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Old 19th July 2012, 09:23 AM   #1
Ed Hollway
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Default beam load on timber plate

I have calculated a steel beam with a reaction of 32.9Kn at ends. I want to sit this on an existing timber plate (compressive strength along the grain C16 - 17N/mm2). How can I calculate a bearing plate under the beam? Can anyone help?

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Old 19th July 2012, 09:50 AM   #2
Tony Bryer
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Default Re: beam load on timber plate

If your bearing plate is sitting on a timber wallplate, then the relevant bearing strength is perpendicular to the grain so 2.2/2.4 N/mm2 for C16/C24 respectively assuming no wane. You can use this figure, multiplied by an appropriate factor in the range 1.4-1.6, as the factored 'masonry' strength in the SuperBeam beam edit dialog bearing page though add a note to indicate what you've done. Note that the limiting factor may be the interface between the timber plate and what supports it.
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Old 19th July 2012, 10:26 AM   #3
Ed Hollway
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Default Re: beam load on timber plate

Thank you Tony. You mention the interface being significant - as far as I am aware it is a mortar bed on lightwieght 7 N/mm2 blocks. Do you anticipate an issue?
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Old 19th July 2012, 11:12 AM   #4
Tony Bryer
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Default Re: beam load on timber plate

Yes, the net bearing strength of the blocks is almost certainly going to be less than that of the timber so rather than get into a debate as to what degree of load spreading the timber provides, I would calculate the bearing plate size as if it bore directly on the blockwork.
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Old 19th July 2012, 11:53 AM   #5
Ed Hollway
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Thumbs up Re: beam load on timber plate

Excellent, thank you - confirmed what I had thought. Origional design was based on block work bearing the load, and will stand. Thank you again Tony
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