Concrete Filled Steel Columns

[jt12]

The new steel code has 115 pages of tables for axial capacity of composite concrete filled tubes, HSS, pipe columns, etc. From what I can see in the tables, there doesn't seem to be a whole lot of axial advantage to doing this. Does anybody use these, or is my steel code just 115 pages thicker than it needs to be?

 

[dik]

Enhanced fire resistance ratings... check with CIDECT

Dik

 

[Taro]

There's not much difference in axial load capacity for short, thick-walled tubes. But there's a big difference for slender tubes.