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steel curved beams for roof

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  • 26-04-2014 3:27pm
    #1
    Selfbuilder14
    Registered Users Posts: 59 ✭✭


    We are building a curved barn shaped roof with a 2.25 radius, centre point 1m below springing points. Any cost effective solutions as engineer has called up a 203 X 133 ub 23 curved against the flange. Any other cost effective solutions


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    #2
    kieran.
    Registered Users Posts: 1,174 ✭✭✭kieran.


    What span is the building gable to gable? Are Galv purlins an option without the primary steel work? If primary steel is necessary a faceted/cranked beam instead of a curved beam will be cheaper you could also look to change the UB to a SHS/RHS as the will be less fabrication.

    What is the internal/external finish of the roof


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    #3
    Selfbuilder14
    Registered Users Posts: 59 ✭✭Selfbuilder14


    kieran. wrote: »
    What span is the building gable to gablfe Galv purlins an option without the primary steel work? If primary steel is necessary a faceted/cranked beam instead of a curved beam will be cheaper you could also look to change the UB to a SHS/RHS as the will be less fabrication.

    What is the internal/external finish of the roof


    Thanks. Single ply membrane external and plasterboard internal. span is 9m And difficult to set out without a curved beam. Purlins are c16 200 X 60 timber. There is a cleat welded between the flanges to connect purlins to the beam.


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    #4
    galwaytt
    Registered Users Posts: 12,766 ✭✭✭✭galwaytt


    How about a Glulam beam ?

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



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    #5
    kieran.
    Registered Users Posts: 1,174 ✭✭✭kieran.


    A cast in situ curved reinforced concrete beam would also be an option at that span if the engineer can provide the vertical supports at the external load points. I would imagine that an engineer designed SHS with facets and welded cleats for purlins would be the simplest and cheapest solution. My tip for doing a tight radius like yours would be to cross laminate the plywood i.e three light layers of plywood glued and screwed in staggered layers to form the curve across the purlins rather than one larger layer plywood as this will give you a more rounded finsihed curve.


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    #6
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,859 Mod ✭✭✭✭DOCARCH


    Mod Note: Please bear in mind on this forum that structural advice/suggestions with regard to detailed structural solutions are not permitted.


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    #7
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 17,859 Mod ✭✭✭✭DOCARCH


    Good man Kieran. Self moderation is always the best! :)


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    #8
    galwaytt
    Registered Users Posts: 12,766 ✭✭✭✭galwaytt


    DOCARCH wrote: »
    Mod Note: Please bear in mind on this forum that structural advice/suggestions with regard to detailed structural solutions are not permitted.

    Agreed. Not specifying anything in particular wrt the Glulam suggestion above, just as a building material. S.E. can size and specify grade.


    Fwiw, here's one way we did one using steel about 5 years ago - albeit a flat roof underneath. It was purely to deliver a curve over.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



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    #9
    MOBH
    Registered Users Posts: 19 ✭MOBH


    Guys - could you tell me is there much difference in price for a standard roof and curved? We have one section of our build curved and one section standard. Worried that the curved part will be v expensive. We are only going for planning permission at the moment and haven't submitted our final submission yet. Just looking for some advise on it, TIA


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    #10
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    https://www.boards.ie/vbulletin/showthread.php?t=2057851360


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