Interior Masonry Walls as Lateral

[Budding_SE]

I am able to design the exterior masonry walls marked in red as the lateral resisting system.
Would i have to design for the interior walls marked in yellow as part of the LFRS?
Can i keep them lightly reinforced and rely on the exterior for to take and transfer the lateral forced into the diaphragm?

 

[BridgeSmith]

It would seem to depend on the strength and stiffness of the diaphragm transferring the load to those walls. If the diaphragm is strong enough and stiff enough to carry the all the lateral loading from above through the exterior walls without significantly loading the interior ones, then the interior walls would not see that load. However, without some mechanism to isolate those interior walls from the diaphragm above, that diaphragm and the exterior walls would have to be incredibly stiff for the interior walls not to share the load.

 

[BAretired]

It would seem prudent to consider the walls marked in yellow as part of the lateral resistance system. Depending on the width of diaphragm, not shown on plan, it may be prudent to consider the walls on Gridlines 2 and 7 as part of the lateral resistance as well.

BA

 

[dik]

As BART notes... it would be prudent to do so... if it does cause you some 'heartburn' you can avoid making this part of the lateral system... tricky to provide lateral support for the walls at the roof and not have it transfer lateral load, though...

Dik