Flange width has changed by strengthening the compression flange and strengthening the tensile flange.
翼缘宽度变化按加强受压翼缘和加强受拉翼缘考虑。
Lipped channel and Z section with compression flange not fully effective, have no more any symmetry, so that their stress analysis become quite complicated.
而翼缘非全部有效的卷边槽钢、Z形钢毫无对称性，使应力分析计算十分复杂。
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