Changelog¶

This page tracks notable changes across GenSec releases.

v0.2.0 (current)¶

Performance overhaul and architecture refinements.

Performance

Batch integration (integrate_batch()): evaluate thousands of strain configurations in a single vectorized NumPy call. Eliminates Python-loop overhead in all capacity generators.
Mega-batch with chunking: biaxial generators (generate_biaxial, generate_mx_my) concatenate all curvature directions into a single flat array and integrate in large chunks, reducing per-call overhead by 10–70×.
Analytical tangent stiffness (integrate_with_tangent()): compute internal forces and the 3×3 tangent matrix in one pass, halving the cost of each Newton-Raphson iteration.
Optional Numba JIT: when numba is installed (pip install gensec[fast]), stress and tangent kernels for Concrete and Steel are JIT-compiled to native code (~2–3× speed-up on large fiber arrays).
Measured end-to-end improvement: 15–40× faster on typical biaxial analyses.

Materials

tangent(eps) and tangent_array(eps) added to the abstract Material interface. Closed-form implementations for Concrete, Steel, and TabulatedMaterial. Finite-difference fallback in the base class for custom materials.
stress_array now accepts arrays of any shape (1-D, 2-D, …) across all built-in materials.

Geometry

RectSection is now a factory function returning a GenericSection directly, eliminating the former wrapper class with its 15 delegated properties.
GenericSection accepts optional n_grid_x / n_grid_y parameters for explicit grid control.
GenericSection exposes dx and dy attributes.
Isotropic grid by default: when n_fibers_x is omitted or set to 1, the grid cell size is derived from n_fibers_y (approximately square cells).

Verification

VerificationEngine auto-disables eta_2D / eta_path_2D when the resistance domain is 2-D (no My data), preventing QHull errors on degenerate contours.
_get_contour caches failures (degenerate contours at extreme N levels) as None to avoid expensive retries.

Output flags

New YAML flags: generate_moment_curvature, generate_polar_ductility, generate_3d_moment_curvature (all default true for backward compatibility).
Setting all three to false skips the computationally expensive moment-curvature pipeline entirely.

Phase 2 complete: biaxial bending and generic sections.

Generic section with arbitrary Shapely polygons and automatic fiber meshing (grid and triangular).
Parametric primitives: rectangle, circle, annulus, T, inverted T, H, box, single-tee slab, double-tee slab.
Biaxial bending: full \((N, M_x, M_y)\) resistance surface generation via curvature-angle scanning.
\(M_x\text{-}M_y\) contour diagrams at constant \(N\).
3-D resistance surface visualization.
Convex-hull demand verification in both 2-D and 3-D modes.
Combinations: named groups of demand triples with envelope \(\eta_{\max}\).
EN 10025-2 structural steel with thickness-dependent properties.
Multi-material bulk support for composite sections.
Per-fiber post-processing: strain/stress extraction and section state plots.
106 tests covering materials, solvers, infrastructure, and biaxial analysis.

Phase 0 + Phase 1: uniaxial bending for rectangular sections.