The following video shows how to obtain the numerical solution in which the Ansys solver will form the stiffness matrix for each element, assemble the global stiffness matrix and invert it to get the nodal displacements.
Summary of steps in the above video:
In Ansys Mechanical, highlight Solution in Outline Tree. Click Solve.
To see what element type the Ansys solver used:
Highlight Solution Information in Outline Tree.
Click anywhere under Solver Output.
Press Ctrl+F. In the search box, type: element type. You can see that the element type used is PLANE182.
To see more information on PLANE182
Select Help > Mechanical Help.
Click on the Search tab. In the search box, type: plane182.
PLANE182 should appear in the list of pages found. If you click on the page, information will appear in the window to the right.