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double angle vs starred (cruciform) angle

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Using equal leg angles, the slenderness ratio of a starred angle (2 angles joined as a cruciform) is significantly increase (in the weaker axis) compared to double angle (joined at the legs). This should make the starred angle a better compression member than the double angle. However, we don't see the starred angle being used as a bracing member. Is there any reason for this? Thanks!
Rainier C. Catubig
San Diego, California

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