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Old 13th February 2012, 12:53 PM   #1
Martin Clifton
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Join Date: Feb 2010
Posts: 26
Default Steel beam bearing

Tony,

using the steel beam design to BS449, i have noticed a 'stiff bearing length' required when the beam is supported on it's bottom flange.

say i have a reaction of 40kN using a 178 x 102 UB - it says i need a 'stiff bearing length' of 13mm. What in practice does this actually mean.

the beam would be supported on a wall, say 100mm wide. So ignoring the wall, the beam would have a 100 x 102mm bearing area.

is the wall considered a 'stiff bearing' ??

I am not sure what the 13mm means - please can you help.

many thanks

Martin
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Old 14th February 2012, 10:46 AM   #2
Tony Bryer
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Default Re: Steel beam bearing

It means what it says: to stay within web buckling and crushing limits for an unstiffened web, the bearing must be have a minimum stiff length of 13mm. In your case this is not a problem since you have 100mm, but if your beam was sitting on a very small seating angle welded to a column it just could be. With certain sections (high web height/thickness ratio) the minimum stiff bearing length might be a material factor, but for domestic scale structures it rarely is. If you get a value of zero, this means that web buckling or crushing will not happen for the design reaction load.
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Old 15th February 2012, 10:20 AM   #3
Martin Clifton
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Default Re: Steel beam bearing

Thanks Tony - makes complete sense
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