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 |