In {TAIL ~ the cross section}, the lower flange is thicker than the upper flange and {HEAD ~ the lower flange} is wider than the upper flange, and the neutral axis of upward/downward bending 
In { TAIL ~ the cross section } , the lower flange is thicker than the upper flange and { HEAD ~ the lower flange } is wider than the upper flange , and the neutral axis of upward / downward bending
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH