The homework toolbox
Every tool here exists because a homework needs it β most of them to compute something, one of them to draw the figure the write-up asks for. They run entirely in your browser β nothing to install, nothing to license β and the calculators are built to let you check hand calculations, not skip them.
2 of 20 are open. The rest unlock alongside the homework that needs them, so the toolbox grows with the course rather than arriving all at once.
The figure every write-up needs and nobody wants to redraw: a true-to-scale 3-D pavement section, eighteen procedural materials, thirteen airfield and highway templates β and the PNG copied straight to your clipboard, with or without a background.
Truck axle configurations and aircraft landing gear drawn true to scale in 3-D, with spacings and track widths as measurable dimensions β and contact-patch corner coordinates exported in millimetres for a finite-element pre-processor.
Fit kβ, kβ, kβ of the generalized Mr model to triaxial data β live LINEST-style regression with RΒ², a parity plot, and paste-from-Excel input.
Reduce a piston penetration test to a CBR, with the tangent construction that corrects a concave-up curve β and a toggle to see how much that correction is worth.
The real N-layer elastic solution in your browser: stresses, strains and deflections at any depth, dual and tandem wheels superposed β a check on WinJULEA, not a substitute for understanding it.
One-layer (Boussinesq) response under a circular load: stress, strain, and deflection profiles, a draggable depth probe, and the classic Οz/p pressure bulb.
Exact AASHTO load equivalency factors, a mixed axle spectrum with presets, and the full design-lane projection β D, L, growth β shown factor by factor.
Four published criteria for converting duals to one wheel, which give four different answers β 5630 to 7410 lb on the same example in Huang. The question is which failure mode you are designing against.
Surface infiltration by Ridgeway and Cedergren, groundwater and meltwater inflow, drainage-layer capacity and time to drain, Manning pipe sizing, and filter criteria.
The 1993 design equations solved in any direction β SN, slab thickness, reliability, roadbed support β with the layered thickness solution and the seasonal effective k.
Feed WinJULEA strains through the HW8 transfer functions: rutting per layer, Minerβs damage, and bottom-up cracking growing with every repetition.
Fatigue and erosion damage summed over an axle load distribution. You read four values off the PCA tables; the tool runs both criteria and tells you which one governs.
Dowel group action, bearing stress, tie bars, joint opening and faulting β under the three different conventions Huang uses in three different places, one of which may fail your design.
Every published case in Huang Ch. 4 β interior, edge under both circular and semicircular contact, and corner by both the original and Ioannides formulas, which disagree. Plus Bradbury curling and the dual-tyre equivalent circle.
Asphalt has no single modulus. Predict |E*| by two published routes that disagree by 65%, then shift the isotherms onto one master curve β and read whether time-temperature superposition actually held.
The forward problem run backwards: a measured deflection basin becomes layer moduli, by layered-elastic inversion and by the AASHTO closed form β plus the sensitivity that says which of those moduli the data actually determines.
Give every design input a coefficient of variation and watch the reliability fall out. Ranks which input owns the uncertainty, and runs Taylor, Rosenblueth, and Monte Carlo side by side.
Fit the PSI equation yourself to a rating panel and watch the rut coefficient come out 27x the published value with an R-squared above 0.98. Plus skid number against speed.
Parse runway rating codes and decide where an aircraft may operate β strength, subgrade category, tyre pressure, and the occasional-overload allowance.
Life-cycle GHG for one lane-mile across all six stages, with the IRI sawtooth driving the rehab schedule and every inventory factor editable.