Two way slab plan designations (1965)
Two way slab plan designations (1965)
(OP)
I am trying to determine the maximum allowable live load for a 7" thick concrete floor slab. Originally designed in 1965, I cannot determine the meaning of the abbreviations shown on the plan (please see attached).
For instance, "10 #5 BT", or "10 #5 ST".
Does anyone know what the "BT" and ST" designate?
I as assuming the bars are perpendicular to the arrow shown, based on the 20' bay dimension having (7)#5's rather than (6)#5's. But the bar placement is eluding me.
Has anyone seen or used these designations before? Thanks.
http://files.engineering.com/getfile.aspx?folder=bbe0c94b-62c0-4e7d-9b0c-e45a39780815&file=floor_investigation.pdf
For instance, "10 #5 BT", or "10 #5 ST".
Does anyone know what the "BT" and ST" designate?
I as assuming the bars are perpendicular to the arrow shown, based on the 20' bay dimension having (7)#5's rather than (6)#5's. But the bar placement is eluding me.
Has anyone seen or used these designations before? Thanks.
http://files.engineering.com/getfile.aspx?folder=bbe0c94b-62c0-4e7d-9b0c-e45a39780815&file=floor_investigation.pdf






RE: Two way slab plan designations (1965)
RE: Two way slab plan designations (1965)
RE: Two way slab plan designations (1965)
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Two way slab plan designations (1965)
Without the bending details, you don't know how much top steel you have, because you don't know whether the BT bars are bent one end or both.
RE: Two way slab plan designations (1965)
If there was an end span, the bent BT bars would be hooked at the edge of slab or beam.
Usually there was a typical slab or beam reinforcement diagram that would define all this.
RE: Two way slab plan designations (1965)
Can I assume you have read the above, and followed their good advice? Did you find a typical slab section on the drawings giving reinforcing layout and bend locations, etc. Also, look in the structural notes for some direction. Several rebar detailing books covered this, also. And, finally find a copy of the "CRSI Design Handbook, Vol. II", 1963 ACI Code, (green cover), Sec. 8, Flat Slabs, Flat Plates. CRSI covers what you need to know, and in fact you should be able to back out the moments and slab loads from their tables.
RE: Two way slab plan designations (1965)
Dik