Computer Aided Structural Analysis


CASA-M is a counterpart of our Space Frame apps with adaptations for the desktop and mouse.

Salient features include: automatic on-the-fly analysis; choice of working unit system; multinational section library; section generator; comprehensively interactive graphics.

Technical Features

    The following level 1 features

  • Continuous automatic real-time analysis in response to changes.
  • Metric & imperial units.
  • Integrated extensive section library:
    • British: UB, UC, SHS, RHS, CHS, RSC, PFC, ERSA, URSA, RSJ, UBP
    • European: HD, HE, HL, HP, IPE, IPN, LE, LU, UAP, UPN
    • American: S, W, HP, S-HSS, R-HSS, O-HSS, C, MC, L
    • Canadian: S, M, W, WWF, HP, SLB, S-HSS, R-HSS, O-HSS, C, MC, L, WT, WWT [The HSS tables include both G40 (HS) and A500 (HA)]
    • Australian: UB, UC, WB, WC, SHS, RHS, CHS, PFC, EA, UA, TFB, UBP
    • South African: UBP, UBT, UCP, SHS, RHS, CHS, PFC, TFC, ERSA, URSA
    • Japanese: HJ
    • Russian: BFB, NFB, RSC
  • Integrated section generator for common shapes:
    • Open: I/H, channel, zed, angle, tee
    • Hollow: Oval, Rectangular
    • Solid: Oval, Rectangular
    • Calculates: Area, Inertia, Torsional constant, Elastic moduli, and mass per unit length
  • Integrated material library:
    • Steel, Aluminium, Concrete, Timber, Glass
  • Dimensional resolutions to 1mm (0.1” with imperial units).
  • Loading resolution to 2 significant figures.
  • Arbitrary combined loadings of point, couple, and trapezoidal loads, in both global and member-local axes.
  • Members can be rigid or pinned at either end.
  • Nodes may be restrained in a variety of ways.
  • Graphical and numerical results include:
    • Reactions.
    • Deflections.
    • Bending moments.
    • Shear forces.
    • Bending stress.
  • Numerical values for any position along a member.
    • Points of interest automatically determined.
  • Automatic gravity loading.
  • Plus the following level 2 features

  • Multiple loadcases.
  • Factored loadcase combinations.
  • Plus the following level 3 features

  • Members oriented to a third node.
  • Sway-cases based on load-cases and/or gravity.
  • Plus the following level 4 features

  • Multiple geometry groups.
    • Include or exclude geometry from the analysis.
User Interface

    The following level 1 features

  • Four simple interactive screens:
    • Geometry: for creating and editing nodes, members, supports, and section properties.
    • Loading: for creating and editing loads.
    • Results: for reading numerical results and viewing graphical deflections and force envelopes.
    • Utilities: unit system choice; on-line help; load/save file; reset.
  • Easy and accurate graphical drag-and-tap controls:
    • Rotate, pan, and zoom with simple gestures.
    • High precision positioning of nodes and loads by dragging with the mouse.
    • Simple graphical tap sequences to generate members and loadings.
    • Drag loads along to set position.
    • Drag loads and envelopes to specify magnitudes.
    • Drag marker along deflected shape or force envelope to read off value.
  • Numeric entry available if preferred:
    • Double-click on an input variable to enter its value numerically instead of graphically.
    • A built-in calculator is provided to add flexibility to numeric input:
      • Add or subtract offsets to dimensions.
      • Multiply and divide to scale dimensions.
      • Or simply enter a new value.
  • Section library presented as a straightforward selection:
    • Click on button in main window to open library.
    • Click on category (e.g. British UB).
    • Click on section size.
    • Diagram and properties will appear.
    • Rotate axes if desired, and tap Use to apply.
  • Custom property generator accessible in the library:
    • In library, choose custom category.
    • Diagram and properties will appear; double-click on a dimension to edit it.
    • Properties will automatically recalculate when dimensions are changed.
  • Plus the following level 2 features

  • Simple yet flexible actions make modelling easy:
    • Create & delete nodes, members, and loads by point-and-clicking.
    • Move & copy geometry.
    • Split members (loading automatically split accordingly).
    • Slide nodes along members, with optional automatic sympathetic movement of other geometry.
    • Change member spans, with optional automatic sympathetic movement of other geometry.
    • Replicate loading across members.
    • Optionally pin member ends.
  • Easy access to additional functions:
    • Document titles for title-block
    • Choice of unit system (UK Metric, EU Metric, and US Imperial).
    • On-line help.
    • Load, save, and reset models.
    • Transfer models between CASA apps and mobile devices (requires iOS 3.2+).
  • Report generation:
    • User-configurable content.
    • Highly graphical for visual interpretation of data.
    • On-screen preview.
    • Print or save as PDF file.
  • “Replay Demonstrations” giving annotated examples of common modelling techniques and how to use the program.
  • Plus the following level 3 features

  • Additional editing actions:
    • Rotate geometry.
    • Select items within a rubber-band selection box.
  • Plus the following level 4 features

  • Geometry groups.
    • Arrange by purpose, e.g. one group per floor.
    • Arrange by section type, e.g. columns and beams.
    • Represent extraneous structures by excluding groups from the analysis.
  • Additional editing actions:
    • Multiple copying of geometry for quick replication over a range of translations or rotations.
    • Reflect geometry.
    • Move loads between load-cases.
    • Move geometry between groups.
  • Solid rendering in geometry view.
    • Displays the structure with member cross-sections drawn to scale.
    • Colour-coded by groups.
  • Viewpoint memories.
    • Store and recall positions for viewing.


CASA-M homepage



CASA-M Features

Intuition Features


See also

Selector Guide

Mobile apps homepage

CASA-IV homepage