I have a copy of Ketchum's Structural Engineers Handbook (1924), which has some information about wind loads.
Steel Mill Buildings
Wind Pressure:
p = 0.004V2
where:
p: wind pressure on a flat surface normal to the wind direction, in pounds per square foot
V: wind velocity, in miles per hour
For rectangular buildings, Ketchum suggests using 80% of the above value and concludes that 30psf '...would be sufficient...' for all except exposed locations and that 20psf '...is certainly ample...' if the building is somewhat protected and the height is less than 30ft.
Steel Office Buildings
The following values are extract from a Carnegie Steel Company table, based on the building laws of various cities:
[ul][li]New York (1917): 30psf[/li]
[li]Chicago (1919): 20psf[/li]
[li]Philadelphia (1919): 30psf. Wind pressure for high buildings in built-up districts: 25 pounds at tenth story, 2.5 pounds less for each storey below and 2.5 pounds for each storey above, up to 35 pounds.[/li]
[li]St Louis (1917): 30psf[/li]
[li]Boston (1919): 10-20psf. For buildings 40ft high, 10psf; up to 80ft, 15psf; over 80ft, 20psf.[/li]
[li]Cleveland (1920): 20psf. Wind pressure on curtain walls, 30psf[/li]
[li]Baltimore (1908): 30psf[/li]
[li]Pittsburgh (1914): 25psf[/li]
[li]Cincinnati (1917): 20psf[/li]
[/ul]