Concrete Structure with Steel Roof / Joist Girder to RC Column
Concrete Structure with Steel Roof / Joist Girder to RC Column
(OP)
2-story bldg, where 1st and 2nd floor occupancy requires concrete and steel roof is preferred by the client. Building will have interior elevator/stair and exterior RC shear walls. What are the some of the pitfalls to look out for or suggestions to permit a steel roof with concrete columns. With the seismic roof shear relatively low, I am looking at 4-anchor embed/bearing plates at the top of the columns. The girders can be designed for a large axial force, but only in one direction. It the other direction, I am looking at some form of tie-joist, which can also be designed for an axial force that would brace the top of column and not permit a weak-beam/strong column buckling condition. Thanks for any feedback in advance.






RE: Concrete Structure with Steel Roof / Joist Girder to RC Column
And why can't you just have steel columns for the top floor? If the architect wants a consistent facade this can be achieved with tophats/cladding.
RE: Concrete Structure with Steel Roof / Joist Girder to RC Column
One thing that I like about the system in comparison to using steel columns is that you don't need to worry about that awkward condition where you're trying to generate a concealed, yet erectable, column base condition.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.