Lengths in mm, E and fy in MPa. Laterally bracing at kb·L segments along the span. To use a different section database: Load section table (.csv)
a, b in fractions of bf and d; c in fraction of bf (flange cut depth).
Predicts the moment–rotation (M-θ) backbone of wide-flange beams in fully restrained (rigid) beam-to-column connections, with or without a reduced beam section (RBS), using the deterioration model of Lignos and Krawinkler (2011). You can save each plot as PNG or SVG and the curve data as CSV.
Developed by Dr Ahmed Elkady, University of Southampton. Email: a.elkady@soton.ac.uk · Homepage
These tools are provided for research and educational purposes only, without warranty of any kind. The predictions are estimates from the cited models and are only as reliable as those models within their validity ranges. Results should be checked independently by a qualified engineer before being used in design or assessment.
© 2026 Ahmed Elkady, University of Southampton. All rights reserved.
