Response mofication coefficient for mixed lateral system
Response mofication coefficient for mixed lateral system
(OP)
I am designing a five story building. The top four stories are load bearing wall system laterally supported by a combination of steel braced frames and a concrete shear wall. The bottom story is a flat plate post tensioned concrete slab supported laterally by concrete shear walls. What should my response modication coefficient be? I am designing to the IBC 2000.






RE: Response mofication coefficient for mixed lateral system
I have done 4 and 5 story table tops where 3 or 4 stories of wood framing on top of flat plate with concrete columns and concrete shear walls. We would assume the plate was the base for the wood structure and design the lateral for the wood using the appropriate R value for wood shear walls. Then we would apply the wood loads to the flat plate and design the concrete portion with it's appropriate R value.
RE: Response mofication coefficient for mixed lateral system
RE: Response mofication coefficient for mixed lateral system