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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 the verification based on the factor of safety.

Design strengths of steel and cement mixture are calculated in the verification based on the theory of limit states as follows:

where:

Rs

-

standard strength of steel, entered in the frame "Material"

γss

-

reduction coefficient of steel strength, entered in the "Micropiles" tab

Rc

-

standard strength of cement mixture in compression, entered in the frame "Material"

γsc

-

reduction coefficient for cement mixture, entered in the "Micropiles" tab

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