Materials, Coefficients, Notation
The following notation for material parameters is used:
fck | - | characteristic value of cylindrical compressive strength of concrete |
fcd | - | design compressive strength of concrete |
fcm | - | average value of compressive strength of concrete |
fctm | average value of tensile strength of concrete | |
fctk0,05 | - | lower value of the 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 |
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).
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| for: fck ≤ 50 MPa |
| for: fck > 50 MPa |
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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) |