Materials, coefficients, notation
The following notation for material parameters is used:
fck | - | characteristic cube compressive strength of concrete |
fcd | - | design compressive strength of concrete |
fctk | - | characteristic tensile strength of concrete |
fctd | - | design tensile strength of concrete |
fy | - | characteristic strength of steel bar |
fyd | - | design tensile strength of steel bar |
The characteristic compressive strength of concrete is the basic input parameter given by the class of concrete - it serves to derive the remaining coefficients of reliability.
The most common notation for geometrical parameters:
b | - | cross-section width |
h | - | cross-section depth |
d | - | effective depth of cross-section |
z | - | lever arm (arm of internal forces) |
All computations are carried out according to the theory of limit states.