ASCE 7-05 Wind Loads Question

• Apr 17, 2012

• #2

MiketheEngineer

Structural

Sep 7, 2005

4,654

US

I would probably use a "sign post" analysis - just assume that the gable is a big sign??

 

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• Apr 17, 2012

• Thread starter
• #3

Decartes

Structural

Oct 23, 2001

8

US

@MiketheEngineer, how would you then account for the uplift/downward pressures on the roof? Do you think ASCE 7-05, 6.5.13 or 6.5.15 would apply?

 

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• Apr 17, 2012

• #4

JAE

Structural

Jun 27, 2000

15,716

US

I think the shape of the roof is more important than the number of columns.

 

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• Apr 18, 2012

• #5

RobertHale

Structural

Jan 4, 2007

163

US

I would agree with JAE. The Cn values account for the aerodynamic shape of the roof. The negative values of Cn will generate your uplift. I would think it is important to keep the cases distinct to capture the overturning moment at the top of the column, as well as applying Figure 6-9 to generate torsional moments on the column.

 

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• Apr 18, 2012

• Thread starter
• #6

Decartes

Structural

Oct 23, 2001

8

US

@ JAE and RobertHale, I agree with both of you, ASCE 7-05 Sect. 6.13 applies, because the roof of the open structure is a critical design feature. Thanks to all who replied so far, I really appreciate it.

 

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