How do I simulate a roof rafter?

Open this page and use the live Excavation & Shoring 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.

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Excavation & Shoring for a roof rafter

Simulate a roof rafter live in your browser. This runs the real Excavation & Shoring 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

Retaining Wall

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Retaining Wall (Rankine)Live

earth pressure & stability

Controls

Presets

Wall height H (m)

Soil friction angle φ (°)

Soil unit weight γ (kN/m³)

Base width (m)

Rankine theory gives the active earth pressure behind a wall from the coefficient Ka = tan²(45−φ/2). The soil pushes with a triangular pressure resultant Pa acting at one-third the height. The wall must resist overturning and sliding with adequate factors of safety. Educational tool, not a geotechnical design.

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Data Inspector

Ka0.333

Active thrust Pa48.0 kN/m

FS overturning1.82

FS sliding0.81

Governing equation

K_{a} = tan^{2} (45 - \frac{φ}{2}) = 0.333, P_{a} = \frac{1}{2} K_{a} γ H^{2} = 48.0 kN/m

Reading this result: Sliding FS is 0.81, under the ~1.5 target — the wall could slide out. A wider base or a shear key would help.

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

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Groundwater

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Groundwater Well DrawdownLive

Thiem steady-state cone of depression

Controls

Presets

Pumping rate Q (m³/day)

Transmissivity T (m²/day)

Radius of influence R (m)

Pumping a well lowers the water table into a cone of depression. Under the Thiem steady-state solution the drawdown is s(r) = Q/(2πT)·ln(R/r): more pumping deepens the cone, higher transmissivity flattens it. Fundamental to well design, water supply, and contaminant capture.

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Data Inspector

Drawdown at well4.7 m

Drawdown at 50 m1.47 m

Radius of influence500 m

Governing equation

s (r) = \frac{Q}{2 π T} ln \frac{R}{r} = \frac{2000}{2 π \cdot 500} ln \frac{500}{r}

Reading this result: Drawdown is Q/(2πT)·ln(R/r): here it is about 4.7 m at the well and falls off logarithmically, so most of the depression sits in the first tens of metres.

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

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About this simulation

The full Excavation & Shoring 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 Excavation & Shoring

Excavation & Shoring for a cantilever balcony Excavation & Shoring for a bridge girder Excavation & Shoring for a floor joist Excavation & Shoring for a steel beam Excavation & Shoring for a timber deck Excavation & Shoring for a crane boom Excavation & Shoring for a retaining wall Excavation & Shoring 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 Excavation & Shoring 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.