which footing is better for such condition? 2

[curiousinvite]

Redline is boundary line ,footing cannot exceed beyound boundary line ,which footing would be most economical for such condition ?

 

[EireChch]

Many footings have constraints like that but a concrete slab with thickened perimeter will work, or a sufficiently wide perimeter beam on its own with slab above.

 

[HTURKAK]

You may consider inverted bowl foundation or grid foundation depending on the geotechnics , no. of storeys, frost depth etc..

 

[SlideRuleEra]

...which footing would be most economical for such condition ?

Depends on the loads. If loads are "light", I agree with others.

If loads are "heavy", probably a mat foundation (which will use more concrete, but avoid excessive expensive labor to form a complex grid).

http://www.SlideRuleEra.net

 

[dik]

Spans seem awfully short; if loads are not too bad, then a stiffened edge slab with stiffeners at the interior column locations (and possibly exterior column locations).

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik