Unknown joist call out
Unknown joist call out
(OP)
I have run across some unknown open web steel joists and the call out on the original drawings is 18H192/80. They were built in the 1980s. I know that they are 18H joists but what I do not understand is the 192/80. Is this DL/LL or does it designate Total Load/LL? What confuses me more is that if I subtract the 20PSF for LL the remaining available load is under what is actually field verified. I have never seen joists called out this way. Can anyone help me with this? What do the numbers mean?
On a side note the joists were manufactured by Tex-Ark. They have been out of business for 20 years so I have hit a dead end there too.
Thanks
On a side note the joists were manufactured by Tex-Ark. They have been out of business for 20 years so I have hit a dead end there too.
Thanks






RE: Unknown joist call out
RE: Unknown joist call out
TL capacity = 192 plf
LL at L/360 deflection = 80 plf
RE: Unknown joist call out
What i meant by field verified was that I know what the actual dead loads are. And they are greater than the 112 plf I describe above.
I tried contacting SJI and they say they need the member measurements. I am trying to avoid doing this because of cost to the client but I may have to do it anyway.
Thanks
RE: Unknown joist call out
RE: Unknown joist call out
Are you sure that this is lightweight concrete and not lightweight insulating concrete? Big weight difference.
RE: Unknown joist call out
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Unknown joist call out
That is often why you will see weird on center spacing - like 5'-3.5'' or some other silly dimension. The joists are completely at their design max.
RE: Unknown joist call out