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Concrete Reinforcing SD Steel
Technical Characteristics
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Description
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Technical Characteristics
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DUCTILITY
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Constantly increasing requirements for earthquake-resistant constructions demand the use of high ductility steels. This led European Authorities and European Commissions for Standardization to propose steels which are characterized not only by their strength but also by their high ductility. Reinforcing steel within the framework of the EN 10080 has been adopted by all the committees charged with forming the new European national standards.

The ductility of steel (its ability to absorb deformation energy) is the most critical requirement affecting the ability of a reinforced concrete construction to develop plasticity. On the stress-strain diagram (σ-ε) obtained from the tensile test, the plastic energy absorbed by steel is represented by the area covered by the shaded part of the diagram.

Increasing ductility means maximizing this area, which is achieved through high values for Strain (elongation) (εu) and Tensile Strength/Yield Strength ratio (ft/fy).

In current standards, ductility is defined by a series of parameters such as:
  • Elongation at Maximum Load (Agt)

  • The ratio between the Ultimate Tensile Strength of the steel and its Yield Strength (ft/fy)

  • The ratio between the actual and the nominal Yield Strengths (fy act/fy nom)
The following table lists the mechanical properties of SD Reinforcing Steel in terms of the most important current standards and regulations on steels.

(The requirements of the standards are stated in typical values)

Mechanical Characteristics of SD Steel
Mechanical Characteristics
BDS 4758
DIN 488(BSt500s)
SIDENOR SD
fy(N/mm²)
>=412/390
>=500
>=500
ft(N/mm²)
>=590
>=550
>=550
A (%)
14 (A5d)
>=10% (A10d)
>=10% (A10d) &
>=12% (A5d)
ft/fy
-
>=1,05
>=1,08

SD Reinforcing Steel exceeds the current strength and ductility requirements of even the most demanding standards and regulations.
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