J-Series Joists

[cedent]

I am trying to nail down a capacity for existing floor system that the architect wants to use for an alternate loading condition. I am looking for total and live load capacities for the following J series joists:

14J5's spanning a maximum of 20'-7"
14J4's spanning a maximum of 18'-2 1/2" + 1'-7" top chord extension.

I understand that these joists used A36 steel, and no design live load is listed on the 1963 drawings. I have a capacity estimate but I am looking for something more accurate.

Any help would be appreciated.

Thank you for your time and help.

 

[rholder98]

14J5, 21' span: 287 plf total
14J4, 18' span: 311 plf total (no mention of tcx)

From the SJI 60-Year Manual, pg. 256.

 

[cedent]

Thank you so much. The joist ended up being the limiting component on the strength of the floor system. The architect has since expanded the area to be modified and now I am also looking for information on:

18J8's spanning 27'-2", and
16J6's spanning 20'

 

[UcfSE]

You need to purchase the 75-year joist manual it seems.

 

[cedent]

Yes, I do. It is in fact on order.