SOLVER
✓ Direct Stiffness Method (DSM)
✓ 12-DOF 3D Euler-Bernoulli beam elements
✓ Linear elastic, small displacement (1st order)
✓ Member end releases (pinned ends via static condensation)
✓ Section rotation β about member axis
✓ Notional forces φ=1/200 of total factored gravity (§5.3.2)
− No shear deformation (Bernoulli, not Timoshenko)
− No geometric nonlinearity (no full P-δ)
− No semi-rigid joints (rigid or pinned only)
P-Δ (SWAY)
✓ αcr computed per EN 1993-1-1 §5.2 Eq. 5.2
✓ Amplified sway method applied when 3 ≤ αcr < 10
− No iterative geometric nonlinear analysis (αcr < 3 not supported)
EC3 CHECKS (EN 1993-1-1)
✓ §6.2 Section resistance (Class 1/2/3 aware)
✓ §6.3.1 Flexural buckling y-y and z-z (curves a/b/c/d)
✓ §6.3.2 LTB with C1 moment gradient (NCCI SN003b)
✓ §6.3.3 Beam-column interaction (Annex B Method 2)
✓ Warping included in Mcr (Iw from section library)
✓ Effective length ky, kz and LTB restraint length LLT per element
✓ Biaxial bending & interaction (§6.2.9(6), §6.3.3 both axes)
✓ Shear-moment interaction §6.2.8 when V > 0.5 Vpl
✓ In-span moment recovery (mid-span peaks included in checks)
✓ Shape-aware buckling curves (I/H, hollow, channel)
⚠ Class 4 flagged but effective section NOT computed
⚠ Torsion Mx flagged but not checked (§6.2.7)
− No torsional-flexural buckling (§6.3.1 flexural only)
LOADS & COMBINATIONS
✓ EN 1990 eq. 6.10 with leading-action permutations (Q/W/S rotate as lead)
✓ Favorable γG = 1.00 permutation for uplift cases
✓ Editable γ and ψ factors (Combination Factors panel)
✓ Global load projection for inclined members (correct for gravity on rafters)
For preliminary design and screening only. Results must be verified by a qualified engineer using full code-compliant software before use in construction documents.