Hollowcore Slab & CMU Wall

[rook1]

Im a newbie on etabs.. id like to design a 5storey hotel.
the walls will be made from 10" CMU and 8" CMU on the top 3 floors.. The CMU are to carry all vertical loads including the lateral forces.. the slab of the entire bldg is hollowcore concrete planks.
any suggestions on wat properties to assign to the wall and slab?
help much appreciated!

 

[Murali27]

Hi rook1

Hollow core concrete planks -> Membrane properties

Wall -> Assigned membrane or shell properties
Can be idealized as equivalent thickness by using stiffness reduction factors.

Hope this helps,Murali

 

[rook1]

Can be idealized as equivalent thickness by using stiffness reduction factors <-- please be specific with this. thanx!
i saw a post with the equivalent thickness. but the CMU we are using are 10" and 8".. the post only mentioned 6" CMU..

should all walls be assigned pier section then be assigned as "should be checked"?

 

[Murali27]

Hi Rook1

Using stiffness reduction factors, we can assign the exact properties of 10"CMU wall as a equivalent rectangular concrete wall. (Area, Ix, Iy,etc).

Yes, we need to assign pier labels to extract the forces out and the same needs to be designed as per CMU design procedure,

Hope this helps