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 SCOPE AND APPLICATION 

1.1.1 Scope 

This Standard sets out minimum requirements for the design and construction of concrete building structures and members that contain reinforcing steel or tendons, or both. It also sets out minimum requirements for plain concrete pedestals and footings. 

 

NOTES:

1 The general principles of concrete design and construction and the criteria embodied in this Standard may be appropriate for concrete structures other than buildings, members not specifically mentioned herein and to materials outside the limits given in Clause 1.1.

2. 2 It is intended that the design of a structure or member to which this Standard applies be carried out by, or under the supervision of, a suitably experienced and competent person.

3 For guidance on the design of maritime structures refer to AS 4997. 4 If alternate materials and methods to those prescribed in this Standard are to be used, they would need to be considered as part of the development of a Performance Solution to demonstrate compliance with the relevant Performance Requirements of the National Construction Code (NCC) and be accepted by the relevant building authority. 

 

3.2.1 Introduction
The strength of a cross-section depends on the dimensions of the cross-section, the relativeconfiguration of the steel and concrete components and the material properties of the steel andconcrete, in particular the stress-strain relationships for the steel and concrete.
A well authenticated stress-strain relationship for concrete is that given by the Comite Europeen deBeton (CEB [4]). Typical stress-strain curves, for the current grades of concrete up to 50 MPa, areshown in Figure 3.2 where it should be noted that: the maximum strength of the concrete is taken as
0.85f′c to account for the effects of long term loading and other site conditions; and the strain ε0corresponding to the maximum strength of the concrete has a constant value of 0.0022 for all theconcrete strengths.

Concreate

Bar

 

For a cross-section subjected to bending and/or axial force, there are a number of assumptions that are usually made in calculating the strength of the cross-section. These are:
(a)
the resulting strain is assumed to have a linear distribution over the cross-section i.e. plane sections remain plane;
(b) the rebar is fully bonded to the concrete such that there is no slip between the concrete and the rebar;
(c) the tensile strength of the concrete is ignored;

(d) the stress in the materials within the cross-section are related to the applied strain by stress- strain relationships for the materials determined under uniaxial stress conditions as shown in Figure 3.2 and Figure 3.3; and
(e) equilibrium and strain compatibility considerations are satisfied.

 

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  • Posted on : September 28th, 2018
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