Client needs to do seismic upgrade (Seismic design category = D) to existing wood framed house. Basement story is half in the ground with wood pony walls on top of URM walls along the perimeter of the basement. I am considering adding full-height plywood shear walls installed along the inside face of the URM basement walls, but I am concerned about the stiffness compatibility between the wood shear walls and the URM. Is the stiffness compatibility issue adequately addressed by designing the new basement sheathed wood shear walls using the lower of the R values between the masonry and the wood (1.5 vs. 6.5)?
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