dar d=c d=ds=do bs=bo Typical steel concrete composite columns. c) d) (a)I steel profile fully encased in concrete. (b)I steel profile partially encased in concrete. (c)Hollow steel section filled of concrete. (d)Circular steel section filled of concrete. (a) I steel profile fully encased in concrete. (b) I steel profile partially encased in concrete. (c) Hollow steel section filled of concrete. (d) Circular steel section filled of concrete. Typical steel concrete composite columns