Wind Load:

Force due to transverse wind on gallery 125 kg/sq.m 0.125 t/sq.m

1226.25 N/m2

1.22625 kN/m2

Width= 3 m

Calculate obstructed area for exposure of 16 m length x 2.5 M height gallery

all the section taken below are assumed on higher side. Staad file may be referred for more details.

section width (m) length No. Area (sqm)

top rafter a ISA100X100X10 0.1 16 0 0.0

mid rafter b ISMC250 0.25 16 0 0.0

bottom rafter c ISA110X110X12 0.11 16 0 0

vertical strut d ISMC250 0.08 5.55 0 0

MC150 0.075 2.4 8 1.4

truss bracing e ISA110X110X8 0.11 3.5 0 0

ISA100x100x6 0.1 3.2 8 2.6

ISA100x100x6 0.1 16 2 3.2

PIPE 350NB 0.35 16 2 11.2

PIPE 300NB 0.3 16 0 0

PIPE150NB 0.15 16 1 2.4

PIPE250NB 0.25 16 0 0

CABLE TRAY 0.3 16 0 0

total = 20.80

obstracted area at 12.75 M level

Aa+[0.25*Ad+Ae]+0.6Af = 0 m2

obstracted area at 7 M level

Ac+0.5{Ad+Ae}+350NB pipe area+0.5*(A350+A300) 11.2 m2

obstracted area at 9.2 M level = 20.8- 0 - 11.2 = 9.60 m2

for 1 m length area = 1.3 m2

Type of member

solidity ratio = area of obstruction under canopy/ gross area= 0.520

For = 0.52 Cf = 1.6 table 28 IS875 part 3

wind load = Cf Ae p = 260 Kg

frame space ratio = 1.200 2

eff solidity ratio β (for given )= 0.52

round

flat

1

for flat sided member shielding factor n (table 29 IS875 part 3)= 0.45

wind load = 117.00 kg

total wind load = 377.00 / m distributed at various level in proportion of area

level obstructed area (m2) load Kg /m)

at EL. 7 M 11.2000 203

at EL. 9.5 M 9.6000 174

at EL.11.95 M 0.0000 0

20.8 total wind load 377

wind load on column :

sizes of columns are assumed

trestle column ISMB300(web facing) b( mm) = 300

tower colum2ISMC 200 b( mm) = 200

table 26 IS875 part 3 Cf = 2.05

wind per meter on tower column = Cf Ae p = 51.25 Kg/m wind ward

wind per meter on trestle column = Cf Ae p = 76.875 Kg/m wind ward

force due to longitudinal wind on gallery

Calculate obstructed area for exposure 3.65 x 5.55 M height gallery

section width (m) length Area No. total Area

(sqm) (sqm)

Top beam/rafter ISMB400 0.4 2.5 1 2 2

columns ISMB300 0.3 0 0 0 0

canti beam ISMC100 0.1 0.8 0.08 4 0.32

cross beams ISMB200 0.2 2.6 0.52 3 1.56

ISMB400 0.4 2.5 1 0 0

ISMB500 0.5 5.75 2.875 0 0

ISMB350 0.35 5 1.75 0 0

t=10mm 0.13854 0 0.00000

t=10mm 0.10752 2 0.21504

t=10mm 0.08042 1 0.08042

t=10mm 0.05726 1 0.05726

t=10mm 0.03801 2 0.07603

t=8mm 0.02138 2 0.04276

t=6mm 0.00985 3 0.02956

t=6mm 0.00665 1 0.00665

PIPE 400 NB

PIPE 350 NB

PIPE 300 NB

PIPE 250 NB

PIPE 200 NB

PIPE 150 NB

PIPE 100 NB

PIPE 80 NB

2

t=5mm 0.00283 1 0.00283

t=5mm 0.00096 2 0.00192

CABLE TRAY 0.075 1.8 2 0.27

total = 4.66

obstracted area at 12.75 M level

kp1(top rafter area)+kp2 ( column area)+kp3 (cable tray area )= 1.1498 m2

kp1= 33% kp2= 25% kp3= 50%

obstracted area at 7 M level

bottom rafer area+25% column area+350 NB,80NB,50NB pipe area+50% other pipes area+50%cantileve

0.512+ 0.500+ 0.117+ 0.109+ 0.1600= 1.398 m2

obstracted area at 9.5 M level

4.662 - 1.150 - 1.398= 2.11 m2

=solidity ratio = area of obstruction under canopy/ gross area

= [ Ab/Ag where Ab=LxB L=2.5m B=3.4m ] 0.549

Spacing of trstles/gallery gallery memb= 2 m c/c

for O = 0.549 Cf = 1.6 table 28 IS875 part 3

frame space ratio = 0.58823529

eff solidity ratio b = O = 0.365 0.43823 for flat sided member

shielding factor n = 0.55 table 29 IS875 part 3

for trestles @ 6 m c/c

No of panel in pipe rack = 70/6 - 1 =11 length = 70 m

Area of vertical struts of gallery @ 2 m c/c = 1.25 m2

obstructed area at every 2m = 3.13 m2

obstructed area at every trestle point =column+beam area = 3.88 m2

total no of panel = 60 length = 120 m

No. of trestles/members= 9

No of panel in gallery = 51

Intensity of Cf Ae p = 523.8 N/mm2

wind load = 22.18789 t

wind load = 22.18789 t

level obstructed area (m2) load on each leg

PIPE 50 NB

PIPE 25 NB

3

at EL.11.95M 1.1498 5.4717 4.5x2

at EL.9.45 M 2.11 10.0623 8x2

at EL.7 M 1.398 6.6539 5.2x2

total area 4.66 m2 total wind 22.1879 tonne

wind load on column :

sizes of columns are assumed

trestle column ISMB300(flange facing) b( mm) = 300 Cf = 0.9

tower column 2ISMC 200 b( mm) = 160 Cf = 2

table 26 IS875 part 3

wind per meter on tower column = Cf Ae p = 40 Kg/m wind ward

wind per meter on trestle column = Cf Ae p = 33.75 Kg/m wind ward

4

5.600

5

*

*

3.88

6

0.78

m2

er beam

7

8