basmest retain wall as shear wall

[gyroman10]

i am modeling a three story irregular plan building (plan attached) the basement walls modeled with frame acts as a shearwall. This shear wall modeled with frames causes a offset of C.R. from C.M more than 5%. my question is that what detailing could be used so that the retaining walls dont act as shear walls? when these walls are removed the C.R. comes within 5% of C.M.

 

[Lion06]

Are they concrete or masonry retaining walls? What does your edge of slab detail look like where the diaphragm is connecting to the walls?

 

[prsconsultant]

You don't need any frame beam members at the 1st elevated floor level (i.e., level at the top of basement walls). You can continue all lateral columns to basement level. Model all beams at this level as gravity beams. Make sure you detail the connection of slab to shear walls to acheive the required shear transfer. Also, you have to design the walls for horizontal shear and overturning moments due to lateral seismic / wind forces.

 

[gyroman10]

StructuralEIT

its a concrete wall, and the slab edges "hooks" into the wall, the wall is providing a line support to the slabs.

 

[Lion06]

So, the slab edge does bear on the wall? I am assuming then that the slab is doweled into the wall? If it is, I can't imagine how you can get the walls to NOT act as shear walls. If no dowels are provided from slab to wall, provide some kind of bond breaker on top of the wall before the slab is poured so that no shear can get taken into the walls.