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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 "Micropiles" tab

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"

γss

-

reliability coefficient of steel, entered in the "Micropiles" tab (limit states)

Buckling coefficient χ is determined according to slenderness λp with the help of following formulas:

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