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Old 1st December 2014, 02:44 PM   #1
Ed Hollway
Join Date: May 2008
Posts: 10
Default Four structural members

Hi, I have designed a beam for a new external wall opening for an extension with two 254 x 146 x 37 UB's. These two will be bolted together. I have been asked by builder if I can justify having four FPC's instead. Superbeam does not have an option for 4 members. Can I half the load for 2 FPC's and then assume and 4 FPC's will take the whole load?

The requirement is because they will need to carry the beams by hand around a rather awkward route to the back of the house.

Ed Hollway
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Old 2nd December 2014, 09:26 AM   #2
Tony Bryer
Join Date: Apr 2008
Location: Melbourne, Australia
Posts: 869
Default Re: Four structural members

In principle there's no reason why you can't do this but I'd be surprised if it were the best option. As with twin and triple beams you need to bolt the members together at 1.5m max c/s and if you're going to check by dividing the load equally between the members you need to be sure that this reasonably reflects what will happen in practice.
Tony Bryer, Greentram Software Pty Ltd
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