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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.

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