# Wind Loads using ASCE 7-05

How do you calculate wind loads using ASCE 7-05 for the following structure?

A monoslope roof over an open structure. Height = 10', width = 5', length = 100'

Lets say wind speed = 90 MPH, Exposure "B".

The problem comes with the h / L value. In this case it is 2.0 which falls outside of the range of the table in the code.

Question: How do I use the code for this structure?

 Newton1Law Posts: 60, Reputation: 20 Junior Member #2 Jul 20, 2010, 12:54 PM
Often the angle is used to calculate the effective area exposed to the wind. If H/L is 2, then your saying the Height=10' and the lenght = 5'. The exposed horizontial equalivent perpendicular surface would have a 1000 sq.ft. At 29.92 In-Hg and temperature of 77 degrees F, the wind would produce a 21.845 Lb/Ft squared pressure or about 11 tons of pressure. Seems high though.

Hope this helps,

Newton1Law
 bscusa Posts: 2, Reputation: 1 New Member #3 Aug 27, 2013, 08:00 AM
The building will be considered open so the GCpi will be affected. The rest is math. 11 tons of pressure from Newton1Law is not close.

I need to know the slope of the roof to complete the calcs. The pressure on the roof can be handled, it's the horizontal component of the shear that is going to hurt you.

## Check out some similar questions!

Does anyone out there know how to calculate the wind load on a wooden fence? I have used 12 foot 4 x 4 pressure treated posts set in 4 feet of concrete spaced 8 feet apart. The concrete was poured in a 12 inch in diameter concrete tube. I used a strong concrete mix in the ratio 3:2:2. I want to use...