double_lift_core_b

sectionproperties.pre.library.concrete_sections.double_lift_core_b(d: float, b: float, t1: float, t2: float, t3: float, a: float, dia_bar: float, area_bar: float, spacing: float, cover: float, double: bool = True, n_circle: int = 4, conc_mat: Material = Material(name='default', elastic_modulus=1, poissons_ratio=0, yield_strength=1, density=1, color='w'), steel_mat: Material = Material(name='default', elastic_modulus=1, poissons_ratio=0, yield_strength=1, density=1, color='w')) → CompoundGeometry[source]

Constructs a reinforced concrete double lift core (type B) section.

Constructs a reinforced concrete double lift core (type B) section of depth d, width b, top/bottom thickness t1, left/right thickness t2, central wall thickness t3 and door opening width a. The wall reinforcement has a maximum spacing of spacing and is doubly reinforced if double is set to True, or singly reinforced if it is set to False.

Type B refers to the fact that there is a central wall dividing the two lift cores.

Note

As the reinforcing bars are described by discretised circles, the area of each bar is required to ensure that the correct reinforcing area is provided.

Parameters:

  • d (float) – Concrete wall depth

  • b (float) – Concrete wall width

  • t1 (float) – Top/bottom concrete wall thickness

  • t2 (float) – Left/right concrete wall thickness

  • t3 (float) – Central concrete wall thickness

  • a (float) – Door opening width

  • dia_bar (float) – Diameter of the reinforcing bars, used for calculating bar placement

  • area_bar (float) – Area of the reinforcing bars

  • spacing (float) – Maximum spacing of the reinforcement bars, the calculated spacing is equal to ceil(extent / spacing) + 1

  • cover (float) – Clear cover to the reinforcing bars

  • double (bool) – If set to True, provides two layers of reinforcement to the wall. If set to False, provides a single central layer of reinforcement to the wall. Defaults to True.

  • n_circle (int) – Number of points used to discretise the circular reinforcing bars. Defaults to 4.

  • conc_mat (Material) – Material object to assign to the concrete area. Defaults to pre.DEFAULT_MATERIAL.

  • steel_mat (Material) – Material object to assign to the steel area. Defaults to pre.DEFAULT_MATERIAL.

Raises:

  • ValueError – Geometry generation failed

  • ValueError – If the lift door opening geometry is invalid

Returns:

Reinforced concrete double lift core (type B) section geometry

Return type:

CompoundGeometry

Example

The following example creates a 6000 mm deep x 3000 mm wide double lift core (type B) concrete section, with top/bottom walls 250 mm thick, left/right walls 220 mm thick, central wall 180 mm thick and a door opening of 1500 mm. The wall is reinforced with a single layer of N24-300 with 50 mm cover. A coarse finite element mesh is generated to show the different material regions:

from sectionproperties.pre import Material
from sectionproperties.pre.library import double_lift_core_b
from sectionproperties.analysis import Section

concrete = Material(
    name="Concrete",
    elastic_modulus=30.1e3,
    poissons_ratio=0.2,
    yield_strength=32,
    density=2.4e-6,
    color="lightgrey",
)
steel = Material(
    name="Steel",
    elastic_modulus=200e3,
    poissons_ratio=0.3,
    yield_strength=500,
    density=7.85e-6,
    color="grey",
)

geom = double_lift_core_b(
    d=6000,
    b=3000,
    t1=250,
    t2=220,
    t3=180,
    a=1500,
    dia_bar=24,
    area_bar=450,
    spacing=300,
    cover=50,
    double=True,
    n_circle=12,
    conc_mat=concrete,
    steel_mat=steel,
)

geom.create_mesh(mesh_sizes=[0])  # a size of zero creates a coarse mesh
Section(geometry=geom).plot_mesh()

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

../_images/sectionproperties-pre-library-concrete_sections-double_lift_core_b-1.png

Reinforced concrete double lift core (type B) section geometry