wire mesh size
wire mesh size
(OP)
I just get a job to review the structural capacity of a one way concrete slab of a Bew York city building, built in 1960. The major reinfocement is wire mesh 5 6 3 4-1/2. I need to know what is the meaning of 5 6 3 4-1/2 ?
Thanks.
Jccgrace
Thanks.
Jccgrace






RE: wire mesh size
It's hard to be certain about the old nomenclature,
but I suspect the first numbers are mesh size (in.) and the second are wire size (gage).
For reference:
SPECIFICATIONS COVERING WELDED WIRE MESH
ASTM A82 Cold–Drawn Steel Wire for concrete reinforcement.
ASTM A185 Welded Wire Mesh for concrete reinforcing.
ASTM A496 Deformed Steel Wire for concrete reinforcing.
ASTM A497 Welded Deformed Steel Wire Mesh for concrete reinforcement
Wire sizes were previously designated by American Standard "Wire Gage Numbers," but unfortunately there is no direct correlation between the old gage and modern "W" numbers. For example a "6" gage wire is equivalent to W2.9 (0.029 in.) wire.
STYLE – Spacings and sizes of wire in standard welded wire mesh are identified by "Style". A typical designation is 6x12 W16xW8. This code denotes a welded wire mesh in which:
Spacing of longitudinal wires = 6"
Spacing of transverse wires = 12"
Size of longitudinal wires = W16 (0.16 sq. in.)
Size of transverse wires = W8 (0.08 sq. in.)
So 6 12 W16 W8
Also try:
http://rebar.ecn.purdue.edu/wwr/
RE: wire mesh size
Old CA SE
RE: wire mesh size
5 gauge @ 6"
3 gauge @ 4.5"
RE: wire mesh size
RE: wire mesh size
Personally, I don't know where Bew York is either.
Mike McCann
MMC Engineering
RE: wire mesh size
The referenced material may have been a very similar local material in that eara and area. Since it is a wire mesh, trying to determine the present capacity of a 40 year old slab can be difficult.
Take a few cores to dertmine the actual size and condition of the reinforcement if it can justify the professional analysis cost. - If it was a legally permitted building in New York City in 1960, there was some sort of permit or drawings to give you a lead as to the material specs. - They may not be what is really there.
Dick