Descente de charges
Tributary Area Charge Calculatrice
Use this page when a poutre collects charge from a one-way slab, deck, or roof strip et the first task is to turn area pressure into a practical line charge.
Contexte geometrique
Charge surfacique (kN/m²)
Charge ponctuelle (kN)
Conversion de charge
3.2m
6m
Charge lineique8.00 kN/m
Charge totale52.0 kN
Calculation Basis
Assumptions & Limits
- The conversion assumes a clear tributary width et a one-way charge path.
- Charge factors, combinations, et code partial factors are not applied automatically.
- Local peaks, openings, or two-way slab behavior need separate ingenierie revue.
Reference Basis
- Documentation: Methodology
- Documentation: Engineering Review
- Roark's Formulas for Stress and Strain
- Mechanics of Materiaux references
- Tributary-area et charge-takeoff references
Typical Starting Case
| Tributary width | 3.2 m one-way strip |
| Surface charge | 2.5 kN/m^2 |
| Poutre portee | 6.0 m |
| Additional point charge | 4 kN optional local load |
| Best use | Preparing beam inputs from floor or roof loading |
How To Use This Page
- Start here when the structural question begins on the slab or deck, not on the poutre itself.
- Keep the tributary width honest. If the supported area changes along the portee, the simple one-width model becomes only an early approximation.
- After the line charge is prepared, continue into a poutre page, a charge-combination page, or a serviceabilite check depending on the next decision.
Key Formulas
- Area to line charge: w = q x b_tr. Uniform surface pressure q multiplied by tributary width.
- Total poutre charge: W = w L + P. Full-portee line charge plus any extra concentrated action.
- Poutre handoff: Use w as the starting line charge in the poutre solveur. This page prepares the charge; it does not replace the poutre-response calculation.
Questions frequentes
- When is a tributary-area model appropriate? It is appropriate when the supported floor, deck, or roof charge travels mainly in one direction into the poutre et the influence width can be defined clearly.
- Why does this page keep the poutre portee if the main output is line charge? Because many engineers also want the total unfactored member charge at the same time, especially when checking reactions, appui takeoff, or quick quantity comparisons.
- Should code charge combinations be applied here? Not automatically. This page is best used pour raw charge takeoff. Apply governing combinations separately if the next step is a design-level check.
Pages associees