Horizontal floor bracing
Horizontal floor bracing
(OP)
I have horizontal floor bracing (grating floor-no diaphragm) to transfer seismic loads to my exterior wall vertical bracing. The angle shown is resisting 53 kips seismic. I have sketched two possible bracing senarios:
W.P. at column flange - much easier detail, however creates a torsional/twist load in my column.
W.P at column centroid of column - much uglier detail.
Does someone have a better detail with W.P. at column centroid?
Thanks,
Jeff
W.P. at column flange - much easier detail, however creates a torsional/twist load in my column.
W.P at column centroid of column - much uglier detail.
Does someone have a better detail with W.P. at column centroid?
Thanks,
Jeff






RE: Horizontal floor bracing
You would need to ensure that the beam taking the eccentric the brace load can handle the weak axis shear & bending. Probably some arrangement of stiffeners and plates to drag the load into the beam flanges.
Also be careful with your beam-column connections. The double angle connections shown might not be up to the task.
RE: Horizontal floor bracing
RE: Horizontal floor bracing
I don't care for either one. I'm not sure that your gusset plate can handle the moment. If it can, are you connecting to the beam web or the flange? If the web, then you need some web stiffening. If all that works, then I don't think the clip angles will transmit moment. Likely, the moment component goes into the beam as a concentrated moment that is taken out as a couple at the beam ends.
Are you trying to optimize? save installation labor? If not, I would combine both of your details and attach to both beams. Make the line of action through the column center and the load gets taken out in shear through both beams (53 kips x cos(angle)).
Maybe I'm not visualizing well tonight, but I can't see how to do a vertical cleat like hokie says without interfering with clip angles and bolt access.
Hope this helps.
RE: Horizontal floor bracing
RE: Horizontal floor bracing
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Horizontal floor bracing
I don't know much about statistics, but I do know that if something has a 50-50 chance of going wrong, 9 times out of 10 it will.
RE: Horizontal floor bracing
Thanks for all the replies!
Jeff
RE: Horizontal floor bracing
RE: Horizontal floor bracing
Aslo, hokie: why are double angle connections not used in Australia? Is it just the standard practice or is there an objection to the connection perfomance?
RE: Horizontal floor bracing
RE: Horizontal floor bracing
Good question, and I don't really know the answer. Double angles aren't prohibited, just rarely used. Probably just the way the fabrication industry here evolved. The connections we use don't have the flexibility of double angles, but then we don't have much in the way of seismic concerns.
RE: Horizontal floor bracing
RE: Horizontal floor bracing
RE: Horizontal floor bracing
Are "Web Cleats" similar to "shear tabs"?
RE: Horizontal floor bracing
RE: Horizontal floor bracing
http://ww
I did not know they were called "boomerang gussets". Interesting!