I have a slab of 20cm thickness of 20m by 4m in wich we are installing 15 tons e

I have a slab of 20cm thickness of 20m by 4m in wich we are installing 15 tons electric panels , and we have put 4 H-shaped columns under the slab but we have done many cores in the slab which seems very normal , can you help me by telling me how to calculate the bearing capacity of the slab or give me an idea if i should increase more columns
Note: load distribution area 12*1.5 m2

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