| Matrix or Vector | Geometry | Shape Functions | Integration Points |
|---|---|---|---|
| Stiffness and Stress Stiffness Matrices; and Thermal Load Vector | Quad | Equation 11–137 and Equation 11–138 | 2 x 2 |
| Triangle | Equation 11–114 and Equation 11–115 | 3 | |
| Mass Matrix | Quad | Same as stiffness matrix | 3 x 3 |
| Triangle | 3 | ||
| Pressure Load Vector | Same as stiffness matrix, specialized to the face | 2 along face | |
| Load Type | Distribution |
|---|---|
| Element Temperature | Same as shape functions across element, constant thru thickness or around circumference |
| Nodal Temperature | Same as element temperature distribution |
| Pressure | Linear along each face |
Reference: Zienkiewicz([40])
Structures describes the derivation of structural element matrices and load vectors as well as stress evaluations. General Element Formulations gives the general element formulations used by this element.