How to solve the single footing issue ?

[ammer]

Dear hakan,
have a good day
while analysis the attached building having single foundation, and the allowable bearing stress for soil was 100 kn/m2,
i got the negative stress and didn't check for bearing soil...Even if it did not check positive less than the allowable.

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[Hakan Şahin]

Hi Ammer,

You may define single footing as symmetrical. Non symmetrical single footing's eccentricity causes negative soil stresses.

See sample project that I enclosed to topic.

 

[ammer]

thanks hakan to this clarification,
but in my case i can not do it because of the boundary are limit and not allowed to out extension,and may be solve by mat foundation,but i want to see how idecad deal with negative stress.
thanks again