UcfSE,
I have a rafter (moment frame) that spans 207' with 18' bays, 12 bays total. To help reduce thrust, there is a carry beam located about 70' in from one sidewall. This carry beam is 90' long and supports 4 rafters, each imparting about an 80 kip point load on the carry beam. The carry...
Here is a follow up to the above questions. If I have a rafter that sits on top of a carry beam (the carry beam top flange is in compression) and I have a flange brace that runs from the bottom flange of the carry beam back up to the rafter (to restrain the bottom flange for uplift loads), what...
So would it be safe to say that the lateral brace forces are somewhat localized, and tend to cancel themselves out internally, as opposed to seismic bracing forces that have to be added together and braced out directly to the foundation? In my example I am dealing with a 5 kip brace force at 3...
In large span beams with large moments, the cumulative brace force could far exceed the LFRS forces, which is the case I have. Since the lateral force is generated from lateral movement of the flange during buckling, and the direction that it buckles could depend on materal inconsistencies...
In a multiple beam system, would the flange force be cumulative then? This could be quite a large force. If it is cumulative and it winds up in the deck diaphragm, it would then have to be braced out, is this correct.
I have a question regarding the flange brace force on a beam. Lets say I have a beam in bending due to gravity loading, the flange brace force on the compression flange is 1% to 2% of the flange force (moment/depth). So I have applied a gravity load to a beam and now have a lateral load to...
