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Micropile
Bearing capacity of cross-section loaded by normal force
Tension normal force
In case of tension force, the stress in steel part of cross section is calculated using following formula:
| where: | σs | - | stress in steel |
| N | - | normal force acting in section | |
| As | - | area of the steel part of the micropile cross-section |
Compressive normal force
Bearing capacity of the cross-section in compression, reduced by buckling coefficient, is determined as:
| where: | χ | - | buckling coefficient |
| As | - | area of the steel part of the micropile cross-section | |
| Ac | - | area of the cement mixture part of the micropile cross-section | |
| Rsd | - | design strength of steel | |
| Rcd | - | design strength of cement mixture in compression |
Design strengths are equal to standard values in verification based on factor of safety.
Design strengths of steel and cement mixture are calculated in verification based on limit states using following formulas:
| where: | Rs | - | standard strength of steel, entered in the frame "Material" |
| γms | - | reliability coefficient of steel, entered in the frame "Settings" | |
| Rc | - | standard strength of cement mixture in compression, entered in the frame "Material" | |
| γmc | - | reliability coefficient of cement mixture, entered in the frame "Settings" |
The stress in the steel part of the cross-section is determined as:
| where: | N | - | normal force acting in section |
| Nc,u | - | bearing capacity of the cross-section in compression, reduced by influence of buckling | |
| Rsd | - | design strength of steel |
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