Free Online Frame Analysis Software

Analyse portal frames, rigid frames, and multi-storey structures in 2D or 3D. Run Linear, P-Delta, Buckling and Modal analysis, then inspect forces, deflections and member stresses. No signup or download required.

Inspect elastic member stress contours across a structural frame

Frame Types You Can Analyse

AutoCalcs handles all common frame configurations used in structural engineering. From simple portal frames to complex multi-storey buildings, get accurate results using finite element analysis.

Frame Configurations

  • Portal frames (single & multi-bay)
  • Multi-storey rigid frames
  • Moment-resisting frames
  • Braced frames

Analysis Types

  • Linear static analysis
  • P-Delta (2nd order) effects
  • Elastic buckling analysis
  • Modal analysis

Results

  • Bending moment diagrams
  • Shear force diagrams
  • Axial force diagrams
  • Deflected shape & sway
  • Elastic member stress contours

Modelling Features

  • Pin & fixed connections
  • Member end releases
  • Real section library
  • Copy & extrude tools

2D and 3D Frame Analysis

While many online calculators only handle simple 2D frames, AutoCalcs gives you full 3D capability. Model frames in any orientation, apply loads in any direction, and capture true structural behaviour including out-of-plane effects.

For 2D analysis, simply work in a single plane-the tool handles both cases seamlessly.

P-Delta, Buckling and Modal Analysis for Frames

Second-order (P-Delta) effects are critical for frames, especially tall or slender structures. AutoCalcs includes P-Delta analysis to capture the additional moments and forces caused by gravity loads acting on the deflected shape.

Elastic buckling analysis calculates critical load factors and instability mode shapes. Modal analysis calculates natural frequencies, vibration mode shapes and mass participation. All three analysis types are available directly in the frame analysis tool.

How It Works

AutoCalcs uses finite element analysis so you can model portal frames, multi-storey buildings, and custom rigid or braced frames in 2D or 3D, not just a fixed set of textbook cases.

  1. Build the frame - Use the structure wizard for portals and multi-storey layouts, or draw freeform geometry
  2. Set supports and connections - Fixed bases, pins, rollers, and member end releases where needed
  3. Assign sections and materials - Pick real sections from the library and assign materials
  4. Apply loads - Point loads, member loads, self-weight, and load combinations
  5. Choose the analysis - Linear static, P-Delta, buckling, or modal
  6. Inspect results - Moments, shear, axial force, deflected shape, sway, and member stress contours

Why Choose AutoCalcs for Frame Analysis?

  • Instant Access - No installation. Start modelling in your browser immediately.
  • Design Code Checks - Integrated AISC 360, Eurocode 3, AS 4100, and CSA S16 steel design checks (usage limits apply).
  • Professional Accuracy - FEA-based solver using the Direct Stiffness Method.
  • P-Delta, Buckling & Modal Included - Second-order, elastic buckling, and natural-frequency analysis at no extra cost.
  • Open Source Engine - Powered by verified open-source FEA libraries.

Start Analysing Frames Now

No download. No signup. Just open and start modelling.

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