A STEEL BEAM FAILED FOR CONDITION Cl.D1

Hello Everyone,

I would like to seek help from the expert here.
I am designing a flexural member but it fails in Clause D1 which is a slenderness limit for tension members.

As per STAAD Connect Output, the actual slenderness ratio is 70.678 which is less than 200 for compression element and much less than 300 for tension members.
How come that Clause D1 governs? Does anyone have any ideas regarding this mode of failure?

Attached herewith is the TRACT 2 Output of STAAD Connect for your reference to my questions.

I am hoping for your kind help.

Thank you.

Thankfully yours,

Glenn



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