Professional AS 4100 Structure Analysis
Evaluate structural steel member capacities according to AS 4100:2020. This calculator automates section slenderness, member stability, and combined action interactions.
Design Check Methodology
AS 4100 classifies sections as Compact, Non-compact, or Slender. This determines the effective section modulus (Ze) used for bending and the form factor (kf) for compression.
Clause Compliance Coverage:
- Tension Capacity (Sec 7): Evaluates gross section yield and net section fracture.
- Compression Capacity (Sec 6): Calculates φNc using the appropriate buckling curve (αb).
- Bending Capacity (Sec 5): Checks for lateral-torsional buckling (φMb) and local yielding.
- Shear Capacity (Sec 5.11): Web shear yielding and shear-moment interaction checks.
- Combined Actions (Sec 8): Cross-section and member stability for axial + biaxial bending.
Residual Stress Effect
The residual stress category (HR, SR, CF, etc.) significantly impacts the plate slenderness limits (λ_ey, λ_ep), which in turn determines the cross-section classification.
Shear-Moment Interaction
Under Clause 5.12.3, high shear can reduce moment capacity. Our calculator checks if V* > 0.5φVv and applies the necessary reduction to capacity calculations.