Purpose & function of joist bridging
Purpose & function of joist bridging
(OP)
What is the function of joist bridging pre & post erection? The reason I am asking is that on one of the jobs the contractor want to place a duct between 2 existing joists and wants to get rid of all the bridging. In my mind since the joists have bridging on one side, this should not be a problem but I am not sure.






RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
If the contractor removes the bridging in one bay, then the joists next to the unbraced bay can only get help from one other joist at the most, rather than a maximum of three. Point being that the floor system will be weaker next to the bay where the bridging is removed.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Purpose & function of joist bridging
I'm assuming that the existing bridging are horizontal and not X.
RE: Purpose & function of joist bridging
M^2: Would exchanging X-briding with straight lines acceptable in this case you think?
RE: Purpose & function of joist bridging
My comments were focused more toward wood joists which are closer together than steel joists. With steel joists ususlly spaced from 5 to 8 feet apart, it is mainly the lateral support of the bottom flange that is of concern here, which the horizontal members under the ducts will satisfy. I would still do what JAE suggested on either side though.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
If this is new construction, I would have the joist supplier answer the question
RE: Purpose & function of joist bridging
Longer Spans, Less Bridging and Better End Anchorage" has some good basic information on steel joists. This is the link to it http://www.structuremag.org/article.aspx?articleID....
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Purpose & function of joist bridging
Not sure why you that bridging is tension only. Is that a assumption based on the sizes of bridging angles?
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
I've been out of this for a while, but doesn't OSHA require erection bridging of the joists as they go in? Would that not require tension and compression capability.
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Purpose & function of joist bridging
RE: Purpose & function of joist bridging
Bar joists are commonly used for the floor joist in bars.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Purpose & function of joist bridging