Cr repetitve factor for a floor joist with a point load
Cr repetitve factor for a floor joist with a point load
(OP)
Gents-
I have an existing 2x12 @12" o/c framed floor with diagonal tongue and groove plank deck that is 1" thick. I am checking a few of the floor joists for some new point loads arising from proposed mep equipment. The point loads occur every 4' each way in plan. Can anyone agree that it is ok to use the Cr factor of 1.15 on Fb for the joists in this situation? The deck is too thin to perform a lateral distibution of load for moment per the old NDS section 15.1, but my understanding is that it is ok instead to use Cr=1.15. Any thoughts?
I have an existing 2x12 @12" o/c framed floor with diagonal tongue and groove plank deck that is 1" thick. I am checking a few of the floor joists for some new point loads arising from proposed mep equipment. The point loads occur every 4' each way in plan. Can anyone agree that it is ok to use the Cr factor of 1.15 on Fb for the joists in this situation? The deck is too thin to perform a lateral distibution of load for moment per the old NDS section 15.1, but my understanding is that it is ok instead to use Cr=1.15. Any thoughts?





RE: Cr repetitve factor for a floor joist with a point load
Do you also have bridging? This also helps to distribute the loading.
RE: Cr repetitve factor for a floor joist with a point load
RE: Cr repetitve factor for a floor joist with a point load
RE: Cr repetitve factor for a floor joist with a point load
Never, but never question engineer's judgement
RE: Cr repetitve factor for a floor joist with a point load
RE: Cr repetitve factor for a floor joist with a point load
You only use one load duration factor per load combination. You use the one corresponding to the shortest load duration. See the NDS commentary.