Reproduction package for "Stiffness-extremum loads of proportionally loaded structures: sensitivity, computation, and verification"

Reproduction package for the manuscript Stiffness-extremum loads of proportionally loaded structures: sensitivity, computation, and verification (submitted). Contents. Exported hybrid tangent-stiffness matrices from Abaqus 2022 for two structural configurations (a circular arch and a pin-ended eccentrically compressed column); the Python scripts that turn them into every number reported in the paper; the derived result files for every reported number (JSON + CSV + small binary products); and the pre-print working draft. No Abaqus licence is required to re-analyse the data. The matrices were exported once under an institutional licence and are deposited here. See README.md inside the archive for the layout, the two reproduction routes, and the three boundaries one must know before starting.