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Question
To study the wind pressure effect on a hollow circular chimney, the projected area calculation is given as:
,d [kks[kyh xksykdkj fpeuh ij ok;qnkc ds izHkko dk vè;;u djus ds fy,] vuqekfur {ks=k x.kuk bl izdkj nh xbZ gS%
A.
(Height of chimney) × (Internal diameter of chimney shaft)
B.
(Height of chimney) × (External diameter of chimney shaft)
C.
(Height of chimney) × (Mean diameter of chimney shaft)
D.
(1/2) × (Height of chimney) × (Internal diameter of chimney shaft)
Answer ( Option B)

(Height of chimney) × (External diameter of chimney shaft)

Solution

Chimney:
• Only two main forces are considered on the chimney, one due to wind pressure and the other due to the self-weight of the chimney.
• Direct stresses are developed due to the self-weight of the chimney and bending stresses are developed due to wind pressure on the chimney.
• For stress calculations or anaysis of forces on a chimney, the wind pressure is assumed to act on the projected area of the chimney.
Projected area:
• The projected area is the area where the wind hits (or strikes) the chimney.
• Therefore this area is equal to the width of the outer face where the wind strikes multiplied by the height of the chimney.
• Projected area = (Height of chimney) × (External diameter of chimney shaft)

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