The design wind speed is assumed to be constant from the mean ground level upto a height of

Explanation:

• According to IS 875 (Part 3): 2015, the design wind speed is assumed constant from mean ground level up to a height of 10 meters.

• This means, for structures up to 10 m height, the wind speed is considered uniform for design purposes.

• Above 10 meters, wind speed is considered to increase with height according to the terrain roughness and height factor.

• This assumption simplifies wind load calculations on low-rise buildings and structures.

Additional Information

• Design wind speed is a fundamental parameter used to calculate wind loads on structures, ensuring safety against wind forces.

• It varies with location, terrain roughness, and height above ground level.

• Near the ground, wind speed is lower due to surface roughness (trees, buildings, terrain).

• Wind speed generally increases with height because of reduced friction and obstacles.

• In IS 875 (Part 3): 2015 (Indian Standard for wind loads), wind speed is assumed constant up to 20 meters from mean ground level to simplify calculations for low-rise structures.

• Beyond 10 meters, wind speed increases and is calculated using a height factor that accounts for terrain category and exposure.

• Accurate wind speed data help in designing structures that can withstand dynamic wind pressures, minimizing risks of failure or excessive vibration.