These browser-based calculators run entirely in your browser — no download, no license, no Excel required. They share the same algorithms and design-code references as our spreadsheet tools and are freely available to all visitors.
Performs axial force–moment (P-M) interaction and moment–curvature analyses for members of circular and rectangular cross-section. Complies with AASHTO LRFD. Uses the Mander model for the confined and unconfined concrete stress–strain relations
Calculates shear resistance of the eccentrically loaded bolt group using the elastic and instantaneous center of rotation methods per AISC LRFD. Supports standard and irregular bolt layouts with a live graphical display.
Computes moment and shear influence lines at any section of a continuous beam with up to 8 spans and variable EI. Slides a user-defined truck (default HS20) in both directions and combines with lane load to generate moment and shear force envelopes along the full beam length.
Performs biaxial analysis of general-shaped base plates under combined axial load, biaxial moment, shear, and torsion. Supports rectangular, circular, polygon, and custom plate shapes with openings.
Computes natural frequencies, mode shapes, and modal participation factors for continuous beams. Supports variable stiffness, distributed and concentrated masses. Displays animated mode shapes with interactive deflection readout.
Interactive analysis of a beam on a Winkler elastic foundation with arbitrary point and linear distributed loads. Performs non-linear analysis when a compression-only subgrade option is selected.
It's a spin off of a popular spreadsheet PSLoss. Build a tendon profile from parabolic and straight segments and calculate elongations and stresses along the tendon. Handles stressing at one or both ends, using AASHTO or Eurocode equations.
