GeometricTransformation2D

GeometricTransformation2D(transf_type: str, d_xi: float | str = 0.0, d_yi: float | str = 0.0, d_xj: float | str = 0.0, d_yj: float | str = 0.0, description: str = '')

Bases: GeometricTransformation

Represents a 2D geometric transformation for OpenSees beam-column elements.

GeometricTransformation2D defines how 2D beam-column elements transform nodal forces and displacements between local and global coordinate systems. It supports transformation formulations (such as 'Linear', 'PDelta', or 'Corotational') and optional joint offsets at the element ends.

Tcl form

geomTransf <transf_type> <tag> [-jntOffset <d_xi> <d_yi> <d_xj> <d_yj>]

Example

from femora.core.model import Model

model = Model()
transf2d = model.transformation.transformation2d(
    transf_type="Linear",
    d_xi=0.1,
    d_yi=0.05,
    description="Linear transformation with offsets",
)
print(transf2d.tag)

Create a 2D geometric transformation.

Parameters:

Name	Type	Description	Default
`transf_type`	`str`	Type of geometric transformation (e.g., 'Linear', 'PDelta', 'Corotational').	required
`d_xi`	`float \| str`	Joint offset in the local x-direction at start node I.	`0.0`
`d_yi`	`float \| str`	Joint offset in the local y-direction at start node I.	`0.0`
`d_xj`	`float \| str`	Joint offset in the local x-direction at end node J.	`0.0`
`d_yj`	`float \| str`	Joint offset in the local y-direction at end node J.	`0.0`
`description`	`str`	Optional description for the transformation.	`''`

Methods:

has_joint_offsets

has_joint_offsets() -> bool

Check if the transformation has non-zero joint offsets.

Returns:

Type	Description
`bool`	True if any joint offset exceeds `self.eps` in absolute magnitude,
`bool`	False otherwise.