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Overall Settlement and Rotation of Foundation

The foundation settlement is substantially influenced by the overall stiffness of the system represented by foundation structure and foundation soil given by:

where:

Ebasic

-

modulus of elasticity of footing

t

-

foundation thickness

Edef, av

-

weighted average of the deformation modulus up to a depth of the influence zone

l

-

footing dimension in the direction of searched stiffness

For k > 1 the foundation is assumed to be rigid and as a representative point for the determination of its settlement is assumed the characteristic point (distant by 0.37 times the foundation dimension from its axis).

For k < 1 the foundation structure is assumed to be compliant and as a representative point for the determination of foundation, the settlement is assumed the foundation center point.

The foundation rotation is determined as a difference in settlements of individual edges centers.

Rotation of spread footing - principle calculation

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