roof plane bracing - forces?
roof plane bracing - forces?
(OP)
Hello,I want to avoid horizontal deflection and biaxial bending of steel beams that supports timber rafters. I want to transfer all horizontal load from roof to supporst (longitudinal concrete wall).
I m not allowed to use timber sheating, so Im using steel tapes (I dont know a proper expression in English) which are fixed on every rafter they pass.
Supports are horizontal unmovable. Force is 4 kN per rafter.
How can I calculate tension forces in the steel tape (bracing)?


I m not allowed to use timber sheating, so Im using steel tapes (I dont know a proper expression in English) which are fixed on every rafter they pass.
Supports are horizontal unmovable. Force is 4 kN per rafter.
How can I calculate tension forces in the steel tape (bracing)?








RE: roof plane bracing - forces?
RE: roof plane bracing - forces?
i dont think that can be considered as sheating...
RE: roof plane bracing - forces?
RE: roof plane bracing - forces?
RE: roof plane bracing - forces?
RE: roof plane bracing - forces?
Unless i misunderstand your intention
RE: roof plane bracing - forces?
Either way if your force is 4 KN per rafters your not getting that w/ nails, and that's not including the component perpendicular to the rafters you need to resist at the end of the strap. I guess if you had blocking between the rafters periodicsly, which it looks like you will need to support the metal panel that will be spanning g parallel to the rafters, you could reason that the compression force perpendicular to the rafters would be resolved through that. If it was me I would either design the top flange of the beam to span out of plane or tell them they are not allowed to build a roof structure without a functioning diaphram. That is unless the manufacturer has published shear values and connections for their panels.
RE: roof plane bracing - forces?
1) is the surface shown supported on four sides or two ?
2) as drawn are the steel beams bending (significantly) or working as caps (ie one in tension, one in compression) and isn't there a sheathing web to carry the in-plane shear ?
another day in paradise, or is paradise one day closer ?
RE: roof plane bracing - forces?
You could carry half the horizontal load in each beam.
If deflection is not a huge issue for the facade/building just design for strength and call it a day!