Reinforcement of existing steel joist.
Reinforcement of existing steel joist.
(OP)
My issue is that I have an open web joist (LH series) that is over stressed about 10%. I believe I have two options at this point.
A. I can "cover plate" the existing joist.
B. try to spread the RTU weight over additional joists by "x-bridging" between additional joist. I think this would be the preferred option but I'm a little unsure how much "help" I can get from the additional joists.
If anyone has any insight to this issue I would greatly appreciated it.
A. I can "cover plate" the existing joist.
B. try to spread the RTU weight over additional joists by "x-bridging" between additional joist. I think this would be the preferred option but I'm a little unsure how much "help" I can get from the additional joists.
If anyone has any insight to this issue I would greatly appreciated it.





RE: Reinforcement of existing steel joist.
SJI Technical Digest No. 12
RE: Reinforcement of existing steel joist.
Get creative with your new support beams - you might be able to tie back to existing I-beam or girder joist to pick up to as much as 50% of the load?? Spreading out the load over 4 joists will cut down your overload to like 2.5%!!! - IF done right.
Think outside the box a bit - you might be surprised.
RE: Reinforcement of existing steel joist.
We had to either relocate the equipment if acceptable to other parties, spread out the load, or come up with a dunnage to support the new equipment. Budget was never an issue.
While designing we always kept a provision of additional point load of 2 kips anywhere along the span of the joists, but accessibility for strengthening purposes was always an issue.
RE: Reinforcement of existing steel joist.
Designing with Vulcraft Steel Joists, Joist Girders and Steel Deck
RE: Reinforcement of existing steel joist.
For instance if you were to hang a load from below the joist, using a beam between two joists, the load would normally be distributed to each joist (based on distance from the load). If you were to use a larger spreader beam you could spread the load out to additional joists. It has to do with relative stiffness of the joists vs. the spreader beam.
They reviewed this at a seminar. I would assume this is in the SJI technical digest that JAE identified.
RE: Reinforcement of existing steel joist.
www.idecharlotte.com
RE: Reinforcement of existing steel joist.
RE: Reinforcement of existing steel joist.