Design Codes Coverage
How the site aligns with major steel design standards (AISC, AS 4100, EN 1993, CSA) without reproducing copyrighted text.
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What you’ll find here
- A structured directory of steel design standards coverage.
- Short descriptions of what each page covers, plus the limitations.
- Verification and documentation links so you can use calculators responsibly.
- Cross-links to standards coverage to clarify terminology differences.
Standards coverage pages
AISC 360-22 Steel Design Standard -- Coverage & Interpretation -- American steel design: LRFD/ASD, phi factors, bolt and weld capacity provisions, and seismic detailing per AISC 341.
AS 4100:2020 Australian Steel Structures Standard -- Australian steel design: limit state design, capacity factors, bolt grades 8.8/10.9, and connection detailing per AS 4100.
EN 1993-1-1 Eurocode 3 Steel Design Standard -- European steel design: partial safety factors, cross-section classification, LTB method, and connection design per EN 1993-1-8.
CSA S16-19 Canadian Steel Design Standard -- Canadian steel design: limit states, resistance factors, bolt and weld provisions, and seismic design per CSA S16.
Why these pages exist
The calculators are designed to be standard-aware, but standards use different terminology, factors, and definitions.
The purpose of these code coverage pages is to help you map inputs (and expectations) to the standard you are actually required to use, without copying copyrighted code text.
If you need authoritative requirements, purchase/consult the official published standard for your jurisdiction.
Code comparison and selection guidance
Selecting the correct design standard is one of the most important decisions in any structural steel project. The governing standard determines the design philosophy, safety factors, material requirements, and connection design rules that apply to your project.
AISC 360-22 (United States)
AISC 360-22, the Specification for Structural Steel Buildings, is the governing standard for steel design in the United States. It uses both Load and Resistance Factor Design (LRFD) and Allowable Stress Design (ASD) methodologies. Key features include:
- Design philosophy: LRFD uses load factors of 1.2D + 1.6L for gravity loads and resistance factor phi applied to nominal strengths. ASD uses a safety factor omega applied to nominal strengths with service loads.
- Bolt design: Bolt shear capacity uses phi = 0.75 for LRFD or omega = 2.0 for ASD per Table J3.2. Bearing strength uses phi = 0.75.
- Weld design: Fillet weld capacity uses phi = 0.75 (LRFD) or omega = 2.0 (ASD) per Table J2.5 and J2.6.
- Base plate design: Concrete bearing uses phi = 0.65 per AISC 360 Chapter J8.
- Seismic provisions: AISC 341-22 provides seismic design requirements for steel structures, including connection detailing for special, intermediate, and ordinary moment frames and concentrically braced frames.
AS 4100:2020 (Australia)
AS 4100:2020, the Steel Structures Standard, is the Australian standard for steel design. It uses a limit state design methodology with capacity factors and load factors from AS/NZS 1170.0. Key features include:
- Design philosophy: Limit state design with capacity factor phi applied to nominal capacity. Load combinations follow AS/NZS 1170.0.
- Bolt design: Bolt shear capacity uses capacity factor phi = 0.8 for standard bolts per Table 3.4. Bolt grades commonly used are 8.8 and 10.9.
- Weld design: Fillet weld design uses the SP (strength per unit length) method based on the weld throat thickness and electrode classification.
- Base plate design: AS 4100 Clause 7 provides base plate design provisions including concrete bearing, plate bending, and anchor bolt requirements.
- Section classification: Compact, non-compact, and slender element classifications per Table 5.1 with section slenderness limits.
EN 1993-1-1 Eurocode 3 (European Union)
EN 1993-1-1, Eurocode 3: Design of Steel Structures, is the European standard used throughout the European Union and many other countries. It uses partial safety factors with limit state design. Key features include:
- Design philosophy: Partial safety factors gamma_M0, gamma_M1, gamma_M2 applied to different limit states. Load combinations follow EN 1990 (Eurocode Basis of Design).
- Material grades: Common grades include S235, S275, S355, and S460 with yield strengths from 235 MPa to 460 MPa.
- Cross-section classification: Classes 1 through 4 based on width-to-thickness ratios, affecting the extent of plastic stress distribution allowed.
- Bolt design: EN 1993-1-8 provides bolt design rules with partial safety factors for bolt grades 4.6, 5.6, 6.8, 8.8, and 10.9.
