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Non-compact sections

Compared to compact structural steel sections, allowable bending stress that can be used for sections that are identified as non-compact
A. must be higher, B. must be reduced
C. the same, D. always 10% less
E. typically 10% greater

B. must be reduced. W21x48, W14x99, W12x65, W10x12, W8x31, W8x10, W6x15, W6x9, W6x8.5, and M4x6 are examples of the limited number of shapes identified as non-compact, determined by web/flange width to thickness ratios and yield strength.
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