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RE: [StrucTX] Truss Diagonals in Compression (AASHTO)

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Title: RE: [StrucTX] Truss Diagonals in Compression (AASHTO)

Here's some text about the similar slenderness limit provision for tension members the AISC publication "A Guide to Engineering and Quality Criteria for Steel Structures: Common Questions Answered". It's about tension members, but I think the same basic logic applies.

Hope this helps you some.

Charlie

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"4.1.3. It is indicated in AISC LRFD Specification Section B7 that the slenderness ratio of a tension member should preferably not exceed 300. Why? Is this requirement strength related?

From AISC LRFD Specification Commentary Section B7, this recommended limit is "based on professional judgment and practical considerations of economics, ease of handling, and care required to minimize inadvertent damage during fabrication, transport and erection." It is further indicated that this requirement is not strength related.

Essentially, this rule also ensures that a non-pretensioned structural brace will be stiff enough that significant lateral deflection of the structure will not be required to activate the strength of the brace. As such, this requirement does not pertain to rod bracing, cable bracing and other light bracing systems that are fabricated and installed with draw to activate the brace."