m_n_kappa.crosssection.ComputationCrosssectionStrainAdd#

class m_n_kappa.crosssection.ComputationCrosssectionStrainAdd(computed_cross_section_1, computed_cross_section_2)#

Bases: ComputationCrosssectionStrain

result of adding two ComputationCrosssectionStrain-classes to each other

If the relative displacement between two cross-sections is important, these have to be looked at independent of each other. This class provides the functionality to compute this relative displacement.

Parameters:

computed_cross_section_1 (ComputationCrosssectionStrain) – 1st computed strain cross-section
computed_cross_section_2 (ComputationCrosssectionStrain) – 2nd computed strain cross-section

See also

ComputationCrosssectionStrain: computed cross-section under a constant strain_value

Examples

This example looks at a composite beam. Therefore, first the concrete-slab is created.

>>> from m_n_kappa import Concrete, Rectangle, Crosssection
>>> concrete = Concrete(f_cm=35.0)
>>> concrete_slab = Rectangle(
...     top_edge=0.0, bottom_edge=100.0, width=2000.0)
>>> concrete_section = concrete + concrete_slab
>>> concrete_cross_section = Crosssection(sections=[concrete_section])

Then a steel-beam is created.

>>> from m_n_kappa import IProfile, Steel
>>> steel = Steel(f_y=355)
>>> i_profile = IProfile(
...     top_edge=100.0, t_w=9.5, h_w=200-2*15, b_fo=200.0, t_fo=15.0)
>>> steel_cross_section = i_profile + steel

>>> from m_n_kappa.crosssection import ComputationCrosssectionStrain

Todo

finish doc-string

Methods

`add_section`(section)	add a `Section` to this cross-section
`concrete_slab_width`()	full width of the concrete slab
`decisive_maximum_negative_strain_position`()	minimum of all maximum negative strains
`decisive_maximum_positive_strain_position`()	minimum of all maximum positive strains
`get_boundary_conditions`()	curvature boundary values under positive and negative curvature
`get_sub_cross_sections`()	get cross-section split into slab- and girder-sections (the sub-cross-sections)
`girder_sections_axial_force`()	summarized axial force of the girder sections
`girder_sections_moment`()	summarized moment of the girder sections
`left_edge`()	outer left-edge of the concrete-slab
`maximum_negative_strain`()	determine maximum positive strain of all sections associated with this cross-section
`maximum_positive_strain`()	determine maximum positive strain of all sections associated with this cross-section
`right_edge`()	outer right-edge of the concrete-slab
`sections_not_of_type`(section_type)	get a list of sections that are not of the specified typ
`sections_of_type`(section_type)	get a list of sections that are of the specified type associated with this cross-section
`slab_sections_axial_force`()	summarized axial forces of the slab sections
`slab_sections_moment`()	summarized moments of the slab sections
`strain_positions`([strain_1, strain_2, ...])	get all `StrainPosition`-values between `strain_1` and `strain_2`
`total_axial_force`()	summarized axial forces of the cross_section
`total_moment`()	summarized moments of the cross_section

Attributes

`axial_force`
`bottom_edge`	overall vertical position of the bottom edge of the cross-section \(z_\mathrm{bottom}\)
`compute_sections`	`Section` in `sections` transformed into `ComputationSection`
`compute_split_sections`	split computation sections
`computed_cross_section_1`
`computed_cross_section_2`
`computed_girder_sections`	sections of the girder (computed)
`computed_slab_sections`	sections of the slab (computed)
`girder_sections`	`Section` belonging to te girder
`half_point`	vertical middle between and bottom
`height`	height of the cross-section
`section_type`	section-type this cross-section is associated with, if it is only one
`sections`	all sections associated with this cross-section
`slab_effective_width`	effective widths of the (concrete) slab
`slab_sections`	all slab-sections of this cross-section
`strain`	applied strain_value to the cross_section
`strain_difference`
`top_edge`	top-edge of the cross-section \(z_\mathrm{top}\)

add_section(section)#

add a Section to this cross-section

Parameters:: section (Section) – section to add to this cross-section
Return type:: None
Raises:: ValueError – if section is not of type Section

concrete_slab_width()#

full width of the concrete slab

Return type:: float

decisive_maximum_negative_strain_position()#

minimum of all maximum negative strains

New in version 0.2.0.

Return type:: StrainPosition

decisive_maximum_positive_strain_position()#

minimum of all maximum positive strains

New in version 0.2.0.

Return type:: StrainPosition

get_boundary_conditions()#

curvature boundary values under positive and negative curvature

Returns:: curvature boundary values under positive and negative curvature
Return type:: Boundaries