Footing Loss of Contact

[EngrJS1]

Hello,

I am designing a combined footing. With that, what are the possible scenarios which might cause the footing to lose contact on the soil?

 

[EireChch]

Eccentric loading results in a footing that may have a negative bearing pressure. This is in theory, in reality the footing doesnt lift off the soil

 

[HTURKAK]

If uplift forces develop at the columns and the wt of ftg and overburden is less than total uplift force, then the ftg can lose contact.In case of oOnly moment , some portion of the ftg may subject to uplift as Mr . EireChch (Geotechnical) stated.

 

[SlideRuleEra]

Erosion of soil from under the footing. This happens, I've had to deal with it.