- Weld design: EN 1993-1-8 covers fillet weld design using the directional method or simplified method.
- Lateral-torsional buckling: EN 1993-1-1 provides LTB verification using the reduction factor method with the appropriate buckling curves.
CSA S16-19 (Canada)
CSA S16-19, Design of Steel Structures, is the Canadian standard for steel design. It uses limit states design methodology. Key features include:
- Design philosophy: Limit states design with resistance factors. Load combinations follow the National Building Code of Canada (NBCC).
- Material grades: Common steel grades include 350W (350 MPa yield) and 260W (260 MPa yield).
- Bolt design: CSA S16 Clause 13 provides bolt shear, tension, and combined capacity with appropriate resistance factors.
- Weld design: CSA S16 Clause 13 covers weld capacity with electrode strength and weld size considerations.
- Seismic design: CSA S16 Clause 27 provides seismic design requirements including ductility-related and overstrength-related force modification factors.
How to determine your applicable standard
The design standard applicable to your project is determined by your jurisdiction's building code. In the United States, the International Building Code (IBC) references AISC 360. In Australia, the National Construction Code (NCC) references AS 4100. In the European Union, each member state publishes a National Annex to EN 1993 specifying nationally determined parameters. In Canada, the NBCC references CSA S16.
Always confirm the specific edition and any amendments applicable to your project location with the project specification or the authority having jurisdiction.
Navigation guidance for this hub
Use this hub to understand how each design standard is implemented in the site's calculators. Each code coverage page explains the key provisions, terminology differences, and factors used for that standard. When using a calculator, select your standard from the dropdown to ensure the appropriate factors and formulas are applied.
If you work across multiple jurisdictions, the code coverage pages help you understand how the same design check (e.g., bolt shear capacity) is handled differently in each standard. This is particularly useful for international projects or when reviewing designs prepared under a different standard.
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Frequently Asked Questions
Why not just show a navigation menu?
Menus are useful, but hub pages add unique explanatory text and organized link blocks. This reduces thin/duplicate signals and improves crawl paths.
Do these calculators follow every clause of every standard?
No. Standards are extensive and context-dependent. The calculators support educational workflows and screening checks; final design requires full code compliance verification.
Is this site a substitute for engineering software?
No. Treat it as a fast toolset for early iteration and learning. Use validated analysis/design software and professional review for real projects.
How should I link to results?
Link to the clean route (no query parameters). If you share inputs, do it in a controlled way that does not generate infinite indexable URL variants.
Where is the verification guide?
Use the verification guide for a QA workflow that applies to any calculator result.
Can I request support for an additional standard? Use the feedback link to suggest a new standard. Priority is based on user demand and engineering safety impact.
How do I switch between design standards in the calculators? Each calculator includes a standard selector dropdown. Select AISC 360, AS 4100, EN 1993, or CSA S16 from this dropdown. The calculator will update the design factors, formulas, and output format to match the selected standard. All inputs remain the same, but the capacity calculations use the appropriate code provisions.
Related pages
- AISC 360-22 Steel Design Standard
- AS 4100:2020 Australian Steel Structures Standard
- EN 1993-1-1 Eurocode 3 Steel Design
- CSA S16-19 Canadian Steel Design Standard
- Bolted Connection Design Calculator
- Welded Connection Design Calculator
- Steel Beam Capacity Calculator
- Steel Column Capacity Calculator
- Steel Design Code Comparison Table
- How to Verify Structural Calculations
- Disclaimer (educational use only)
Disclaimer (educational use only)
This page is provided for general technical information and educational use only. It does not constitute professional engineering advice, a design service, or a substitute for an independent review by a qualified structural engineer. Any calculations, outputs, examples, and workflows discussed here are simplified descriptions intended to support understanding and preliminary estimation.
All real-world structural design depends on project-specific factors (loads, combinations, stability, detailing, fabrication, erection, tolerances, site conditions, and the governing standard and project specification). You are responsible for verifying inputs, validating results with an independent method, checking constructability and code compliance, and obtaining professional sign-off where required.
The site operator provides the content “as is” and “as available” without warranties of any kind. To the maximum extent permitted by law, the operator disclaims liability for any loss or damage arising from the use of, or reliance on, this page or any linked tools.