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## Homework Statement

Combine five element matrices into single matrix forming a global stiffness matrix for simple truss analysis (five elements, four nodes).

## Homework Equations

-See attached image-

## The Attempt at a Solution

Where the four sub-matrices overlap in the global matrix two or three values/numbers occupy the same position in the global matrix (two separate values for AA, three separate values for BB, and so on). Should I simply add these values to form a single value for the global matrix? For example: if AA1 = -10, and AA2 = +5 should I simply combine them as AA = -10+5 = -5?

Is it really as simple as that?

Thanks.