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ASCE 7-22 Load Combinations

LRFD combinations (§2.3.1) · ASD combinations (§2.4.1) · Dead, live, roof live, snow, wind, earthquake · Governing combination highlighted

Characteristic (Unfactored) Load Values

D — Dead kip or kip/ft

L — Live

Lr — Roof live

S — Snow

W — Wind

R — Rain

E_h — Horizontal seismic

E_v — Vertical seismic 0.2·S_DS·D (§12.4.2.2)

ASCE 7 edition

LRFD Combinations — §2.3.1 + §2.3.6

Combination	Ref	Result	Status

Governing LRFD—

ASD Combinations — §2.4.1 + §2.4.5

Combination	Ref	Result	Status

Governing ASD—

Code References

ASCE 7-22Snow is a strength-level load: LRFD 1.0S (principal), 0.3S (companion), 0.15S with seismic; ASD 0.7S, 0.525S, and 0.1S with seismic (§2.4.5). Sources: ICC, Demystifying Loads — 2024 IBC / ASCE 7-22; ASCE 7-22 §2.4.5; S. K. Ghosh Associates, Significant Changes in ASCE 7-22.

ASCE 7-16LRFD 1.6(Lr or S or R), 0.5(Lr or S or R), 0.2S with seismic; ASD (Lr or S or R), 0.75(…), 0.75S with seismic. Seismic combinations in §2.3.6 / §2.4.5 with E = f(E_v, E_h).

ScopeLoads are same-sign load effects; the most unfavourable of each "or" group is used. Not included: tornado (W_T), flood, ice, soil (H), fluid (F), self-straining (T) and overstrength (E_mh) combinations; the 0.5L exception for L₀ ≤ 100 psf is not applied (conservative). Calculations: engine/asce7-combos.js (tested).

IBC 2024 §1605IBC references ASCE 7-22 load combinations directly.

ASCE 7-22 ·

Seismic ELF →

Preliminary calculation tool. Load values must be determined per ASCE 7-22 Chapters 3–31. Final design requires review by a licensed PE.