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Residential shear wall configuration

Residential shear wall configuration

Residential shear wall configuration

I'm working on a residential project. This is in investigation phase because the house is built. How would I analyze these shear wall/frames that are skewed from the rest of the house. I don't want to be too conservative with the wind load because every deficiency will need to be repaired. No seismic concern in the area. On the upper level, there are lots of windows, so no room for shear wall panels. The house was designed using braced wall system from IRC.

Any advice would be appreciated. I would like to know what kind of lateral resisting system one would use and the wind load tributary width.
I've attached a floor plan (with walls circled in red), and an elevation view. Thanks!

RE: Residential shear wall configuration

Three ways:

1. Analyze the two walls for the wind/seismic forces that are parallel to it using the appropriate tributary widths to each wall considering the other shear wall lines.

2. Analyze the two walls on the 45 degree plane using a projected length of 1/1.414 = 71% of the length of the wall and seeing what force it sees.

Use the worse case of 1 or 2.

3. Ignore the walls as shear walls.

Mike McCann, PE, SE (WA)

RE: Residential shear wall configuration

I would start by identifying all of the shear walls and lateral frames on the plans (each level). The plan should also include any collectors, diaphragm discontinuities and openings. Without this, it is really hard to determine the tributaries.

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