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RE: double angle vs starred (cruciform) angle

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Individual angles in compression have much higher KL/r values than when 2 are together. The way you get 2 angles to act together with a lower KL/r is connecting the 2 angles with stitch fasteners. Normally, engineers do not show stitch fasteners. Few are even aware that they exist. Generally, detailers add them.

There are some old studies indicating the effectiveness of stitch fasteners on back to back angles. I am not aware of any studies that show effective connection of the starred configuration, or how the stitch fastener would work.

Harold Sprague

From: raincat1(--nospam--at)
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: double angle vs starred (cruciform) angle Date: Fri, 16 Jun 2006 13:33:48 -0400

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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