc ludes air f ield

park lands, sparsely bu i l t -up ou tk i r ts of tow ns, f lat open cou ntry and grasslands.Exposure C:Flat and uncovered open ter rain , cos tal areas and r ive rs ides fac ing large bo

water , over 1.5km or m ore in width. Exposure C extends in land from the shore l ine 400m o

the height of struc ture, whichever is greater.

Note 4:Structural Importance Coefficients, Ci

i) Essen tial facil i t ies 1.25

i i) Hazardou s facil i t ies 1.25 i i i ) Special occ upancy Structu res 1.00

iv) Low risk struc tures 0.8

Note 1:

$ BANGLADESH NATIONAL BUILDING CODE,1993 is used as a guideline.$ Projected area method is used to calculate Wind pressure.


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Gust Response Factors, Gh

Storey Z(m) Gz

1 0.914401829 1.654 0 02 1.828803658 1.654 0 03 2.743205486 1.654 0 0

4 3.657607315 1.654 0 05 4.572009144 1.651024 1 16 5.486410973 1.613228 1 17 6.400812802 1.581178 1 2

8 7.31521463 1.556489 1 29 8.229616459 1.5318 1 210 9.144018288 1.508408 1 311 10.05842012 1.491948 1 312 10.97282195 1.475489 1 313 11.88722377 1.45903 1 3

14 12.8016256 1.446579 1 415 13.71602743 1.434692 1 416 14.63042926 1.422804 1 417 15.54483109 1.412552 1 518 16.45923292 1.403408 1 519 17.37363475 1.394264 1 520 18.28803658 1.3856 1 6

21 19.2024384 1.37798 1 622 20.11684023 1.37036 1 623 21.03124206 1.362781 1 724 21.94564389 1.35638 1 7

25 22.86004572 1.34998 1 7


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h12.5 22.86004572 1.34998 1 7

Overall Pressure coefficientH L(y) B(y)

22.86005 18.28803658 30.48006

load on B face

UL UL

1.7

H/B 0.75 1 1

L/B 0.6 4 4

H/B L/B0.1 ---- 0.5 ------ 0.65 -----

1 4 1.4 1.45 1.55

Cp CAL 1.516667 0

Cp 1.516667

Wind Speed

114218.4757 Km/h

AreaB1 B2

Top Floor 13.93551 100 60Typical Floor 27.87102Ground floor 27.87102


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A1 2 3 3 3 4

0.368 0 0 0 0 0 0 00.368 0 0 0 0 0 0 00.368 0 0 0 0 0 0 00.368 0 0 0 0 0 0 0

0 0.370256 0 0 0 0 0 00 0.398908 0 0 0 0 0 00 0.425956 0 0 0 0 0 00 0.450949 0 0 0 0 0 0

0 0.475943 0 0 0 0 0 00 0.500264 0 0 0 0 0 00 0.520991 0 0 0 0 0 00 0.541717 0 0 0 0 0 0

0 0.562444 0 0 0 0 0 00 0.580765 0 0 0 0 0 00 0.598749 0 0 0 0 0 00 0.616732 0 0 0 0 0 00 0.633625 0 0 0 0 0 00 0.64978 0 0 0 0 0 0

0 0.665934 0 0 0 0 0 00 0.681609 0 0 0 0 0 00 0.696239 0 0 0 0 0 00 0.710869 0 0 0 0 0 00 0.725458 0 0 0 0 0 00 0.738869 0 0 0 0 0 00 0.752281 0 0 0 0 0 0

0 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 0

0 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 0

0 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 0

rain

d ing f rom

n 10m

s, open

dies of

r 10 time


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0 0 0 0 0 0 00 0 0 0 0 0 00 0 0 0 0 0 0

0 0 0 0 0 0 0

A0 1 1 2 3 3 3 4

1.654 0 0 0 0 0 0 01.654 0 0 0 0 0 0 01.654 0 0 0 0 0 0 0

1.654 0 0 0 0 0 0 00 1.651024 0 0 0 0 0 00 1.613228 0 0 0 0 0 00 1.581178 0 0 0 0 0 0

0 1.556489 0 0 0 0 0 00 1.5318 0 0 0 0 0 00 1.508408 0 0 0 0 0 00 1.491948 0 0 0 0 0 00 1.475489 0 0 0 0 0 00 1.45903 0 0 0 0 0 0

0 1.446579 0 0 0 0 0 00 1.434692 0 0 0 0 0 00 1.422804 0 0 0 0 0 00 1.412552 0 0 0 0 0 00 1.403408 0 0 0 0 0 00 1.394264 0 0 0 0 0 00 1.3856 0 0 0 0 0 0

0 1.37798 0 0 0 0 0 00 1.37036 0 0 0 0 0 00 1.362781 0 0 0 0 0 00 1.35638 0 0 0 0 0 0

0 1.34998 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 00 1.34998 0 0 0 0 0 0

1 ------ 2 31.4 1.15 1.1


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B1 2 3 3 3 4

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

B0 1 1 2 3 3 3 4

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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C0 1 1 2 3 3 3 4

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0

C0 1 1 2 3 3 3 4

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0

0 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 00 0 0 0 0 0 0 0


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Note 5:If Building is non Slender* this chart can be used directly. For Slender building manufor Gust response factor .* Slender buildings and structures: Building and structures having a height exceedinleast dimension, or a fundamental natural frequency less than 1.0 Hz. For those casehorizontal dimentions vary with height, the least horizontal dimention at midhight sh


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al input is required

g five times thes in which theall be used.

bnbc wind pressure

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