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The rule of unbraced length

Question:

Hi,

May I ask what is the rule for program to automatically calculate unbraced length of member?
As below figure, I thought the unbraced length of this column member is Ly=4.8 & Lz=8.4

But program indicated that Ly=3.6 & Lz=8.4

Could you please tell me why program choice the shorter part as unbraced length?

Thanks for your assistance
Best regards,

Answer:

Hello,

Unbraced length is defined as follow image.

In your model file, the element no.41&44 is assigned as a member. Therefore, those separated elements are designed as one member using the Member Assignment function. Among them element no.44 is unfavorable for the load combination, program design a member for the element no.44., so the Ly is printed as 3.6m. Please refer to the below result table.

Thank you.

Best regards,
Jihong Hwang

Creation date: 7/24/2018 10:53 PM Updated: 7/25/2018 8:23 AM

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	DataImage21.png 151 KB
	DataImage49.png 84 KB
	DataImage41.png 28 KB
	DataImage46.png 52 KB
	LyLz.mgb 389 KB