simdesign.rcmrf.bdim.eu_cdn.beam

This module provides the beam class implementation for the eu_cdn design class in the BDIM layer.

simdesign.rcmrf.bdim.eu_cdn.beam.ECONOMIC_MU_EB: float = 0.25

Maximum mu value considered for the economic emergent beam design.

simdesign.rcmrf.bdim.eu_cdn.beam.ECONOMIC_MU_WB: float = 0.25

Maximum mu value considered for the economic wide beam design.

simdesign.rcmrf.bdim.eu_cdn.beam.TAU_C = 400.0

Allowable shear stress carried by the concrete or the design shear strength of concrete. Specified in the Article 23 of RBA (1935).

simdesign.rcmrf.bdim.eu_cdn.beam.TAU_MAX = 1400.0

Allowable shear stress carried by the beam section. Specified in the Article 23 of RBA (1935).

simdesign.rcmrf.bdim.eu_cdn.beam.MODULAR_RATIO = 15

Assumed steel to concrete elastic modular ratio for reinforcement computation.

class simdesign.rcmrf.bdim.eu_cdn.beam.Beam(line, typology, gamma_rc)[source]

Bases: BeamBase

Beam implementation for design class eu_cdn.

This class extends BeamBase by narrowing the attribute types and overriding design methods per RBA (1935).

Variables:

  • steel (Steel) – Steel material assigned to the beam.

  • concrete (Concrete) – Concrete material assigned to the beam.

Parameters:

  • line (Line)

  • typology (Literal[1, 2])

  • gamma_rc (float)

See also

BeamBase

Base class defining the core behaviour and configuration.

References

RBA (1935) Regulamento do Betão Armado. Decreto N.° 25:948, Lisbon, Portugal.

steel: Steel
concrete: Concrete
predesign_section_dimensions(slab_h)[source]

Make an initial guess for beam section dimensions.

Parameters:

slab_h (float) – Slab thickness.

Return type:

None

Notes

This method overrides BeamBase.predesign_section_dimensions with the following changes:

  • Uses a single expression for computing the height to control emergent beam deformations under gravity loads, assuming d' = 0.1h for the cover depth.

verify_section_adequacy()[source]

Verify the beam section dimensions for design forces.

Notes

Based on Article 23 of RBA (1935).

Return type:

None

compute_required_longitudinal_reinforcement()[source]

Compute the required longitudinal reinforcement for design forces.

Notes

  • Top reinforcement is calculated as the maximum of required reinforcement in tension for maximum of negative bending moments and required reinforcement in compression for maximum of positive bending moments.

  • Bottom reinforcement is calculated as the maximum of required reinforcement in compression for maximum of negative bending moments and required reinforcement in tension for maximum of positive bending moments.

  • For doubly reinforced beams, the balanced moment capacity is used to split the moment into a singly reinforced contribution and an excess moment resisted by the compression reinforcement.

  • Required reinforcement is computed at three different sections: start, middle, end.

References

https://mathalino.com/reviewer/reinforced-concrete-design/design-steel-reinforcement-concrete-beams-wsd-method

Return type:

None

compute_required_transverse_reinforcement()[source]

Compute the required transverse reinforcement for design forces.

Notes

  • Reinforcement is computed at three sections: start, mid, and end.

  • The shear threshold Vrd = TAU_C * b * d is derived from Article 23 of RBA (1935), which defines TAU_C as the stress level above which transverse reinforcement becomes mandatory.

Return type:

None