Podium Slab on Columns Stability

[Contraflexure74]

Hi,

I have a light weight 3 storey timber frame building sitting on RC podium Slab. One end of the podium can be tied into an existing building which is braced. The opposite end is a free end which is not braced. My query is stability related.

Should I design the column and beam arrangement at podium level as portals in both directions?

Any tips appreciated.

Thanks.

J.

 

[271828]

Sketch of the plan?

 

[hokie66]

Without any shear walls or other bracing elements, I think portal action is what you have to do.

 

[Contraflexure74]

Thanks Hokie66. Thought the same.

 

[MotorCity]

If the lateral system of the existing building can resist the additional lateral forces imposed by the addition, no need to design as a portal frame in that direction.