SSPQuad

A Stabilized Single-Point (SSP) quadrilateral element for 2D analysis with enhanced stability.

Parameters:

Parameter	Description	Type
Type	Type of element, either “PlaneStrain” or “PlaneStress”	string
Thickness	Thickness of the element in out-of-plane direction	float
b1	Constant body forces in global x direction	float
b2	Constant body forces in global y direction	float

Material Compatibility: - Compatible with 2D (nDMaterial) type materials

Degrees of Freedom: - 2 DOFs per node

Example

# Direct creation
from femora.components.Element.elementsOpenSees import SSPQuadElement
from femora.components.Material.materialsOpenSees import ElasticIsotropicMaterial

# Create a material first
material = ElasticIsotropicMaterial(user_name="Steel", E=200e9, nu=0.3, rho=7850)

# Create the element
quad_element = SSPQuadElement(
    ndof=2,
    material=material,
    Type="PlaneStress",
    Thickness=0.1,
    b1=0.0,
    b2=-9.81  # Gravity in y-direction
)

# Via Femora
import femora as fm


# Create material
steel = fm.material.create_material(
    material_category="nDMaterial",
    material_type="ElasticIsotropic",
    user_name="Steel",
    E=200e9,
    nu=0.3,
    rho=7850
)

# Create element
quad = fm.element.create_element(
    element_type="SSPQuad",
    ndof=2,
    material="Steel",
    Type="PlaneStress",
    Thickness=0.1,
    b1=0.0,
    b2=-9.81
)