Statics › Section H · Internal forces › Topic H.4
The section cut method
Make the cut at a variable position x instead of a fixed point, and equilibrium gives the shear and bending moment as functions along the whole beam. Plot those functions and you have the shear and moment diagrams.
In this topic
- From a point to a function
- Loading segments
- The procedure
- Loads on a piece of length x
- Worked example: a cantilever
- Worked example: three segments
- Reading the three-segment results
- A trap: roots outside the range
- Checks before you plot
- Common mistakes to avoid
- Key takeaways
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