STEEL-CONCRETE MOMENT FRAME 1

[czar07]

hello,

Newbie here, practicing my design career.

I created a 2 story (recreational building) moment frame in which the ground floor columns are concrete and 1st floor beam and columns are steel (due to client requirements).
Plan dimension is 12mx39m
frame support = pinned
1st slab & roof = 150mm concrete on steel deck
limitation = 400mm deep concrete column along z-axis and 600mm wide along x-axis
queries;
1. Option 1 - 1st floor steel columns are moment released
- 1st floor Steel Girders will be on top of GF concrete columns and 1st floor steel columns will be on top steel girders, my problem is how to design connection of steel column on top of steel girder & the steel base plate of steel columns which i know that it is not the same in designing base plate resting on concrete.
- gf concrete column #123 requires 8616mm2
2. Option 2 - 1st floor Steel columns be fixed connected
- steel column will be on top of concrete columns and connection will be the same with normal steel column on pedestal, is this ok? all girders/beam will be connected on column flange/web, does this configuration be considered as FIXED?
- gf concrete column #123 requires 3072mm2 is more favorable for my concrete columns

I prefer option 2 but Im having a doubt with my assumed configuration of its connections.

Any comments or suggestions will be very helpful

 

[czar07]

Kootk & jayrod12

in the long run, it has been decided to bring it back with the original proposal which is steel moment frame.

thanks for your help kootk, jayrod12 and this forum