Method of sections and graphical truss analysis for fast member force solutions

What this note covers

1. Choose a cut that isolates the force you need
2. Support reactions come from the whole truss
3. Solve a chord force using a strategic moment centre
4. Signs describe assumptions, not different kinds of answer
5. Graphical analysis is a scaled equilibrium construction
6. Build a section solution a marker can follow
7. Worked method of sections: isolate a chord force with one moment equation
8. Worked graphical audit: scale error versus equilibrium error

8 sections · 10 key terms & formulas · 6 common mistakes