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