Sep 15, 2016 5:19 pm
I am proposing to join 8m lengths of 150x50x2 RHS bearers together by butt welding them to form a continuos beam, some up to around 30m long. The certifying Engineer said that poses no problem but did suggest that I try to keep the joint away from mid span. When the Council building inspector saw one of these joints he said he had never seen it before and thus, concerned about it.
Is this acceptable practice? Personally, as long as the weld is a full strength butt weld I cannot see a problem. The inspector said just carry on and he will speak to the Engineer......If there is a problem, I could weld say a 400 mm long piece of 50x5 flat bar across the bottom of the joint to take the tensile load off the weld.
Re: Butt Welding 150x50x2 RHS Bearers???3
Sep 16, 2016 12:41 pm
What length spans are in your build? Cant imagine they would be very wide using those beams.
If the engineer says it is ok, then it is. However it is understandable why he does not want the join midspan.
Do a test - make a butt weld, then have it in the middle of a span, and stand on it and jump and and down. Id imagine it will flex, meaning vertical movement will stress the weld, and potentially weaken it to the point of cracking.
Id be welding two cleats of 150 x 200 across the weld on the wide sides (not the short sides) to keep it rigid. Talk to your engineer some more about it.
Re: Butt Welding 150x50x2 RHS Bearers???4
Sep 16, 2016 4:29 pm
That is correct (trust your engineer) for continuous beams over supports the max bending moments are at the middle of the span (sagging) and at the supports(hogging) ..generally welds are placed at a third of the span.
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Re: Butt Welding 150x50x2 RHS Bearers???6
Dec 13, 2016 12:06 pm
** I am not an engineer, but i also don't trust your engineer.
30 meter span, far out,
I am spanning 6 meters with no load and I need 250 C section.
You are going 5 times the span with RHS?? RHS isnt made to do what you are trying to do. It will end up being unnecessarily heavier than for the span than if you used the correct beam for the job, C or I beam.
Are you sure you hired an engineer and not a 4 year old in Kindergarten?
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Choppy182Caesarstone - mitred or butt joint waterfall ends?Caesarstone - mitred or butt joint waterfall ends?
Mitre is the way to go. Look so much better no doubt about it.