Environmental Charge
Roof Snow Charge Calculatrice
Prepare roof snow loading pour rafters, purlins, et roof poutres by turning a ground snow charge into a design area charge, line charge, total member charge, et simple reaction estimate.
Snow Charge Entrees
A typical balanced roof starter avec neutral exposure, thermal, et importance factors.
Snow Charge Summary
Factor summary
| Ground snow charge | 1,20 kN/m^2 |
| 0.7 x Ce x Ct x Is x Cs | 0.7 x 1,00 x 1,00 x 1,00 x 1,00 |
| Total member snow charge | 11,09 kN |
Calculation Basis
Assumptions & Limits
- Ground snow charge et factors remain project hypotheses et do not replace local snow-charge mapping.
- The page prepares charge entrees but does not apply full design combinations or code partial factors automatically.
- Changing tributary width, local peaks, or an uncertain charge path require a more detailed model.
Reference Basis
Reference Snow Setups
| Best use | Roof snow load preparation before rafter, purlin, or beam checks |
| Primary output | Design snow load in kN/m^2 and converted line load in kN/m |
| Typical handoff | Area-load conversion, beam solver, roof member deflection checks |
| Model scope | Balanced snow preparation; drifting, sliding snow, and local accumulation are not automated |
Notes techniques
- Use the governing ground snow charge et factors from the project code basis or local authority data.
- The slope factor is explicit because roof angle, surface type, et snow retention hypotheses can change the final charge significantly.
- Drift charges at steps, parapets, valleys, et adjacent higher roofs can govern roof members et should be checked separately.
Calculation Method
- Flat roof snow: p_f = 0.7 C_e C_t I_s p_g. The calculatrice uses a transparent ASCE-style factor structure pour preliminaire balanced snow charge preparation.
- Design snow charge: p_s = C_s p_f. The roof slope factor adjusts the balanced flat-roof snow charge.
- Line charge: w = p_s x b_tr. The design area charge is converted into poutre line charge through tributary width.
Questions frequentes
- Can this page find the ground snow charge from an address? No. Enter the ground snow charge from the governing map, local authority data, or project design basis, then use this page pour transparent factor conversion.
- Does this include snow drift charges? No. Drift, sliding, valley, et local accumulation cases need separate project-specific checks because they depend on roof geometry et surrounding obstructions.
- Why convert snow charge into kN/m? Most poutre et purlin checks need a line charge. Tributary width turns the roof area charge into the member entree used by the poutre solveur.
Pages associees