Statics › Section H · Internal forces › Topic H.2
Internal forces at a point
Weak spots such as bolt holes, welds and changes of section make engineers ask what is happening inside a beam at one particular place. This topic gives a reliable procedure for finding the normal force, shear force and bending moment at any one chosen point of a beam or frame member.
In this topic
- Why one point matters
- The procedure
- Cut the distributed load too
- Sum moments about the cut
- Worked example: a loaded floor beam
- Choosing the easier piece
- Worked example: a point on an overhang
- Worked example: a negative reaction
- Members of frames
- Common mistakes to avoid
- Key takeaways
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