Design values of structural steel material properties
Nominal values of structural steel yield strength and ultimate strength
For structural design according to Eurocode 3 (EN1993-1-1), the nominal values of the yield
strength fy and the ultimate strength fu for structural
steel are obtained as a simplification from EN1993-1-1 Table
3.1, which is reproduced above in tabular format.
The provided values for fy and fu are nominal values.
For the purpose of structural design appropriate material safety factors are applicable,
such as the factors γM0, γM1,
γM2 etc. in accordance with EN1993-1-1
§6.1.
The steel classes are defined in the corresponding standards:
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EN 10025-2 Hot rolled products of structural steels. Technical delivery conditions
for non-alloy structural steels
-
EN 10025-3 Hot rolled products of structural steels. Technical delivery conditions
for normalized/normalized rolled weldable fine grain structural steels
-
EN 10025-4 Hot rolled products of structural steels. Technical delivery conditions
for thermomechanical rolled weldable fine grain structural steels
-
EN 10025-5 Hot rolled products of structural steels. Technical delivery conditions
for structural steels with improved atmospheric corrosion resistance
-
EN 10025-6 Hot rolled products of structural steels. Technical delivery conditions
for flat products of high yield strength structural steels in the quenched and
tempered condition
-
EN 10210-1 Hot finished structural hollow sections of non-alloy and fine grain
steels. Technical delivery requirements
-
EN 10219-1 Cold formed welded structural hollow sections of non-alloy and fine grain
steels. Technical delivery requirements
Unit weight and density of structural steel
The unit weight of structural steel is specified in the design standard EN 1991-1-1 Table A.4 between 77.0 kN/m3 and
78.5 kN/m3.
For structural design it is standard practice to consider the unit weight of structural
steel equal to γ = 78.5 kN/m3 and the density of structural steel
approximately ρ = 7850 kg/m3.
Modulus of elasticity of structural steel
The modulus of elasticity (Young's modulus) of structural steel is specified in the design
standard EN 1993-1-1 Section 3.2.6.
For structural design the modulus of elasticity of structural steel is considered as
E = 210000 MPa.
Design values of additional material mechanical properties for structural steel
According to EN1993-1-1 §3.2.6, the design values of
the material properties and coefficients for structural steel are:
- Modulus of elasticity (Young's modulus):
- E = 210000 MPa
- Shear modulus:
- G = E / [ 2⋅(1 + ν) ] = 80769 MPa ≈ 81000 MPa
- Poisson's ratio in elastic range:
- ν = 0.30
- Coefficient of linear thermal expansion:
- α = 12 ×10-6 °K-1
According to EN1991-1-3 §3.2.6, for calculating the
structural effects of unequal temperatures in composite concrete-steel structures to EN 1994
the coefficient of linear thermal expansion may be taken as α = 10
×10-6 °K-1, i.e. the same as the coefficient of thermal
expansion of concrete.