The top flange is fully restrained. LTB for the top flange is not checked due to this:
The bottom flange is fully unrestrained (hence LTB length is set to full length), however only experiences compression for only a short segment length where there is hogging moment. The use of maximum...
To further demonstrate my point, I've changed the fixity at the ends to reduce the hogging moment to something nominal (circa 1kNm):
and as expected I'm getting massive failure in the bottom flange, as now it's using the max moment of 490kNm in the LTB check for the bottom flange...
Is this...
Thanks all, just for clarification I have a beam with fully restrained top flange, unrestrained bottom flange.
The beam is fixed ended, and so goes into hogging.
I am using Tekla Structural Designer, and there is an article here which gives some more explanation...
Hi,
I'm posing this question, as it seems that Tekla Structural Designer is using the maximum moment when checking the LTB of the bottom flange, for a fixed ended beam, this max moment in the section can be a sagging moment (i.e. bottom flange in tension), if it has the greater magnitude.
I...
