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Create a Custom Circular Cross-section¶

This example demonstrates how to create a custom circular reinforced concrete cross-section with more advanced reinforcement configurations using the blueprints library.

We'll build upon the basic circular cross-section by adding custom reinforcement patterns, including diagonal reinforcement lines and center rebars.

Let's start building our custom design!

Import Required Libraries¶

First, let's import the necessary modules, including some additional ones for custom configurations:

In [1]:

"""Custom reinforced concrete cross-section example."""

from shapely import LineString

from blueprints.materials.concrete import ConcreteMaterial, ConcreteStrengthClass
from blueprints.materials.reinforcement_steel import ReinforcementSteelMaterial, ReinforcementSteelQuality
from blueprints.structural_sections.concrete.rebar import Rebar
from blueprints.structural_sections.concrete.reinforced_concrete_sections.circular import CircularReinforcedCrossSection, ReinforcementByQuantity

"""Custom reinforced concrete cross-section example.""" from shapely import LineString from blueprints.materials.concrete import ConcreteMaterial, ConcreteStrengthClass from blueprints.materials.reinforcement_steel import ReinforcementSteelMaterial, ReinforcementSteelQuality from blueprints.structural_sections.concrete.rebar import Rebar from blueprints.structural_sections.concrete.reinforced_concrete_sections.circular import CircularReinforcedCrossSection, ReinforcementByQuantity

Define Materials¶

Next, we'll define the concrete and reinforcement steel materials:

In [2]:

# Define a concrete material
concrete = ConcreteMaterial(concrete_class=ConcreteStrengthClass.C35_45)

# Define a reinforcement steel material
steel = ReinforcementSteelMaterial(steel_quality=ReinforcementSteelQuality.B500B)

# Define a concrete material concrete = ConcreteMaterial(concrete_class=ConcreteStrengthClass.C35_45) # Define a reinforcement steel material steel = ReinforcementSteelMaterial(steel_quality=ReinforcementSteelQuality.B500B)

Create the Basic Cross-section¶

Let's start with the same circular cross-section as in the basic example:

In [3]:

# Define a circular reinforced cross-section
cs = CircularReinforcedCrossSection(
    diameter=400,
    cover=35,
    concrete_material=concrete,
)

# Define a circular reinforced cross-section cs = CircularReinforcedCrossSection( diameter=400, cover=35, concrete_material=concrete, )

Add Standard Longitudinal Reinforcement¶

First, let's add the standard perimeter reinforcement:

In [4]:

# Add longitudinal reinforcement to the cross-section
cs.add_longitudinal_reinforcement_by_quantity(
    n=5,
    diameter=25,
    material=steel,
)

# Add additional longitudinal reinforcement to the cross-section
cs.add_longitudinal_reinforcement_by_quantity(
    n=5,
    diameter=16,
    material=steel,
    start_angle=45,
)

# Add longitudinal reinforcement to the cross-section cs.add_longitudinal_reinforcement_by_quantity( n=5, diameter=25, material=steel, ) # Add additional longitudinal reinforcement to the cross-section cs.add_longitudinal_reinforcement_by_quantity( n=5, diameter=16, material=steel, start_angle=45, )

Add Stirrups¶

Add stirrups around the perimeter:

In [5]:

# Add stirrups to the cross-section
cs.add_stirrup_along_perimeter(
    diameter=10,
    distance=150,
    material=steel,
)

# Add stirrups to the cross-section cs.add_stirrup_along_perimeter( diameter=10, distance=150, material=steel, )

Out[5]:

Stirrup (id=1)|⌀10/B500B

Add Custom Diagonal Reinforcement¶

Now for the custom part - let's add reinforcement along a diagonal line using Shapely geometry:

In [6]:

# Add reinforcement configuration to the cross-section in a diagonal line
linestring = LineString([(-100, 100), (100, 0)])
cs.add_reinforcement_configuration(
    line=linestring,
    configuration=ReinforcementByQuantity(
        diameter=12,
        n=7,
        material=steel,
    ),
)

# Add reinforcement configuration to the cross-section in a diagonal line linestring = LineString([(-100, 100), (100, 0)]) cs.add_reinforcement_configuration( line=linestring, configuration=ReinforcementByQuantity( diameter=12, n=7, material=steel, ), )

Add Center Rebar¶

Finally, let's add a single rebar at the center of the cross-section:

In [7]:

# Add longitudinal rebar in center
cs.add_longitudinal_rebar(rebar=Rebar(diameter=16, x=0, y=0, material=steel))

# Add longitudinal rebar in center cs.add_longitudinal_rebar(rebar=Rebar(diameter=16, x=0, y=0, material=steel))

Out[7]:

Rebar(horizontal_offset=0.0, vertical_offset=0.0, rotation=0.0, diameter=16, x=0, y=0, name='Rebar', material=ReinforcementSteelMaterial(steel_quality=<ReinforcementSteelQuality.B500B: 'B500B'>, density=7850.0, reinforcement_type=<ReinforcementType.BARS: 'Bars'>, bar_surface=<ReinforcementBarSurface.RIBBED: 'Ribbed'>, steel_fabrication=<SteelFabrication.HOT_ROLLED: 'Hot-rolled'>, diagram_type=<ReinforcementDiagramType.BILINEAR_NOT_INCLINED: 'Bi-linear with horizontal branch'>, material_factor=1.15, custom_name=None, custom_e_s=None), relative_start_position=0.0, relative_end_position=1.0)

Review Our Custom Design¶

At this point, our custom cross-section includes:

• ✅ A 400mm diameter circular concrete cross-section with 35mm cover
• ✅ 5 longitudinal reinforcement bars (25mm diameter) around the perimeter
• ✅ 5 additional reinforcement bars (16mm diameter, offset by 45°)
• ✅ Stirrups (10mm diameter, spaced at 150mm intervals)
• ✅ Custom diagonal reinforcement (7 bars of 12mm diameter along a diagonal line)
• ✅ Center rebar (16mm diameter at the center)

Now let's see our complete custom reinforced concrete cross-section!

Visualize Our Cross-section¶

Let's plot the cross-section to see our custom design with all the additional reinforcement:

In [8]:

# Plot the cross-section
import matplotlib.pyplot as plt

fig = cs.plot(show=False)  # Create the plot but don't show it yet
plt.show()

# Plot the cross-section import matplotlib.pyplot as plt fig = cs.plot(show=False) # Create the plot but don't show it yet plt.show()

Summary¶

This example demonstrated advanced customization capabilities:

1. Basic Setup: Import modules and define materials
2. Standard Reinforcement: Create circular cross-section with perimeter rebars and stirrups
3. Custom Geometry: Use Shapely LineString to define diagonal reinforcement paths
4. Advanced Configuration: Add reinforcement along custom geometric lines
5. Precise Placement: Add individual rebars at specific coordinates
6. Visualization: Display the complete custom design

The blueprints library provides flexibility to create any custom reinforcement pattern you need, combining standard methods with geometric precision for complex designs!