precast panel=reinforcement palced centrally in panel or a

huangyhg

precast panel=reinforcement palced centrally in panel or at
  in precast panel or concrete panel for lift shaft, reinforcement is normally placed centrally or at the top and bottom of the panel ??
thkx.
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how thick is your panel?
depends also on whether loads are applied from one side only or from both sides.
with precast, your loads are applied from both sides.  negative moment on the face of the panel during stripping, both positive and negative moments on the face of the panel during wind pressure and wind suction, and don't forget shipping and handling.  try to push the architect for a thickness that will allow you to double reiforce the panel.  you can do this by referencing the pci manual.  typically with precast, specs. will require an uncracked section.  we all know that reinforcement is useless unless the panel cracks, and with precast, cracking stress is lowered to 5*sqrt. fc'.  good luck.