Force Method for Multiple Degrees of Indeterminacy

In the previous sections, we have looked at how to solve indeterminate systems with only one degree of indeterminacy (either internal or external determinacy). But, what happens if we have a system that has two or more degrees of indeterminacy? Such a situation is depicted in Figure 8.19. This beam is similar to the indeterminate beam studied previously in Figure 8.1, but with a fixed end at point A instead of a pin. This gives the beam an extra degree of indeterminacy, making it a 2° indeterminate system.

Figure 8.19: Force Method for Structures with Multiple Degrees of Indeterminacy