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Old 14th December 2016, 11:42 AM   #1
Richard Moss
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Default Bearing Stresses on Blockwork Masonry

I've been using EuroBeam for quite a while. I'm just trying to get my head round Eurocode 6 Masonry design, and am finding that my manual padstone calculations are producing smaller pads on blockwork than EuroBeam. I have now found out why.

EuroBeam uses equation 3.1 for characteristic strength of masonry, with values for 'K' taken from Table 3.3. For concrete blockwork in general purpose mortar, this value is 0.55. But when the UK National Annex was amended in 2012, they amended this to K = 0.75 in Table NA.4 (specifically to give results broadly similar to BS 5628-1). So, to the UK National Annex, EuroBeam is producing padstones oversized by a factor of 0.75 / 0.55 = 1.36 on blockwork (brickwork is not affected)

Is it possible to configure EuroBeam to work to UK National Annex?
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Old 15th December 2016, 10:37 AM   #2
Tony Bryer
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Default Re: Bearing Stresses on Blockwork Masonry

Sorry, I'd missed this NA update. I'll be getting hold of a copy and updating the program in the near future. Thanks for the heads-up.
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Old 15th December 2016, 01:27 PM   #3
Richard Moss
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Default Re: Bearing Stresses on Blockwork Masonry

Thanks Tony.

While we're on the subject, can you explain EuroBeam's 'Enhanced bearing conditions', in particular the one which says that in order to use enhanced bearing stresses, bearing area shold be less than 2t squared? I can't find that anywhere in EC6, and we frequently use engineering brick padstones 330, 440, 550mm long on 100mm blockwork.

Richard
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Old 21st December 2016, 10:57 AM   #4
Tony Bryer
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Default Re: Bearing Stresses on Blockwork Masonry

Now working on this one, but the 2t squared rule is there because we have used BS EN1996-3, Simplified calculation methods for unreinforced masonry structures and this rule appears in 4.3, Simplified calculations for walls subjected to concentrated loads.
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Old 22nd December 2016, 01:57 PM   #5
Richard Moss
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Default Re: Bearing Stresses on Blockwork Masonry

Ah - I hadn't got as far as Part 3. Early days!
Happy Christmas
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Old 3rd January 2017, 10:04 AM   #6
motorphotos
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Default Re: Bearing Stresses on Blockwork Masonry

ahhh how I dream of the old days

a 3.5 n/mm2 block had a stress of 0.35 N/mm2

so padstone stress max would be 0.35 x 2 (shape factor) x 1.5 (local bearing stress max)

so max stress under padstone 0.35 x 2 x 1.5 = 1.05 N/mm2

which would normally be limited to 0.8 n/mm2 to allow for workmanship

Happy new year all

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Old 27th January 2017, 10:32 AM   #7
Tony Bryer
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Default Re: Bearing Stresses on Blockwork Masonry

EuroBeam 3.01a incorporating the updated K values is now available for download via the Check for Updates option. Sorry it's taken long than hoped. Full change list: http://www.eurobeam.co.uk/euroeechanges.htm
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