Garage Portal

[Supun93]

Recently i did a garage design, where i gave a strong wall for the garage wall because of garage opening. Later client came back to me telling that is is over engineered and asking me to change it.
The client had his Engineer modify from strong walls to replacing them with Hdu hold downs shown in attached picture. MSTC28 (x2) making the king stud and top plate connections. at the bottom strong walls were replaced at the bottom with Hdu. The inspector allowed this change with their RFI from their Engineer. Is this something we can do, how are we going to provide a calculation for this. Aspect Ratio is not in the acceptable limit as per the codes.

 

[ctopher]

Why do double work? Have the client's engineer supply the calculation.

 

[ChorasDen]

APA has a white paper on design capacity of garage portal frames, including required minimum aspect ratio of wall segments and connections, based upon testing. I don't know the document number offhand, but I would expect it easy to find on their website. One thing to note is that it is a tested assembly, and as such, limited to maximum wall heights and minimum header sizes. The assembly connection between the wall segment and header needs to meet their criteria, I don't see that shown appropriately in the detail you included above.

 

[Supun93]

Yes exactly. I gave them a strong wall as the design. But they refused and told me it is an over design. They propose this method. I looked through APA portal frames. Does not quite match with it.