How RAM SS designs composite beams with custom sections...

Hi,

I'm designing composite beams using custom I-beams (not typical W's)  with smaller top flanges and bigger bottom flanges.

Since the resulting centroid of steel area is now lower, the lever-arm is larger. Hence greater bending strength.

Does RAM account for this? Or is it simply taking the lever arm to D/2?  (D=steel beam depth)

Thanks in advance...