Clause 3.2 Properties of Reinforcement

3.2.1 Strength and Ductility

For the purposes of design, the characteristic yield strength of reinforcement (fsy ) shall be taken as not greater than the value specified in Table 3.2.1 for the appropriate type of reinforcement (see also Clause 17.2.1.1).

The ductility of the reinforcement shall be characterized by its uniform strain (εsu) and tensile-to-yield stress ratio and designated as low (L) or normal (N) Ductility Class as given in Table 3.2.1. For the purposes of design, values of these parameters for each Ductility Class shall comply with AS/NZS 4671.

NOTE: In AS/NZS4671, εsu is referred to as Agt, expressed as a percentage, and fsy is referred to as Re.

3.2.2 Modulus of Elasticity

The modulus of elasticity of reinforcement (Es) for all stress values not greater than the yield strength (fsy) shall be either:

(a) taken as equal to 200 x 10³ MPa; or
(b) determined by test.

3.2.3 Stress-Strain Curves

A stress-strain curve for reinforcement shall be either:

(a) assumed to be of a form defined by recognised simplified equations; or
(b) determined from suitable test data.

3.2.4 Coefficient of Thermal Expansion

The coefficient of thermal expansion of reinforcement may be either:

(a) taken as equal to 12 x 10^-6/ºC; or
(b) determined from suitable test data.