10-13-2010, 08:38 PM
king12 wrote:-
...This is a simple cantilever slab design sheet based on IS code. Kindly review and suggest....
Comment:-
Your slab is too shallow for a cantilever slab of the span that you specified. Use span/effective depth ratio = 7. This implies that effective depth = span/7. Since the span = 1.75m (=1750mm), then effective depth = 1750/7=250mm. If you are to have a clear cover of 20mm and you are using 12mm diameter steel, then the overall depth of your slab should not be less than 250+20+12=282mm (say 280mm at worse).
Again, I think that the loading of 2.56kN/m^2 for the floor finishing is too much. It should be about 1kN/m^2. The miscellaneous load should also not be more than 1.5KN/M^2. Try not to over load your structure as this could lead to over design and indicate the wrong forces and stresses at the wrong places. You did not indicate on how you arrived at your design moment of 34.3kNm (it would be helpful to indicate that). As to the other parts of your design, I did not take a look at them as I felt that that is easy enough as not to warrant any comments.
Regards
Teddy
...This is a simple cantilever slab design sheet based on IS code. Kindly review and suggest....
Comment:-
Your slab is too shallow for a cantilever slab of the span that you specified. Use span/effective depth ratio = 7. This implies that effective depth = span/7. Since the span = 1.75m (=1750mm), then effective depth = 1750/7=250mm. If you are to have a clear cover of 20mm and you are using 12mm diameter steel, then the overall depth of your slab should not be less than 250+20+12=282mm (say 280mm at worse).
Again, I think that the loading of 2.56kN/m^2 for the floor finishing is too much. It should be about 1kN/m^2. The miscellaneous load should also not be more than 1.5KN/M^2. Try not to over load your structure as this could lead to over design and indicate the wrong forces and stresses at the wrong places. You did not indicate on how you arrived at your design moment of 34.3kNm (it would be helpful to indicate that). As to the other parts of your design, I did not take a look at them as I felt that that is easy enough as not to warrant any comments.
Regards
Teddy