Historic Joist Designation 1

[Teguci]

I have an existing architectural drawing (c1960) with a joist designation of:
18 LA06
These joists are at 3'-0" on center spanning 23'-6"
The building is located in the northern part of New Jersey. Just went through SlideRuleEra's list of catelogs and couldn't find it.

Does anybody know what this designation is? The Architect got the other steel joist designations correct.

 

[vandede427]

My SJI manual with all the old load tables has a 1961 publication with the LA series. I don't see an LA series before that.

The data from that table is

18LA06 spanning 25' rated for 556 plf total load, 7.14k end reaction, 19 plf self weight, based on 22 ksi allowable stress.