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Examples

Recognizable structural problems, built end to end through the typed apeSees bridge and checked against a known answer. They are the rungs of a ladder — the learning path is the ordered staircase they sit on.

  • Portal frame (2D) — two columns + a beam under gravity and lateral load; multiple element groups, drift, and a base shear that checks to exactly the applied load.

  • Modal analysis (cantilever) — g.masses + ops.eigen, the first three natural frequencies read back through Results and matched to the Euler–Bernoulli closed form.

  • Fiber sections & moment–curvature — a W14×90 fibre section (dimensions from apeSteel) driven through yield with ZeroLengthSection; the M–κ curve passes through $M_y=F_yS_x$ and plateaus at $M_p=F_yZ_x$, shape factor 1.10.

  • Multi-part assembly — build a column once as a reusable Part, stamp it three times with g.parts.add, and read each copy's deflection back by its own label (each exactly $PL^3/3EI$).

  • Tie non-matching meshes — two solid blocks meshed at different sizes, joined by a g.constraints.tie the bridge auto-emits; the load transmits exactly and the column matches the monolithic bar to ~3%.

  • STEP import: plate with a hole — import a CAD part, heal it, name edges by geometric query, refine at the hole, and recover the classic stress concentration $K_t\approx3$.

  • Choosing a results strategy — the same portal solved and read back via from_native and from_mpco (STKO); the read code is identical and both agree on the 8.39 mm drift to zero.

  • Compose modules — build the portal once, save it, and g.compose it into two bays; PGs come back label-prefixed (bay2.Columns) and each uncoupled bay drifts the exact E1 8.39 mm.

  • Pushover of a steel moment frame — a W14×90 fibre section (from apeSteel) in a forceBeamColumn pushed to a column-sway mechanism; the $V!-!\Delta$ capacity curve matches $K=2\cdot12EI_c/H^3$ to 2.7 % and $V_p=4M_p/H$ to 1.9 % at mechanism.

  • Plane-wave SSI: absorbing soil column — a soil column wrapped by an ASDAbsorbingBoundary3D skin (g.parts.add_plane_wave_box), shaken by a base shear pulse and flipped to absorbing with s.activate_absorbing; the wave arrives at the surface at $H/V_s$ and then radiates out (late motion < 1 % of peak) instead of reflecting.

  • Staged SSI: gravity then the absorbing flip — the canonical sequence: a gravity stage settles the column (5.6 cm) while the skin holds, loadConst freezes it, then s.activate_absorbing flips and the base wavelet shakes the equilibrated state. Shows why continuum body_force (always-on) is the wrong gravity route for a staged model and the g.loads.gravity + from_model route is right.

More rungs (shell-on-solid, transient) are landing wave by wave.

Beyond the curated set

The repo's examples/ directory holds many more models — buckling, contact springs, tunnel meshes, embedded rebars, soil–structure interaction. They are working material rather than teaching material; start with the worked examples above, then browse the repo when you need a starting point closer to your own problem.

Next: E1 — A 2D portal frame.