Design Codes#

The design code module allows concreteproperties to be easily used in the context of common reinforced concrete design standards. concreteproperties currently supports the following design codes:

AS 3600:2018

AS 3600:2018#

class AS3600[source]

Design code class for Australian standard AS 3600:2018.

Note that this design code only supports Concrete and SteelBar material objects. Meshed Steel material objects are not supported as this falls under the composite structures design code.

Inits the AS3600 class.

Using the AS 3600:2018 design code starts by creating an AS3600 object:

from concreteproperties.design_codes import AS3600

design_code = AS3600()

After a ConcreteSection object has been created it must be assigned to the design code:

design_code.assign_concrete_section(concrete_section=concrete_section)

AS3600.assign_concrete_section(concrete_section)[source]

Assigns a concrete section to the design code.

Parameters: concrete_section (ConcreteSection) – Concrete section object to analyse

Note

To maintain unit consistency, the cross-section dimensions should be entered in [mm].

Creating Material Properties#

The AS3600 class can be used to easily create material objects whose attributes comply with the standard.

AS3600.create_concrete_material(compressive_strength, colour='lightgrey')[source]

Returns a concrete material object to AS 3600:2018.

Material assumptions:
- Density: 2400 kg/m3
- Elastic modulus: Interpolated from Table 3.1.2
- Service stress-strain profile: Linear with no tension, compressive strength
at 0.9 * f’c
- Ultimate stress-strain profile: Rectangular stress block, parameters from
Cl. 8.1.3
- Alpha squash: From Cl. 10.6.2.2
- Flexural tensile strength: From Cl. 3.1.1.3

Parameters

compressive_strength (float) – Characteristic compressive strength of concrete at 28 days in megapascals (MPa)
colour (str, default: 'lightgrey') – Colour of the concrete for rendering

Raises

ValueError – If compressive_strength is not between 20 MPa and 100 MPa.

Returns

Concrete – Concrete material object

from concreteproperties.design_codes import AS3600

design_code = AS3600()
concrete = design_code.create_concrete_material(compressive_strength=40)

concrete.stress_strain_profile.plot_stress_strain(
  title=f"{concrete.name} - Service Profile"
)
concrete.ultimate_stress_strain_profile.plot_stress_strain(
  title=f"{concrete.name} - Ultimate Profile"
)

(Source code)

(png, hires.png, pdf)#

(png, hires.png, pdf)#

AS3600.create_steel_material(yield_strength=500, ductility_class='N', colour='grey')[source]

Returns a steel bar material object.

Material assumptions:
- Density: 7850 kg/m3
- Elastic modulus: 200,000 MPa
- Stress-strain profile: Elastic-plastic, fracture strain from Table 3.2.1

Parameters

yield_strength (float, default: 500) – Steel yield strength
ductility_class (str, default: 'N') – Steel ductility class (“N” or “L”)
colour (str, default: 'grey') – Colour of the steel for rendering

Raises

ValueError – If ductility_class is not “N” or “L”

Returns

SteelBar – Steel material object

from concreteproperties.design_codes import AS3600

design_code = AS3600()
steel = design_code.create_steel_material()

steel.stress_strain_profile.plot_stress_strain(
  title=f"{steel.name} - Stress-Strain Profile"
)

(Source code, png, hires.png, pdf)

Calculating Section Properties#

Analysis methods can be called from the AS3600 object similar to ConcreteSection object. The following methods are identical to those found in the ConcreteSection object, i.e. do not apply any capacity reduction factors:

The following methods have been modified for AS 3600:2018, with codified capacity reduction factors applied.

AS3600.ultimate_bending_capacity(theta=0, n=0, phi_0=0.6)[source]

Calculates the ultimate bending capacity with capacity factors to AS 3600:2018.

Parameters

theta (float, default: 0) – Angle (in radians) the neutral axis makes with the horizontal axis (\(-\pi \leq \theta \leq \pi\))
n (float, default: 0) – Net axial force
phi_0 (float, default: 0.6) – Compression dominant capacity reduction factor, see Table 2.2.2(d)

Returns

Tuple[UltimateBendingResults, UltimateBendingResults, float] – Factored and unfactored ultimate bending results objects, and capacity reduction factor (factored_results, unfactored_results, phi)

AS3600.moment_interaction_diagram(phi_0=0.6)[source]

Generates a moment interaction diagram with capacity factors to AS 3600:2018.

Parameters: phi_0 (float, default: 0.6) – Compression dominant capacity reduction factor, see Table 2.2.2(d)
Returns: Tuple[MomentInteractionResults, MomentInteractionResults, List[float]] – Factored and unfactored moment interaction results objects, and list of capacity reduction factors (factored_results, unfactored_results, phis)

AS3600.biaxial_bending_diagram(n=0, n_points=48, phi_0=0.6)[source]

Generates a biaxial bending with capacity factors to AS 3600:2018.

Parameters

n (float, default: 0) – Net axial force
n_points (int, default: 48) – Number of calculation points between the decompression
phi_0 (float, default: 0.6) – Compression dominant capacity reduction factor, see Table 2.2.2(d)

Returns

Tuple[BiaxialBendingResults, List[float]] – Factored biaxial bending results object and list of capacity reduction factors (factored_results, phis)