Inclination for Flat Portal Frame Decking (Steel)
Inclination for Flat Portal Frame Decking (Steel)
(OP)
Hi all struc eng
How one can design a really small inclination (in the decking to direct rainwater) WITHOUT inclining the beams/rafters.
Shall one design different purlin sizes? Are there any other suitable and economical solutions?
thanks in advance
How one can design a really small inclination (in the decking to direct rainwater) WITHOUT inclining the beams/rafters.
Shall one design different purlin sizes? Are there any other suitable and economical solutions?
thanks in advance






RE: Inclination for Flat Portal Frame Decking (Steel)
RE: Inclination for Flat Portal Frame Decking (Steel)
When the purlins are at or near the top of the rafter then the cleats can be plats as normal but as they get longer you will need up to 3 inch angles to allow for the slenderness and cantilver effects (from the out of plane restraint forces).
Your fly braces will also need to be larger than usual due to the greater slenderness.
RE: Inclination for Flat Portal Frame Decking (Steel)
If you are insulating the roof, you can provide a slope in the rigid insulation.
RE: Inclination for Flat Portal Frame Decking (Steel)