Verification Based on Limit States
The program performs verification analysis of the micropile tube and root:
Verification of the cross section (tube)
Both, internal stability of section and coupled section bearing capacity, are verified.
1. Internal stability of section
where: | Nmax | - | maximal normal force, entered in the frame "Load" |
Ncrd | - | design critical normal force |
where: | Ncr | - | standard critical normal force, calculated in dependence on the method set in the "Micropiles" tab |
γmf | - | reduction coefficient of critical force, entered in the "Micropiles" tab (limit states) |
2. Coupled section bearing capacity
where: | σs | - | stress in steel, calculated according to the way of load (section loaded only by normal force or by combination of bending moment and normal force) |
Rsd | - | design strength of steel |
where: | Rs | - | standard strength of steel, entered in the frame "Material" |
γss | - | reliability coefficient of steel, entered in the "Micropiles" tab (limit states) |
Verification of the root
where: | Nmax | - | maximal normal force, entered in the frame "Load" |
Qrd | - | design root bearing capacity |
where: | Q | - | standard root bearing capacity, calculated in dependence on used method (see "Bearing capacity of the micropile root section") |
γr | - | reduction coefficient of root resistance, entered in the "Micropiles" tab (limit states) |