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Micropile
Influence of buckling
The analysis is preceded by the determination of characteristics of an ideal cross-section, in which the effect of cement mixture cross-section is transformed into steel. Slenderness of element is determined as:
| where: | lcr | - | element buckling length |
| i | - | radius of gyration of the ideal cross-section |
| where: | E | - | modulus of elasticity of the ideal cross-section |
| I | - | moment of inertia of the ideal cross-section | |
| Ncr | - | standard critical normal force, calculated in dependence on the method set in the frame "Analysis methods" |
Recounted slenderness λp is determined next:
| where: | Rsd | - | design strength of steel (in calculation based on factor of safety design strength is equal to standard strength) |
| where: | Rs | - | standard strength of steel, entered in the frame "Material" |
| γms | - | reliability coefficient of steel, entered in the frame "Settings" (limit states) |
Buckling coefficient χ is determined according to slenderness λp with the help of following formulas:
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