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Old 7th June 2017, 09:42 AM   #1
Richard Moss
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Default Bug in Lateral Torsional Buckling Resistance

Hi Tony

I think we've found a bug in the calculation for lateral torsional buckling capacity of unrestrained beams. The value for Mcr seems to be calculated for the buckling length = span, regardless of which end conditions have been applied. This leads to unsafe results where the end conditions result in buckling length greater than the span i.e. conditions 6 and 7 (and conservative results where the buckling length is less than 1.0L).

Could you look at this fairly quickly please and let us know your thoughts?

Thanks

Richard
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Old 7th June 2017, 01:16 PM   #2
Tony Bryer
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Default Re: Bug in Lateral Torsional Buckling Resistance

I've had a quick look and it doesn't look right. I'll check it out properly tomorrow - late evening here. Thanks for the heads up.
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Old 8th June 2017, 11:16 AM   #3
Tony Bryer
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Default Re: Bug in Lateral Torsional Buckling Resistance

Yes, I can confirm it's not right. Fix will be posted over the weekend.
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Old 12th June 2017, 11:38 AM   #4
Tony Bryer
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Default Re: Bug in Lateral Torsional Buckling Resistance

Taken a little longer, plus several other fixes being done, so now hopefully tomorrow
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Old 13th June 2017, 01:28 PM   #5
Tony Bryer
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Default Re: Bug in Lateral Torsional Buckling Resistance

I've just uploaded 3.03a which corrects this. Thanks again for identifying this.
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Old 13th June 2017, 02:39 PM   #6
Richard Moss
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Default Re: Bug in Lateral Torsional Buckling Resistance

Thanks Tony - that's looking better! I can't claim any credit - we are indebted to young graduate Michael Newell who joined us fresh from uni last week and spotted the issue.

Richard
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