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Determination of Cross-Sectional Internal Forces

Longitudinal reinforcement of a foundation is checked for the load due to bending moment and shear force. The stress in the footing bottom is assumed as linear. Stresses in individual directions x, y are determined independently.

When the linear distribution of stress in the footing bottom is considered the distribution of stress over the cross-section is provided by:

or when excluding tension:

where:

e

-

eccentricity of normal force N

d

-

width of foundation

N

-

normal force acting at the footing bottom

Bending moment and shear force are determined as reaction developed on the cantilever beam as shown in the figure:

Internal forces acting on wall jump

Internal forces in the cross-section corresponding to the constant distribution of stress are provided by:

where:

σ

-

maximal stress in the footing bottom

dv

-

length of jump

e

-

eccentricity of normal force N

d

-

width of wall foundation

N

-

normal force acting at the footing bottom

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