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Overview

This project involves a two-story residential house distinctively characterized by its Quonset hut roofline, a lightweight prefabricated structure made of corrugated galvanized steel with a semi-cylindrical cross-section. The exterior and interior walls, as well as the first floor, are constructed using LGS framing.

ORIGIN was commissioned to create structural construction drawings and conduct a structural analysis of the LGS framing and foundation of the building. Given that the project’s builder owns a Framecad rollformer, the production of CNC files for LGS panels was also required.

Input: A set of architectural drawings.

Project Deliverables:

  • Structural drawing set;
  • Structural analysis report;
  • LGS shop drawings;
  • Framecad CNC files for LGS panel production.
Services: STRUCTURE
Subservices:Light gauge steel framing design and detailing
Industry:Residential
Object type:Single-family home
Area:70 m² / 760 ft²
Tools used:Autodesk Revit, Strucsoft MWF Advanced Metal, SCIA Engineer, Tekla Tedds
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Project stages
1. Revit Model Creation
2. Structural Modeling
3. Structural Analysis Report Production
4. Drawings Production
5. LGS CNC Export and Shop Drawings
Code/Authority List:
  • 2019 California Residential Code (CRC);
  • 2019 California Building Code (CBC);
  • ASCE 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures.
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Step 1 — Revit Model Creation

The process begins with a thorough examination of the architectural drawings. A conceptual structural scheme is built in this phase, checking for structural viability and noting any issues for the architect’s review and adjustments. The PDF architectural drawings are then transformed into a clean Revit model, incorporating the foundation, floors, roofs, and walls as the basis for the forthcoming LGS framing.

Step 2 — Structural Modeling

Structural Modeling: After completing the Revit model, we initiate the LGS framing process using the Strucsoft MWF Advanced Metal software. This Revit plugin provides tools for the automated creation of LGS framing, factoring in the thicknesses of floors, roofs, walls, and openings. Following this, foundation modeling ensues.

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Step 3 — Structural Analysis Report Production

After the preliminary structural modeling is completed, a comprehensive structural analysis is undertaken. Calculations for LGS framing are done using SciaEngineer software, while Excel and Mathcad spreadsheets are employed for masonry walls and foundation calculations.

Our calculations comply with the following codes:

  • 2019 Edition of the International Building Code;
  • 2019 Edition of the International Residential Code;
  • ASCE 7-16: Minimum Design Loads and Associated Criteria for Buildings and Other Structures;
  • Steel Design: AISC 360-10/05 (ASD);
  • Cold-Formed Steel: AISI S100-16w;
  • Seismic: AISC 341-10/05;
  • Concrete: Reinforced Concrete Design Handbook (ACI);
  • Ultimate Strength: Design Handbook (ACI);

At the end of this page, you will find a full structural report.

Step 4 — Drawings Production

The validated LGS framing leads to the creation of Revit views like plans, sections, elevations, and details. The complete structural model negates the need for manual drawing, with the focus shifting to adding dimensions, annotations, and notes. The finalized plans are then submitted to the building department for approval.

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Step 5 — LGS CNC Export and Shop Drawings

Upon plan approval, the production of LGS panels begins, entailing the exportation of CNC files from the Revit model to the Framecad rollformer for the fabrication of profiles. The assembly of LGS panels from the members is aided by provided shop drawings, each labeled and dimensioned.

Drawings

Click on preview to view high resolution PDF drawings

Benefits
The LGS framing precisely aligns with the building's geometry, preventing installation issues onsite
The BIM model of the LGS framing facilitates clash detection with other trades
The CNC export feature enhances the efficiency of LSG panel production, significantly reducing manufacturing time
Tools used
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Autodesk Revit
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Strucsoft MWF Advanced Metal
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SCIA Engineer
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Tekla Tedds
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