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 |
fctm | average value of tensile strength of concrete | |
fctd | - | design axial tensile strength of concrete |
fyk | - | characteristic tension strength of steel bar |
fyd | - | design tension 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 (Ch. 8.2).
for fck ≤ 50 MPa
for fck > 50 MPa
for fck ≤ 50 MPa
for fck > 50 MPa
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) |