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GEO5

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Materials, Coefficients, Notation

The following notation for material parameters is used:

fck

-

characteristic value of cylindrical strength of concrete in compression

fcd

-

design strength of concrete in compression

fcm

-

average value of tensile strength of concrete

fctk0,05

-

lower value of the characteristic tensile strength of concrete

fctd

-

design strength of concrete in tension

fyk

-

characteristic strength of steel

fyd

-

design strength of steel in tension

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 (Tbl. 3.1).

for:

for :

Standard values of coefficients αcc, γc, αct, γs  are built-in the program - these values can also be input by the user depending on the selected National annex.

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)