sajou.elements.spring2d module

Defines a 2-dimensional spring element

class sajou.elements.spring2d.Spring2D(node1, node2, number)

Bases: sajou.elements.element.Element

Defines a 2D spring element and all its methods

Parameters:

• node1 (Node instance) – first node
• node2 (Node instance) – second node
• number (int) – number of the element

node1

Node instance – first node

node2

Node instance – second node

efs

dict – Element freedom signature. Defines the degree of freedom active (dof) in each node.

nefmt

dict – Node freedom map table of the element.

n_active_dof

int – number of active dof

transformation_matrix

ndarray – transformation matrix for the element, from local to global

assemble_Ke()

Assemble the element stiffness matrix ‘Ke’ in local and global coordinates.

Returns:local stiffness matrix

assign_elastic_constant(elastic_K)

Assigns the elastic constant to the spring element.

Parameters:elastic_K (float) – The elastic constant of the spring