ospgrid.grid.Member#

class Member(idx, node_i, node_j, EI, GJ)[source]#

Bases: object

Object encapsulating the proeprties for a grid member

Initialize the member object

Parameters

idx (int) – The member index in the grid.
node_i (Node) – The start node of the member.
node_j (Node) – The end node of the member.
EI (float) – The flexural rigitidy.
GJ (float) – The torsional rigidity.

Return type

None.

Methods

`get_global_stiffness`	Returns the member stiffness matrix in global coordinates with nodal DOFs in the order DZ ('vertical' force), RX (torsion), RZ (bending moment).
`get_local_stiffness`	Returns the member stiffness matrix in local coordinates with nodal DOFs in the order DZ ('vertical' force), RX (torsion), RZ (bending moment).
`get_transformation_matrix`	Gives the transformation matrix relating the member dgrees of freedom from local to global coordinate system.

get_local_stiffness()[source]#

Returns the member stiffness matrix in local coordinates with nodal DOFs in the order DZ (‘vertical’ force), RX (torsion), RZ (bending moment).

Returns: K – Member stiffness matrix in local coordinates.
Return type: np.ndarray

get_transformation_matrix()[source]#

Gives the transformation matrix relating the member dgrees of freedom from local to global coordinate system.

It considers only the grid member DOFs, per get_local_stiffness()

Returns: T – Tranformation matrix
Return type: np.ndarray

get_global_stiffness()[source]#

Returns the member stiffness matrix in global coordinates with nodal DOFs in the order DZ (‘vertical’ force), RX (torsion), RZ (bending moment). This shows the stiffness contributions of the member to the global DOFs.

Returns: Kg – Member stiffness matrix in global coordinates.
Return type: np.ndarray