floor loading capacity at base plate

huangyhg

floor loading capacity at base plate
i want to errect a structural steel mezzanine on an existing slab on grade.  the slab is 5" thick with 6x6 10/10 galvanized wire mesh reinforcement.  concrete design mix was 3000 psi.the sub grade is lime rock compacted to 95%.  the column baseplates are 10"x10" with maximum floor loading at the baseplate of 66psi.  can the 5" slab support the 66 psi loading of the baseplates without modification?
flaeng,
  i wasn't quite sure how to answer your post, or even if i should, since you are essentially looking for free engineering services.  i would be surprised if anyone answered this post for that reason.  it is my understanding that this forum was intended for the discussion of issues related to structural engineering (see description at the bottom of this web page), although perhaps i'm being too narrow-minded.
  i assume you are either a new structural engineer, an engineer of another discipline, or not an engineer at all.  if you are a new structural engineer, i suggest getting a copy of joseph e. bowles "foundation analysis and design." (mcgraw-hill) and researching mat foundations. if you're not a structural engineer, then i suggest retaining the services of one because there are a lot of issues that you may not be addressing that could cause failure of your mezzanine.
i agree with vmirat.  if you are a structural engineer, this calculation is basic.  if you are not, you don't need to be making such assessments without the local overview of an experienced engineer.
check the shear at d/2 from the face of the bearing plates.  it should be sufficient.
vmirat and ron are right on target. i like to add my voice to theirs.
math cad has a tempalte that will do what you are looking for. go to there web site and use it at your own risk. i think it is free to download.
good luck