Model deck, girder, and traffic effects in one place. Compare service and factored demand quickly. Visualize load paths, moments, and reactions for smarter planning.
The page uses a stacked layout overall, while the calculator inputs switch to three columns on large screens, two on medium screens, and one on mobile devices.
This example table helps users understand typical input-output patterns for preliminary bridge screening.
| Case | Support | Span (m) | Dead Load (kN/m) | Live + Impact (kN/m) | Service Load (kN/m) | Factored Load (kN/m) |
|---|---|---|---|---|---|---|
| Urban Overpass | Simply Supported | 24 | 42.80 | 36.50 | 79.30 | 117.35 |
| Rural Highway Span | Simply Supported | 30 | 47.20 | 41.56 | 88.76 | 132.43 |
| Inspection Platform | Cantilever | 12 | 18.40 | 12.25 | 30.65 | 44.33 |
In these expressions, w is line load, L is span length, E is elastic modulus, and I is moment of inertia.
It estimates dead load, live load with impact, service load, factored load, support reaction, maximum shear, maximum moment, and elastic deflection for preliminary bridge checks.
Yes. The calculator includes both support conditions and automatically switches the relevant reaction, shear, moment, and deflection formulas after submission.
Tributary width converts area loads on the deck into line loads carried by a girder or effective strip. A larger width produces larger line load demand.
The impact factor increases the live load to reflect dynamic effects from moving traffic, vibration, and short-duration amplification that can raise bridge demand above static values.
It is the highest ratio among moment, shear, and deflection checks. When the value exceeds 1.00, the bridge section or assumptions should be reviewed.
No. This tool is best for preliminary sizing, screening, and comparison. Final bridge design should follow project codes, detailed analysis, and qualified engineering review.
Use the values required by your governing bridge code or design standard. The default values are only typical placeholders for early-stage checking.
Stiffness controls elastic deflection. Even when strength is adequate, excessive movement can affect serviceability, user comfort, finish performance, and long-term durability.
This calculator simplifies bridge action as a uniformly distributed load problem. For final work, include load combinations, lane placement, dynamic effects, fatigue, bearing behavior, continuity, seismic demand, and code-specific requirements.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.