## ASCE wind calculation for Arched curved roof for cladding with height >60'

## ASCE wind calculation for Arched curved roof for cladding with height >60'

(OP)

I am referring ASCE 7-05

-What is the definition of mean height for an arched roof semi circle? will it the total height (i.e radius of circle) or half radius?

- is there a sample of calculation as per asce for wind for cladding of this type of building

-Figure 6-8 page 51 is not clear on defining roof perimeter area for cladding in order to use external pressure coef as per fig 6-11

-What is the definition of mean height for an arched roof semi circle? will it the total height (i.e radius of circle) or half radius?

- is there a sample of calculation as per asce for wind for cladding of this type of building

-Figure 6-8 page 51 is not clear on defining roof perimeter area for cladding in order to use external pressure coef as per fig 6-11

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

Look at Note 2 on page 50 and/or Note 1 on Figure 6-16, page 64. Does that answer your question?

- is there a sample of calculation as per asce for wind for cladding of this type of building

Don't know of any myself.

-Figure 6-8 page 51 is not clear on defining roof perimeter area for cladding in order to use external pressure coef as per fig 6-11

I'm not sure I understand your question. Figure 6-8 is for Main Wind Force Resisting System loads and has nothing to do with C&C wind.

Check out Eng-Tips Forum's Policies here:

FAQ731-376: Eng-Tips.com Forum Policies

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

In page 51 , it is stated for arch roof and they have put note 4 for component and cladding where they are referring to go for fig 6-11.

It is confusing that is why I was asking about an example of application.

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

Note 4 would require you to do the following:

1. Compute the spring line angle of your arch. If it is truly a half-circle arch then the spring line angle is 90 degrees.

2. Compute the value of "a" which is the distance from the perimeter inward where the note 4(1) changes to note 4(2). The distance of "a" is shown in the notes of Figure 6-11.

3. Since ASCE 7 is silent on what to do with roof pressures when the slope is > 45 degrees (per the limit in Table 6-11D, one approach would be then to assume your eave, or perimeter edge of roof is the point where the slope of your arch is exactly at 45 degrees slope and tread everything below it as a wall. In doing that you can then take the arch as a smaller arch length and calculate everything accordingly. I'm not sure how valid this is - the commentary doesn't seem to even discuss this so I don't know of a better approach.

4. So you would have wall wind loads below that 45 degree mark and "roof" wind loads, using Figure 6-11D for the perimeter edge roof loads (using the "a" dimension above.

Check out Eng-Tips Forum's Policies here:

FAQ731-376: Eng-Tips.com Forum Policies

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

The windward and leeward "wall" pressures are shown as horizontal forces.

I might be inclined to treat them as perpendicular forces to the surfaces of the wall and the arch.

This is more in line with C&C wind pressures.

Check out Eng-Tips Forum's Policies here:

FAQ731-376: Eng-Tips.com Forum Policies

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

and he is using h as the total height till the top of circle.

That's why I needed a clear example in a book in order to convince this consultant.

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

At your half-circle, the arch is exactly vertical...thus the angle is 90 degrees from the horizontal per definition of ASCE 7.

Using h as the total height of the circle is also incorrect as ASCE 7 is quite clear that the value of h is the sum of the height at the eave plus the average height of the arch.

I don't have a book reference or example.

Check out Eng-Tips Forum's Policies here:

FAQ731-376: Eng-Tips.com Forum Policies

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

https://www.windloadcalc.com/product/asce-7-10-com...

Check out Eng-Tips Forum's Policies here:

FAQ731-376: Eng-Tips.com Forum Policies

## RE: ASCE wind calculation for Arched curved roof for cladding with height >60'

DO ASCE answer technical questions similar AISC