41 lines
3.6 KiB
Markdown
41 lines
3.6 KiB
Markdown
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# Codemap: concentric-footing
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Hybrid (Typst + Python) structural calculation that checks a square, concentrically loaded reinforced-concrete spread footing per ACI 318-19: soil bearing, one-way shear, two-way (punching) shear, flexure, minimum steel, and concrete bearing. `calc.py` is the single source of truth; `footing.typ` presents only.
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Generated: 2026-08-21
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Files indexed: 13 (all deliverables present)
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## Layout
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```
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calcs/concentric-footing/
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├── calc.py [logic] — ACI 318-19 footing checks; Pint YAML → compute() → results.json; CLI --input/--output/--stdout.
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├── input.yaml [config] — Pint-quoted quantities; Blavatnik defaults (Ps, Pu, qa, Bf, Df, cover, fc, fy, lambda, column_width, base_plate_width, N, rebar_size).
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├── results.json [state] — last calc output: {tool, version, project, prepared_by, values, checks}.
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├── test_concentric_footing.py [test] — pytest lock of corrected ACI 318-19 benchmark (12 tests); imports calc.py:compute via importlib.
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├── footing.typ [logic] — Typst presentation sheet; imports lib/sheet.typ + results.json, derives loads, emits <concentric-footing-loads>/<concentric-footing-results>.
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├── generated/footing.pdf [doc] — compiled artefact (~204 KB).
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├── CONCENTRIC-FOOTING.pdf [doc] — reference: Blavatnik square footing 36in×36in×12in, 3000 psi, 4-#4 (contains known 68in vs 92in perimeter typo).
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├── PROJECT_STATE.md [doc] — architecture, pinned equations, units, tolerances, corrected benchmark, known limitations.
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├── TASKS.md [doc] — 5-task plan (001 numerical core, 002 pytest lock, 003 Typst sheet, 004 docs, 005 review).
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└── tasks/
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├── 001_calc_and_input.md [doc] — numerical core spec (calc.py + input.yaml + results.json).
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├── 002_numerical_tests.md [doc] — pytest lock spec (test_concentric_footing.py, compute() only).
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├── 003_typst_sheet.md [doc] — Typst presentation spec (footing.typ + compile + metadata query tests).
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├── 004_docs_refresh.md [doc] — README + codemap refresh spec.
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└── 005_review.md [doc] — reviewer pass spec (engineering + deterministic evidence + simplify).
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```
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(footing.typ and generated/footing.pdf are now present on disk — see layout above.)
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## Hot Spots
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- `calcs/concentric-footing/calc.py` — single source of truth for all six ACI 318-19 checks; any equation change must be reconciled with `test_concentric_footing.py` and the benchmark in `PROJECT_STATE.md`.
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- `calcs/concentric-footing/PROJECT_STATE.md` — pins every equation, unit, tolerance, and the corrected benchmark; the builder must not invent behavior beyond it.
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- `lib/sheet.typ` (in worksheets root, external) — shared `calc-line` / `check` helpers used by `footing.typ`; changing them breaks every sheet's PDF.
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## Conventions
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- Hybrid Pint pattern: `input.yaml` (quoted quantity strings) → `calc.py:compute()` → `results.json` {tool, version, project, prepared_by, values, checks} → `footing.typ` (presents only, no recomputation) → PDF compiled with `--root .` from `worksheets/`.
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- Load determination (DL/LL, tributary area, column self weight) is derived in Typst and emitted as `<concentric-footing-loads>`; Python reads checked `Ps`/`Pu`. The test suite reconciles them.
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- Pin one hand-calculated example in `pytest.approx` before treating the tool as stable; correct reference typos in the Scope note rather than reproducing them.
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