I have a structure which has a floo

[WIM32]

I have a structure which has a floor load capability of 1500 kg/m^2. On the ground, there are columns at about 4.8 meter apart. On these columns there is a floor with holes, and on this floor there are "inverted T" structures placed, they have steel strengthening and are approx. 20 cm. wide and 120 cm apart. On this "inverted T" structure I may place 1500 kg/m^2. The total area on which machinery etc. may be placed is about 20x25 m^2. I have machinery that when total mass of it is divided by the area it occupies, it exceeds the loading capability by far.
When I add up all the mass in the total area and then divide it by the total area (20x25) it is ok.
Which way is the correct way to calculate? Or are both faulty?
Thanks in advance,
Wim32

 

[Ron]

In most cases, for reinforced concrete, the design for a general area loading is sufficient to handle isolated concentrated loads. As an example, you might have a parking garage with design loadings of, say, 700 kg/m^2 yet a small truck using the garage might have a wheel load of perhaps 10 times that value.

To be safe, you should check the concentrated load condition, particularly for shear effects. If the machinery is rotating type, don't forget to include vibratory effects.