What’s on the Determinacy poster
The rule, 3 worked examples, and the mistake everyone makes.
- A structure is statically determinate when equilibrium alone yields every reaction an…
- Plane frame: 3m + r − 3j − c · Plane truss: m + r − 2j
- Count comes to zero = Determinate
- Count is positive = Indeterminate
- Count is negative = A mechanism
- Common mistake: Trusting the count on its own → Check the geometry as well
Educational reference. Indeterminate structures are stiffer and carry redundancy, but need stiffness or force methods.
Questions about the Determinacy poster
- What’s on the Determinacy poster?
- The rule, 3 worked examples, and the mistake everyone makes. A structure is statically determinate when equilibrium alone yields every reaction an…; Plane frame: 3m + r − 3j − c · Plane truss: m + r − 2j; Count comes to zero = Determinate; Count is positive = Indeterminate; Count is negative = A mechanism; Common mistake: Trusting the count on its own → Check the geometry as well. Educational reference. Indeterminate structures are stiffer and carry redundancy, but need stiffness or force methods.
- Who is the Determinacy poster for?
- Determinacy belongs to the Civil Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning structural analysis can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Determinacy poster?
- Do the count before choosing a method. It tells you which method exists. A wall chart earns its place by being glanceable from where the work is happening, so Determinacy belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
- What other posters go with Determinacy?
- Braced vs Moment Frame, Beam Reactions and Bending Stress sit alongside Determinacy in the Civil Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Braced vs Moment FrameBeam ReactionsBending Stress
- Is the Determinacy poster free to download and print?
- Yes. Determinacy downloads as a free PDF with no account, no email and no watermark, like everything else in the Civil Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Determinacy poster print at?
- Determinacy is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Determinacy loses nothing.Printing guide
Related posters
Charts that sit alongside Determinacy on the same wall.
Browse every Civil Engineering poster, or start from the full catalogue.