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Spread Footing
Determination of cross-sectional internal forces
Longitudinal reinforcement of a foundation is checked for the loading 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 figure:
Internal forces acting on wall jump
Internal forces in the cross-section corresponding to 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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