Concrete Framing System For Finance/Business Building With Irregular Layout

[generick]

Hello All,

I've been tasked by my supervisor to come up with a preliminary framing plan for a 55 foot tall, 3-story building that will be used as a finance center. The preference of the building is to be entirely cast in place concrete and we are in a high seismic zone. I am in a stump trying to figure out where to lay out columns as I am looking to explore concrete special moment frames and/or flat slab. The skewed portion of the building is what throws me off the most. Does anybody who have framed out buildings with a similar layout to this have any recommendations right off the bat in terms of column placements?

The first picture below was my attempt at brainstorming possible column placements based on spans, I was looking to incorporate a beam/slab frame system, however it violates a lot of the spaces/functions.

Many thanks,

 

[BAretired]

Those column locations won't sit well with the architect. I would try to stick with his grid lines. Where they are too far apart, try to hit the partition locations with the intermediate columns.

With flat plate or flat slab, columns do not necessarily have to be perfectly aligned.

BA

 

[eng-erik]

Yes, placing columns in gridline intersection usually works best in my experience. How preliminary is the architect's grid layout? Is it possible to alter, or is this what you have to work with?

 

[generick]

@eng-erik It's pretty preliminary, we're talking about a conceptual plan moreso of a 10% design as of right now.
@BAretired Yes I agree, fortunately the 2nd and 3rd floor are pretty similar, however, the 1st floor differs too much. It's all trial and error now in terms of placing columns. Appreciate both your insight!