CSA S16 Canadian Steel Design
Perform factored resistance checks for structural steel members according to CSA S16-19. Our calculator integrates section classification, member stability, and interaction formulas.
Design Check Methodology
CSA S16 classifies sections into Classes 1 (Plastic), 2 (Compact), 3 (Non-compact), and 4 (Slender). This determines whether the member can achieve its plastic moment capacity or if its strength is limited by local buckling.
Clause Compliance Coverage:
- Tensile Resistance (13.2): Gross section yield and net section fracture checks.
- Compressive Resistance (13.3): Uses the 'n' exponent for different fabrication types (Rolled vs. Class H vs. Class C).
- Flexural Resistance (13.5): Evaluates major and minor axis bending with LTB considerations.
- Shear Resistance (13.4): Standard web shear checks for various section types.
- Interaction (13.8): Combined axial and bending checks using U1 amplification factors.
The 'n' Exponent
The value of n determines the shape of the buckling curve. n=2.24 is used for stress-relieved HSS (Class H), while n=1.34 is the default for most rolled sections and Class C HSS.
U1 Amplification
CSA S16 accounts for P-δ effects using the U1 factor (U1 = ω1 / [1 - Cf/Ce]), ensuring stability under second-order effects.