existing wwf strength?
existing wwf strength?
(OP)
I am analyzing an existing elevated slab with wwf placed at top and bottom. The building was designed in the early 1950's and I cannot find the strength of the rebar or mesh on the drawings. Can somebody tell me what strength of mesh/or rebar was readily used during that time period?
RE: existing wwf strength?
Reinforcing steel of that era would have most likely been grade 33, 40, or 50 (ksi yield strengths). My guess is grade 40 for a building in the 1950's.
Welded wire mesh is a little harder. I think it depends on whether the mesh is smooth wire or deformed, and square or round wires were used. Smooth round wire mesh today, I believe, is made from 65 ksi steel, and 70 ksi steel if deformed. A number of years ago, our office did some load calculations on an old bldg built in 1919, and we used 50 ksi for square wire mesh, but I'm not sure where the design engineer got his information. To be on the safe side, I'd be conservative with it and stay on the low side, (ie. 50 to 60 ksi).
Good luck.
RE: existing wwf strength?