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Materials, Coefficients, Notation

The following notation for material parameters is used:

fck

-

characteristic compressive strength of concrete

fcd

-

design compressive strength of concrete

fctk

-

characteristic tensile strength of concrete

fctd

-

design tensile strength of concrete

fyk

-

characteristic tensile strength of steel bar

fyd

-

design tensile strength of steel bar

fctm

-

mean tensile strength of steel bar

where:

αcc = 1

αct = 1

γc = 1.5

-

for reinforced concrete structures

γc = 1.8

-

for concrete strustures

The most common notation for geometrical parameters:

where:

b

-

cross-section width

h

-

cross-section depth

d

-

effective depth of cross-section

z

-

lever arm (arm of internal forces)

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