Stud wall design under window

[braves25]

Hello all,
See attached picture of what I am referring to here. How do y'all go about designing the portion of wall under the window? In the picture, the two windows at each side of the main entry, I would typically design the sill to transfer the wind load to each jamb. However, where the door occurs, this cannot be accomplished. I know Simpson has a kneewall connector, but I have problems making this work due to deflection (especially where I have a brick veneer). I've used a HSS member and run this down to the footing and then use the same sill design approach as noted above, but this seems a bit much. Any ideas or solutions to this common issue?
Thank you and have a great day.

 

[BridgeSmith]

The knee walls will either be cantilevered from the columns, cantilevered from the slab/footing below, or a combination of the two.

Rod Smith, P.E., The artist formerly known as HotRod10

 

[XR250]

When I'm the EOR, I show a tube steel post. When I am the delegated LGS designer, I push for a tube steel post, get laughed at, and then do the cantilevered studs. I am never happy with that solution. They usually need to be spaced about 6" O.C. to get the deflections to work out. I've witnessed many of these built without any consideration for this issue. Ultimately, the jamb of the storefront it likely doing all the work.

 

[jayrod12]

When I'm EOR I provide either a tube post, or a series of cantilevered angles, maybe at 4 ft or so o/c and they can infill frame between them.

 

[KootK]

I generally do the HSS post because, as XR alluded, it just avoids a lot of painful coordination and gets me to "done" faster and with less friction. That said, there is one thing that I really don't like about that solution: it creates a differential deflection issue between the door jamb and the post in an envelope sensitive application.

My money says that, one way or another, the primary structural behavior in these situations is for the window sill and CFM sill plate to span horizontally to the door jamb member. For this reason, I'll play fast and loose with the cantilever stud deflection when I do that if I'm not in a hurricane zone etc. Unfortunately, because of sequencing and build up issues, I haven't yet dreamed up a way to specify a robust connection where one would really want it. It's good that this mechanism is unavoidable, really, since most anything else will have the differential deflection problem.