Corrected cross-section calculations for common profiles
- Fixed hollow round tube torsion and inertia formulas, including the diameter-based inputs shown in the UI. edd873a
- Fixed rectangular and rectangular tube axis mapping so section height correctly drives vertical beam stiffness. 85d5690
- Fixed I-beam axis mapping so depth contributes to the strong bending axis used by vertical deflection calculations. e867a79
- Added formula tests with separately checked values, including ASTM W-shape catalog coverage for I-beams. e867a79