What is the purpose of cold-formed steel floor joist bridging?
What is the purpose of cold-formed steel floor joist bridging?
(OP)
When framing floors with cold-formed steel joists, we specify that bridging be installed at 8' on center. I know that bridging is important to keep the joists stable during construction, but what is the purpose of the bridging (specifically the bridging bracing the bottom flanges of the floor joists) after the floor sheathing is in place? I can't find anything in the AISI cold-formed steel publications that clearly states the required spacing of floor joist bridging. Joist catalogs usually have footnotes in the span tables recommending bridging at 7' or 8' maximum spacing.






RE: What is the purpose of cold-formed steel floor joist bridging?
RE: What is the purpose of cold-formed steel floor joist bridging?
RE: What is the purpose of cold-formed steel floor joist bridging?
I was on a job that had really long joist spans (approx 25') They all collapsed as they were putting the sheathing on. The would not have happened if block and strap and every other joist was flipped.
RE: What is the purpose of cold-formed steel floor joist bridging?
What if I have a 9' span and the recommended spacing of bridging is 8'? Do I need a row of bridging or can I just reduce the usable flexural strength - and how do I compute the reduced flexural strength for the 9' span without bridging?
RE: What is the purpose of cold-formed steel floor joist bridging?
I had a grid interior to a building with a relatively long span. No sheeting, very light loads.
I ended up specifying some conservative bridging, but it was probably overkill.
RE: What is the purpose of cold-formed steel floor joist bridging?
RE: What is the purpose of cold-formed steel floor joist bridging?
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: What is the purpose of cold-formed steel floor joist bridging?
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RE: What is the purpose of cold-formed steel floor joist bridging?