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14-05-2011
8 m polygonal camera pole 1. Ref code
:
Loadings Steel Design
wind load as per ASCE7-05 BS 5950
2. Design datas ; datas ; Wind speed = 160 kmph = 44.4 m/s , exposure D 3. Analysis and Design Anchor bolts are designed designed for the wind load moment and shear forces at the base base plate level. Wind load calculation : ( As per ASCE7-05, for exposure D) basic wind speed V = 44.4 m/s factors Kz = 1.16
( max considered)
upto 9.1 m (30') ht & exposure D
wind load kN/m .. Table 6-3 0. 0.37
impo import rtan ance ce fact factor or , cate catego gory ry I
.. Table 6-1
Kzt = 1 I
= 0.87 0.87
2.
dynamic pressure q = 0.613 K z.Kzt. V
I
8m
N/m² 2
= 0.613 x 1.16 x 1.0 x 44.4 x 0.87 = 1219 N/m² = 1.22 kN/m² wind load factor C f = 1.2 0.82 wind load = Cf.q. projected area section of pole varies from approximately 555 mm to 250 mm at top. hence wind load varies from; 1.2x1.22x0.25 = 0.37 kN/m at top 1.2x1.22x0.555 = 0.82 kN/m at bottom
moment at base ,M = WL²/2 W L²/2 = (0.82+0.37)/2 x 8.0² /2 = 20 kNm shear at base , H = WL = (0.82+0.37)/2 x 8.0 = 5 kN