Steel frame with shear walls.

[hormozzadeh]

I have a steel structure in wich the latteral resisting system are shear walls.in our country there isn't any recommendation for such systems in our codes.if there is any in American codes AISC or UBC(IBC)I will be thanked if someone direct me.

BEST REGARDS

 

[UcfSE]

What kind of shearwalls are you asking about, what material are they?

 

[hormozzadeh]

thanks UcfSE for your attention.they are concrete shear walls.

 

[AggieYank]

There aren't recommendations for concrete shear walls in a steel frame because that is very uncommon. X-bracing is the preferred and better option for lateral resistance and could even take up the same wall cavity as the proposed shear walls.

If it really is necessary to use concrete shear walls in a steel frame, or this is already constructed, then we may be able to help you with specific questions. I don't know of a text specifically dealing with this.

 

[Taro]

Actually, that is a fairly common system in some areas. I have designed several buildings of this type.

The concrete shear walls are designed just as they would be in a typical concrete building. Steel collector beams are typically connected to the walls with large embedded steel plates and deformed bar anchors or welded rebar.

 

[AggieYank]

Interesting Taro. What is the advantage of using concrete shear walls in a steel framed building instead of x-bracing? It seems like it would involve more work than installing x-bracing would, and not be any more effective?

 

[Taro]

Sometimes it's a construction phasing issue. On one project, they were able to save several weeks by building the concrete walls while they were waiting for the steel to be fabricated.

Sometimes it's based on fire ratings and architectural considerations.

Sometimes it's because the only place for lateral elements is at the elevator/stair cores and concrete walls are needed for their stiffness.

 

[apsix]

Also it is not uncommon (in some parts of the world anyway) to use RC stair and lift shafts to provide bracing.
Reinforced block and precast concrete panels can also be used.

John