negative ground stress

In combination with negative ground stress, if the maximum positive stress value is half or less of the ground bearing force, you do not need to deal with negative stress. Also (negative stresses area/total raft area) <0.20 you don't need to bother. The values I have given are very rough values. Negative stresses should be reviewed and evaluated by the engineer. If the ground stresses due to vertical loading are not abnormally asymmetrical, you can ignore negative stress at all. If vertical loads create abnormal asymmetric stress, it is a more important issue to first make the load-bearing system of your structure symmetrically balanced and correctly arranged in terms of vertical loads.
 
Hello, I also downloaded the attached project and something else caught my eye. He solved the system without connecting the columns with beams and forming a frame. (The reason for not connecting the columns is because the ceiling of the rooms creates a bad image when you connect the columns.) Is it recommended to solve the system in this way? If not, is there a solution where we can achieve the minimum values in the dimensions of the beams to which we connect the columns? Thanks
 
system rigidity t does not give such a line before laying the foundation, but after laying the foundation, the relative floor displacement increases the system rigidity, what should I do?
 
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