Free 3D Frame Analysis Software

Analyse 3D space frames, multi-storey buildings, and complex structures in your browser. Full finite element analysis with wind loads, gravity, and P-Delta effects—no signup or download required.

3D frame analysis with results in AutoCalcs

Build and analyse 3D structures with real-time rendered views

Full 3D Structural Analysis

Most free structural calculators are limited to 2D. AutoCalcs gives you a full 3D modelling environment where you can build space frames, apply loads in any direction, and capture true three-dimensional behaviour including biaxial bending, torsion, and out-of-plane effects.

3D Structures

  • Multi-storey buildings
  • Space frames and towers
  • 3D portal frames
  • Platforms and mezzanines

Analysis Capabilities

  • 6 DOF per node (full 3D)
  • P-Delta (2nd order) effects
  • Biaxial bending and torsion
  • Multiple load combinations

Results

  • 3D deflected shape
  • Moment, shear, axial diagrams
  • Torsion diagrams
  • Support reactions (all 6 DOF)

Modelling Tools

  • Grid and elevation snapping
  • Copy, mirror, and extrude
  • Real section library
  • Pin, fixed, and custom supports

Why 3D Analysis Matters

Real structures are three-dimensional. Wind loads act in multiple directions, floor diaphragms distribute lateral forces, and columns experience biaxial bending. A 2D frame analysis only captures behaviour in one plane—missing the interaction between orthogonal frames that governs real structural response.

With AutoCalcs, you can model the complete 3D structure: apply wind in X and Z directions, define separate load cases for each, and let the solver determine the true force distribution through the entire frame system.

The Sample 3D Frame

Click "Try a 3D Frame Model" above to open a pre-built 2-storey, 2-bay 3D frame with 12 nodes, 18 members, and 4 load cases (dead, live, wind X, wind Z). It includes UDLs on floor beams, point loads for wind, diagonal bracing, and realistic load combinations. Run the analysis instantly to see the full 3D results.

Why Choose AutoCalcs?

  • True 3D — Not a 2D tool with a 3D view. Full 6-DOF analysis with out-of-plane effects.
  • Design Code Checks — Integrated AISC 360, Eurocode 3, AS 4100, and CSA S16 steel design checks (Pro).
  • P-Delta Included — Second-order geometric nonlinearity at no extra cost.
  • Instant Access — No installation, no signup. Build your 3D model in the browser.
  • Open Source Engine — Powered by verified open-source FEA libraries.

Start 3D Analysis Now

No download. No signup. Just open and start modelling in 3D.

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