ASCE 7-05 - Wind Method 1

[steellion]

I am trying to determine if it is acceptable to use Method 1 to determine wind pressures on this project. I have a one-story structure, cold-formed steel trusses on masonry bearing walls. This building passes each condition in 6.4.1.1 and 6.4.1.2, but I question if the roof shape is acceptable for Method 1. The trusses support a gable that spans across the short direction of a rectangular building, but then on half of the building there is another gable roof that is perpendicular and runs into the primary roof. This roof will be stick-built; therefore, I believe Method 1 is acceptable since the load is getting back to the gable trusses anyway. I would appreciate your input.

(99% of the time I skip over Method 1 and go straight to Method 2 because of all of the conditions. I understand that ASCE 7-10 has broadened the scope of the simplified approach, but wind also now extends to 6 chapters. We can't win!)

 

[frv]

There is a lot of leeway in the statement "approximately symmetrical cross section". I wouldn't worry about it and just use Method 1. It's conservative in most cases anyway.

ASCE 7-10 is indeed separated into several chapters now. But frankly, it's a lot easier to follow. There is a much more logical flow to it.

 

[hello12345hello]

Can you please provide some roof framing plan and and size of the building and sketch for showing some section with elevation that will be really helpful to understand. And do u have to use ASCE 7-05 or 7-10.?