How do I simulate a roof rafter?

Open this page and use the live Shear & Moment tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a roof rafter from your own measurements.

Use case · powered by Shear & Moment

Shear & Moment for a roof rafter

Simulate a roof rafter live in your browser. This runs the real Shear & Moment solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

For:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students First Responders

Shear & Moment DiagramsLive

simply-supported beam

Controls

Presets

Span L (m)

Point load P (kN)

Load position a (m)

Uniform load w (kN/m)

Shear and bending-moment diagrams show the internal forces along a beam. Shear jumps at each point load; the moment is the running integral of shear and peaks where shear crosses zero. Engineers size beams for this maximum moment. Educational tool, not a substitute for structural design.

▶ Run in Python

Data Inspector

Reaction A28.3 kN

Reaction B21.7 kN

Max moment46.6 kN·m

at x2.01 m

Governing equation

\frac{d V}{d x} = - w = - 5, \frac{d M}{d x} = V, M_{m a x} = 46.6 kN\cdotm

Reading this result: Combined loading: reactions RA=28.3 and RB=21.7 kN, and the maximum moment 46.6 kN·m lands at x=2.0 m where shear crosses zero.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

About this simulation

The full Shear & Moment tool models a roof rafter with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Shear & Moment

Shear & Moment for a cantilever balcony Shear & Moment for a bridge girder Shear & Moment for a floor joist Shear & Moment for a steel beam Shear & Moment for a timber deck Shear & Moment for a crane boom Shear & Moment for a retaining wall Shear & Moment for a stair stringer

Other ways to simulate a roof rafter

2D Fluid (CFD) for a roof rafter 3D CFD for a roof rafter 3D FEA Space Frame for a roof rafter FEA Truss for a roof rafter Meshing + BCs for a roof rafter RLC Circuit for a roof rafter

Frequently asked questions

How do I simulate a roof rafter?: Open this page and use the live Shear & Moment tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a roof rafter from your own measurements.