Reduced section size of columns/walls on successive floors

[MSUK90]

Does any code has limitations on reduction in column/wall sections from base section? The building I am reviewing has a lot of columns and walls changing size regularly along its height. Even though all the requirements for strength and serviceability are met, I am still worried if the reduced sections are meeting the codal provisions(if any).. The building is 11 story high(commercial) and is located in seismic zone 2B(UBC) with soil proflie type S_c. Seismic loads are applied as per UBC 97 and Wind loads as per ASCE 7-05. Design is done to ACI.

 

[KootK]

There are no code limitions on this that I'm aware of. The joints at the transitions just need to calc out.

 

[r13]

Why you suspected there would be a problem if every thing checked out? If it is the other way around, then I would be interested in how it was handled.

 

[MSUK90]

There are no code limitions on this that I'm aware of. The joints at the transitions just need to calc out.

Thank you KootK. Just one more clearance, if the upper floor column has eccentricity in both axes with the column below, I have to add additional moments due to eccentricity to design the base column right?

 

[MSUK90]

Why you suspected there would be a problem if every thing checked out? If it is the other way around, then I would be interested in how it was handled.

I just got a thought as the size reduction is too much IMO.

 

[dhengr]

Saifuddin18:
I wouldn’t overdo it. Contractors dislike changing/rebuilding column forms for every floor, because of a small size change. Then, only change one dimension, so the other two form sides can still be reused. Wall thickness just involves changing the thickness spacers.

 

[MSUK90]

I wouldn’t overdo it. Contractors dislike changing/rebuilding column forms for every floor, because of a small size change. Then, only change one dimension, so the other two form sides can still be reused. Wall thickness just involves changing the thickness spacers

Thanks for the reply @dhengr. I know about the costs and difficulties the contractor may face but I didn't actually designed the structure, I am reviewing it. The fact I was looking for is regarding any codal provisions limiting the reductions in sizes but it seems there is no such clause in any code.