FutolStructure is a browser-based structural engineering workbench for reinforced-concrete building layout, gravity load-path review, tributary area visualization, 3D coordination, and solver handoff preparation.
Open the live technical preview | Deployment | Security
Important
FutolStructure is an engineering decision-support and model-preparation tool. It does not replace project-specific analysis, code checks, geotechnical input, detailing, or review and signing by the responsible licensed engineer.
flowchart LR
A[Grid and floor intent] --> B[Active structural geometry]
B --> C[Tributary and gravity load path]
C --> D[Plans, schedules, and 3D review]
D --> E[DXF, IFC, STAAD, and ETABS handoff]
- Grid-based RC framing with columns, beams, slabs, cantilevers, corner slab patches, and floor-specific controls.
- Tributary area and gravity load distribution from slabs to beams, columns, footings, and base reactions.
- Plan drafting aids including coordinated member tags, grid bubbles, dimensions, ortho measurement, snapping, and lock indicators.
- 3D review with display schemes, member colors and opacity controls, foundation geometry, slab transparency, and stair geometry.
.fstrproject save/load with guarded autosave, immutable pre-overwrite revisions, destructive-change review, recovery diagnostics, floor deletion warnings, and persisted member locks.- Stair Builder geometry with destination slab openings, DXF footprint output, and 3D review.
- Reports and schedules for columns, beams, slabs, footings/base reactions, and preliminary design summaries.
- Coordinated multi-floor DXF drawing packages, IFC2x3, STAAD.Pro, ETABS 22 OAPI, and ETABS-to-SAFE handoff paths.
FutolStructure uses a shared active-model payload so geometry counts and member intent remain coordinated across export targets.
| Target | Current status |
|---|---|
| DXF | AutoCAD R12 ASCII (AC1009) exports every floor layout and tributary plan, foundation/base reactions, synchronized schedules, load summary, and preliminary BOQ tables on governed structural layers. Output is parser-audited and round-trip checked with ezdxf; the recovered Olango package also opens in AutoCAD 2025 Core Engine without recovery. |
| IFC2x3 | Active columns, beams, slabs, and storey organization are exported for BIM review. |
| STAAD.Pro | The gravity baseline, frame/plate geometry, beam insertion offsets, and statics balance were validated in STAAD.Pro 2024. |
| ETABS 22 | The OAPI builder creates a dated working copy, assigns the governed mass baseline, runs modal analysis, and exports audit artifacts. |
| SAFE | The supported handoff remains ETABS story export plus governed base reactions; direct browser-authored SAFE models are not claimed. |
Validated baselines do not imply final lateral design, detailing compliance, or permit readiness for an arbitrary project. The current reliable envelope is regular orthogonal low-rise RC framing; irregular and transfer behavior requires explicit solver review.
No build step is required for the current static application.
git clone https://github.com/michaelfutol/futolstructure.git
cd futolstructure
python -m http.server 4173Open http://127.0.0.1:4173/v3/index.html.
Run the syntax and engine smoke check:
node v3/tools/check-fs.js --no-browserRun the full browser smoke check with Chrome or Edge installed:
python -m pip install -r v3/tools/requirements-dxf.txt
node v3/tools/check-fs.jsThe browser smoke covers initialization, plan geometry, slab ownership, cantilever behavior, persistence and recovery guards, protected-revision restore/download, the 50-revision retention limit, historical .fstr migration, member locking, measurement tools, stair persistence, 3D rendering, coordinated DXF completeness, strict DXF open/audit/save/reopen validation, and export payload parity.
Where AutoCAD 2025 is installed, run the native read gate against a generated package without modifying it:
powershell -File v3/tools/check-dxf-autocad.ps1 -DxfPath "path/to/package.dxf"futolstructure/
|-- .github/ Release checks and contribution templates
|-- docs/ Launch, security architecture, and release notes
|-- v3/
| |-- assets/ Product identity and screenshots
| |-- engine/ Extracted structural calculation helpers
| |-- persistence/ Protected project revision storage
| |-- tools/ Regression smoke runner
| `-- index.html Current application
|-- index.html Hosted root entry
|-- vercel.json Static deployment and security headers
`-- README.md
- The public technical preview is local-file first and does not yet provide user accounts or cloud project storage.
.fstrmodel data stays in the browser or in files explicitly saved by the user.- Experimental client-side AI key panels are disabled for the public preview. Future AI or collaboration features must use an authenticated server boundary and explicit project-data consent.
- Private project files and native solver artifacts are excluded from source control and Vercel deployments.
See SECURITY.md for vulnerability reporting and docs/AUTH_SECURITY_PLAN.md for the planned Supabase authentication and row-level-security architecture.
- Production preview: https://futolstructure.vercel.app
- Custom domain target: https://futolstructure.futoltech.com
- Release workflow: pull request preview, automated validation, merge to
main, then Vercel production deployment.
The custom domain requires its DNS record before it becomes public. See docs/LAUNCH_PLAN.md for the exact record and verification command.
The product is under active technical validation. Near-term work focuses on protected .fstr revisions, solver export truth, authenticated cloud projects, stair analytical connectivity, and continued BIM round-trip testing.
Contributions should preserve engineering traceability and avoid claims beyond validated behavior; read CONTRIBUTING.md before opening a pull request.
FutolTech - Engineering & Project Systems
Copyright (c) 2026 Michael Futol. All rights reserved. See LICENSE.