SLENDERNESS Error in STAAD output

[mfstructural]

Hi everyone, I'm working on a STAAD model. I have some horizontal bracing in the model along with vertical bracing also. I am getting a SLENDERNESS Error for some of the braces even though the slenderness ratio is less than 200. I calculated the ratio manually. I'm not understanding why I'm getting this as a failed member.

 

[dozer]

Which code are you using? The Australian code, for example, use 180 for the limit by default, if I remember correctly. To get around this, set the MAIN parameter to 200 for the members in question.

 

[mfstructural]

I'm using the AISC 2010 unified. It's odd because I'm designed several large platforms. The braces are about 25 feet give or take a couple feet. In one of the models no failures. In the other I get failures in a few of the braces in compression, but the code is the same I'm not using a different design methodology.