Perforated shear wall, not 8ft or 10ft

[tweedledee]

For perforated shear wall design, The IBC gives adjusted shear values in table 2305.3.7.2. The table has two wall heights, 8ft, and 10ft.

What if the walls are not 8ft or 10ft???

Am I missing something?

 

[SacreBleu]

APA TR 157 gives a formula for calculating perforated shear walls. I am not sure if IBC is based on it, but I have been using it for years. The trouble with the IBC is that it has all these "dumbed-down" tables that don't always cover all cases.

 

[tweedledee]

Sacrebleu,
Thanks. It was actually the APA "Diaphragm and shear walls design guide" that first refernced me to the IBC method. The APA gives some examples of the perforated shear wall, but uses the IBC table!

Thanks again

Tweedledee

 

[TFL]

interpolate

 

[SacreBleu]

tweedledee,
Do you have the APA Tech Report 157 formulae?

 

[DaveAtkins]

Ignore the 8' and 10' lines. Just take the height of your tallest opening, and divide that by the height of the wall. Then use the appropriate column (e.g., H/2 or H/3), or interpolate between columns.

DaveAtkins

 

[boo1]

Agree with DaveAtkins

 

[tweedledee]

sacrebleu: I have the report #157 now, thanks.

Daveatkins: I didn't really know what the h/2 etc repws were for,. thanks.

tweedledee

 

[skier1578]

The process we have been asked to use in our local jurisdictions in Southern California is to determine the forces and shears in each free body panel around the opening and size according to the greatest values. There is a good example of this in the SEAOC Seismic Design Manual, Vol. II, design example 1, part 9.