Portal frame bracing question
Portal frame bracing question
(OP)
Hello guys,
I've recently just made the transition from a geotechnical role into a structural role so my knowledge in structural engineering design is quite limited at the moment.
Quite a simple question i believe for some of you.
Just how important is wall bay bracing in the longitudinal direction when it comes to the design of portal frames. The stiffness of each column combined with the girts and purlins is surely enough to resist any force in this direction if i have a high number of bays should it not?
Any help much appreciated.
I've recently just made the transition from a geotechnical role into a structural role so my knowledge in structural engineering design is quite limited at the moment.
Quite a simple question i believe for some of you.
Just how important is wall bay bracing in the longitudinal direction when it comes to the design of portal frames. The stiffness of each column combined with the girts and purlins is surely enough to resist any force in this direction if i have a high number of bays should it not?
Any help much appreciated.






RE: Portal frame bracing question
Toby
RE: Portal frame bracing question
RE: Portal frame bracing question
I doubt it.
RE: Portal frame bracing question
RE: Portal frame bracing question
Its the difference between "it should work" and "it will work". The guy who doesn't know any better and cuts the bracing gets to stand back and say "this should work". As structural engineers, we don't get to say "it should work"...the bracing makes it a sure thing.
Keep in mind that tension bracing isn't the only way to stabilize the building in the longitudinal direction - you can use moment frames in both directions (maybe you have large openings in every bay). There are probably other options as well, but I'd say about 100% of the pre-eng buildings I've seen have been tension bracing and/or moment frames.
RE: Portal frame bracing question
RE: Portal frame bracing question
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RE: Portal frame bracing question
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think of it as nature, recycling...
Dik
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RE: Portal frame bracing question
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